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• Linux Mint 13 is not booting on dual boot computer

  - by Brian

  thanks in advance for your time. I have 2 hard drives in my computer a 300 GB drive which is my primary drive for windows 7 and a 1.5 TB drive that I'd used for storage. When I got it I partitioned 500 GB for use in Linux. So, I created a bootable USB and clicked the "Install by Current Operating System" option from Mint. It installed it to the free 500 GB like I'd hoped it would. Now, I can't get it to boot though. I've tried using EasyBCD to create the boot entry and it hangs on a black screen. Thanks. EDIT @ Ryhuk It presents a menu with two options 1) Windows and 2) Mint. This was a menu I created with easyBCD. When I select option 1 it boots to windows fine. When I select option 2 it hangs on a black screen with just a white bar flashing (Can't remember what its called, it marks the current cursor location on a text field) and won't respond to any key presses but alt ctrl del.

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• Improving IO with FlashCache

  - by Devator

  I have a server with 2 HDD's (2x 1 TB), running in RAID 1 (SW-RAID). I want to improve IO performance by using flashcache. There are running KVM virtual machines on it, using LVM. Regarding this, I have the following questions: Will this even work? flashcache works for block devices, however these are all virtual machines with their own setup. How much would I expect to increase performance? Most virtual machines run websites and some host games. How big does the SSD needs to be? Would having a bigger SSD increase performance since it's able to cache more files? What happens if the SSD dies? Would flashcache retrieve files from the traditional HDD and I could simply replace the SSD? How much faster would writeback be in comparison with writethrough and writearound? I have no access to a test system unfortunately, so could I install flashcache on a live server without unmounting the the disks? I found a great tutorial here which I would be using.

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• How to configure VirtualBox server for performance at home

  - by BluJai

  I currently have two physical Ubuntu Server 10.10 servers at home: one serves as our firewall/router/DHCP/VPN server and the other performs double-duty as a file server and a VirtualBox host for an Ubuntu Desktop 10.10 machine which I use from remote connections (via NoMachine) for many thin-client purposes which are irrelevant to my question. What I'd like to accomplish is to consolidate the two physical machines into one which is a dedicated VirtualBox host (most likely running Ubuntu Server 10.10). Note that I'd like to stick with VirtualBox (if possible) because I'm most comfortable with it and use it on a daily basis at both home and work. Specifically, I plan to have one VM set up as file server, another as the firewall/router/DHCP/VPN (or possibly split those a bit) and a third, which is the only current VM (already VirtualBox), which is the thin-client host. My question comes down to performance and/or recommendations about the file server VM. The file server hosts about 6 terabytes of data across 4 drives. What I'd like to do is use raw disk access from the VM directly to the existing disks. However, I'm curious what performance advantage/disadvantage that would have as compared to using shared folders from the VM host and basically just have the whole drive served as a shared folder to the VM which would then serve it to the other machines on the network. I don't know if virtual disks would even work in this scenario and I certainly wouldn't want a drive to be filled with just a single file which is 1.5 TB (disk image). To add understanding of context, but not to get additional advice, I want to virtualize these machines because I intend to regularly use the snapshot capabilities of VirtualBox for the system disks (which will be virtual drives) of the VMs and I have some physical space/power needs to address (as I mentioned, this is at home).

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• How to configure VirtualBox server for performance at home

  - by BluJai

  I currently have two physical Ubuntu Server 10.10 servers at home: one serves as our firewall/router/DHCP/VPN server and the other performs double-duty as a file server and a VirtualBox host for an Ubuntu Desktop 10.10 machine which I use from remote connections (via NoMachine) for many thin-client purposes which are irrelevant to my question. What I'd like to accomplish is to consolidate the two physical machines into one which is a dedicated VirtualBox host (most likely running Ubuntu Server 10.10). Note that I'd like to stick with VirtualBox (if possible) because I'm most comfortable with it and use it on a daily basis at both home and work. Specifically, I plan to have one VM set up as file server, another as the firewall/router/DHCP/VPN (or possibly split those a bit) and a third, which is the only current VM (already VirtualBox), which is the thin-client host. My question comes down to performance and/or recommendations about the file server VM. The file server hosts about 6 terabytes of data across 4 drives. What I'd like to do is use raw disk access from the VM directly to the existing disks. However, I'm curious what performance advantage/disadvantage that would have as compared to using shared folders from the VM host and basically just have the whole drive served as a shared folder to the VM which would then serve it to the other machines on the network. I don't know if virtual disks would even work in this scenario and I certainly wouldn't want a drive to be filled with just a single file which is 1.5 TB (disk image). To add understanding of context, but not to get additional advice, I want to virtualize these machines because I intend to regularly use the snapshot capabilities of VirtualBox for the system disks (which will be virtual drives) of the VMs and I have some physical space/power needs to address (as I mentioned, this is at home).

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• Exchange Online SMTP Not Working With Any Email Client

  - by emre nevayeshirazi

  I am trying to switch our company mail server to exchange online. I have successfully added my domain and users and can send and receive mails through Outlook Web App. I can also send and receive if I configure my Outlook 2013 client using Exchange protocol. However, some folks in company are using Thunderbird and some old Outlook Clients. For those, I tried to connect to Exchange via IMAP/SMTP. This is what I use, For incoming, IMAP / Port : 993 with SSL / Host : outlook.office365.com For outgoing, SMTP / Port : 589 with TSL / Host : smtp.office365.com I can receive emails, however I could not be able to send emails. I keep getting An error occurred while sending mail. The mail server responded: 4.3.2 Service not active. Please verify that your email address is correct in your Mail preferences and try again. My username and password are correct, I am using my mail address as my username to mailbox. I also tried sending mail via C# application which was working for outlook.com and gmail.com SMTP settings. It also fails to send emails and returns the same error code. I thought TB and other old clients such as Office 2003 might not support Exc. Online so I tried same settings in Office 2013. It successfully connected my mailbox when checking for configuration but failed in sending test message and returned the same error code. Configuration for incoming and outgoing mailbox are taken from here. They are also available on Office 365 user page and they are same. What could be the reason for error ?

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• Backup hardware and strategy on distributed Windows Server 2008 network

  - by CesarGon

  This question is a follow up to this. We have a Windows Server 2008 R2 domain over a network that spans two different buildings, linked by a 100-Mbps point-to-point line. Over 60 users work in the organisation. We are planning to use DFS folders and DFS replication for file serving across the organisation. The estimated data volume is over 2 TB, and will grow at approximately 20% annually. The idea is to set up a DFS file server in each building and use DFS so that all the contents stay replicated over the 100-Mbps link. We are now considering backup hardware and strategies. We are Dell customers and, after browsing the online Dell catalogue, I can see a number of backup hardware options. My main doubts are the following: Would you go for a tape library, disk backup, or are there other options worth considering? Would you perform batch backups (i.e. nightly) or would you use continuous backup (i.e. while users are working)? Would you use a dedicated backup server to which the tape library (or any other backup device) is attached, or is there any other alternative way of doing things? My experience with backup hardware and overall setup is limited, so I appreciate any good piece of advice that you may have. Thanks.

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• Do registry issues with Win7 persist through a recovery from a system image?

  - by user59089

  So I need a bit of advice, please; here's my situation: I have 1) a system image on an a brand new external 1 TB SATA drive, that I managed to successfully capture before my 2) primary system drive went down. I realize this is a fairly simple matter of buying a new primary drive and performing the recovery to the fresh disk...however, the issue is that I believe Win7 was also having some significant issues of its own--basically, Update unable to install updates, and Backup continually ditching the auto backup schedule. I'd been trying to address those issues when my system was still working, but it's been so fruitless, I'm convinced a Win7 re-install would be best, and now I'm concerned that if I was in fact having what I believe are likely registry-related issues before, that these will persist through a recovery--would that likely be correct? I'm mainly worried about recovering my files, so if I did a full recovery from the image, should I be able to then access my individual files, and copy them manually to an external drive, so I can then do a full re-install of Win7? Sory if this seems obvious, but I've never done a recovery before and just trying to make sure there's no red flags with what I have in mind...

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• Windows Home Server installation fails because it can't find the DVD drive anymore

  - by BBlake

  I've got an old Dell Dimension 8300 desktop I decided to convert into a WHS box. I popped in a pair of 1 TB SATA drives, which were recognized fine by the BIOS and the currently installed OS (XP), so I decided to go ahead and install WHS. Near the end of the installation, WHS acts like it can no longer find the DVD drives (either of them, the box has a DVDROM and a DVDRW). The specific error is gives is the "Can't configure storage" error. I've found several forums where people say they get this error if they remove the boot DVD during the installation (at the time of the first reboot). However, I never removed the DVD. After the error, if fails into WHS, so it did mostly install and I can work with WHS. However, it refuses to recognize the network card, video card and while it shows the two DVD drives, any CD/DVD I insert in either drive the system says is corrupted and unreadable, even though none of them are. I've tried several reinstalls both removing and not removing the DVD, but the result is the same regardless. Any other tricks anyone found? If I can't figure this out, maybe I'll just install SBS2008 and fake it up to be similar to WHS with some addin tools. Shouldn't be too hard to create something since WHS is based on SBS2003 anyway.

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• Drobo FS vs Lime Technology unRAID vs FreeNAS

  - by elluca

  I already decided to by a drobo fs until I just found these two tests: http://www.digitalversus.com/data-robotics-drobo-fs-p889_9543_487.html http://www.digitalversus.com/lime-technology-unraid-p889_8992_473.html The two cons agains drobo for me: loudness price What disadvantages has the unraid stuff against the drobo fs? Has it also got that ease of use like swapping drives on the go, simply extend capacity by plugging in new drives, notify me of drive errors, disk failure protection, dynamic space of "partitions", better/worse effective capacity, etc. Which is more secure? Am I able to simply replace a bad drive with a new one on unraid? What happens if my pc fails? Lets say the cpu overheats. Since I have a complete pc which is going to be replaced, I only have to pay the software to use unraid. I am going to use my nas for: music library (how well does it integrate with iTunes? ) picture library movie library development (i need to be able to be to use time machine) I am going to use this nas with a MacBook pro. My current disks: 2x 500Gb 1x 1.5Tb 1x 2Tb On a drobo fs I would have 2.26 Tb of space. What would it be on unraid? Is FreeNAS also an alternative?

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• Home server hard drive: 186k start-stop cycles in 325 days?

  - by j-g-faustus

  I set up a home server about a year ago, using Ubuntu server (10.04 LTS at the moment), four disks in RAID 5 for storage (WD Green 1.5 TB) and a laptop drive for the OS. Today the output of smartctl, a command line utility for checking the SMART attributes of a hard drive, tells me that the primary OS drive has had no less than 186,000 start-stop cycles in 325 days and may be nearing the end of its lifespan. The smartctl output is in "normalized values", in this case a number between 200 and 000, where 200 is "brand new" and 000 means "worn out". My disk gets 001. So I wonder what happened: 186k start/stop cycles in 7820 hours is about one start/stop per 2.5 minutes around the clock. This seems somewhat excessive for a computer that sees actual use once or twice per day. (The RAID disks are normal, averaging to one start/stop per day, as expected.) Does anyone have similar experiences, or pointers to what might be the issue here? Specifically I'd like to know Why the massive start/stop count? Do I have some sort of configuration issue? Could there be a background service that is causing trouble? Could having a laptop disk as the OS drive be part of the problem? Can anyone confirm or deny this? Here is the /etc/hdparm.conf configuration /dev/sda { apm = 127 spindown_time = 120 } and the most relevant parts of smartctl --attributes /dev/sda: smartctl version 5.38 [x86_64-unknown-linux-gnu] Copyright (C) 2002-8 Bruce Allen === START OF READ SMART DATA SECTION === SMART Attributes Data Structure revision number: 16 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x002f 200 200 051 Pre-fail Always - 0 4 Start_Stop_Count 0x0032 001 001 000 Old_age Always - 185875 9 Power_On_Hours 0x0032 090 090 000 Old_age Always - 7820 12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 109 193 Load_Cycle_Count 0x0032 118 118 000 Old_age Always - 246833 194 Temperature_Celsius 0x0022 107 098 000 Old_age Always - 36 As I generally prefer my drives to last more than a year, any advice is appreciated.

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• Reduce power consumption of gaming computer while idle

  - by White Phoenix

  This is my current build: EVGA X58 (first generation) motherboard Intel i7 965 clocked @ 3.3 Ghz 3x DDR3-1600 Corsair RAM at stock timings and voltages Corsair AX750 80 Plus Gold PSU 1 Optical Drive 1 Seagate 7200.10 500 GB drive 2x Western Digital Caviar Black 1 TB drives OCZ Vertex 1 60 GB EVGA GTX 460 oc'd at 800/1600/1850 Antec 1200 case HT-Omega Striker 7.1 Sound Card Windows 7 32-bit Professional (PAE Enabled) I've already seen this post Reduce power use on computer and this post How do I lower power consumption of my computer and while useful, I'm looking for answers specific to my build and OS. I'm pretty sure this build is a energy-intensive build by default, but I want to try to reduce the amount of energy my build uses when I leave it idle (when I go to bed or go out, etc). The first requirement for this machine is that I need to leave it on, so I cannot turn it off while it's being unused. I run it as a file server for personal reasons and I also leave it on in case people leave me messages on various IM services and chat clients (IRC, MSN, Steam, XFire, Pidgin, etc). I'm also unable to replace the parts in my computer with a cheaper "greener" part. What are some ways to minimize the amount of power the machine uses? I'm already using a high efficiency power supply (80 Plus Gold), but I imagine there's other things that can be done in the BIOS and Windows' power settings to reduce power usage while I'm not using the computer. From what I can tell, I can't use Sleep since that'll disable network access (whole reason why I leave the computer on in the first place). I already turn off my monitor when it's not in use. I enabled Intel SpeedStep within the BIOS (I know, I have a 965 and why am I enabling SpeedStep?) Should I bring the graphics card back to stock speeds and lower the clock on the processor even more? Main reason why I'm asking is I think this computer alone is the reason why my power bill is high, so I want to reduce its consumption to as low as possible without having to shut the thing down.

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• Creating a tar file with checksums included

  - by wazoox

  Here's my problem : I need to archive to tar files a lot ( up to 60 TB) of big files (usually 30 to 40 GB each). I would like to make checksums ( md5, sha1, whatever) of these files before archiving; however not reading every file twice (once for checksumming, twice for tar'ing) is more or less a necessity to achieve a very high archiving performance (LTO-4 wants 120 MB/s sustained, and the backup window is limited). So I'd need some way to read a file, feeding a checksumming tool on one side, and building a tar to tape on the other side, something along : tar cf - files | tee tarfile.tar | md5sum - Except that I don't want the checksum of the whole archive (this sample shell code does just this) but a checksum for each individual file in the archive. I've studied GNU tar, Pax, Star options. I've looked at the source from Archive::Tar. I see no obvious way to achieve this. It looks like I'll have to hand-build something in C or similar to achieve what I need. Perl/Python/etc simply won't cut it performance-wise, and the various tar programs miss the necessary "plugin architecture". Does anyone know of any existing solution to this before I start code-churning ?

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• Formula to calculate probability of unrecoverable read error during RAID rebuild

  - by OlafM

  I need to compare the reliability of different RAID systems with either consumer or enterprise drives. The formula to have the probability of success of a rebuild, ignoring mechanical problems, is simple: error_probability = 1 - (1-per_bit_error_rate)^bit_read and with 3 TB drives I get 38% probability to experience an URE (unrecoverable read error) for a 2+1 disks RAID5 (4.7% for enterprise drives) 21% for a RAID1 (2.4% for enterprise drives) 51% probability of error during recovery for the 3+1 RAID5 often used by users of SOHO products like Synologys. Most people don't know about this. Calculating the error for single disk tolerance is easy, my question concerns systems tolerant to multiple disks failures (RAID6/Z2, RAIDZ3 and RAID1 with multiple disks). If only the first disk is used for rebuild and the second one is read again from the beginning in case or an URE, then the error probability is the one calculated above squared (14.5% for consumer RAID5 2+1, 4.5% for consumer RAID1 1+2). However, I suppose (at least in ZFS that has full checksums!) that the second parity/available disk is read only where needed, meaning that only few sectors are needed: how many UREs can possibly happen in the first disk? not many, otherwise the error probability for single-disk tolerance systems would skyrocket even more than I calculated. If I'm correct, a second parity disk would practically lower the risk to extremely low values. Am I correct?

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• Photoshop CS6 Corrupted File recovery

  - by Ben Franchuk

  Last night I was working on a client application mock-up in photoshop, but was goin to take a break from my work so I saved the .PSD file on my internal HDD and put my computer into stand-by mode once the file had finished saving. Unfortunately my computer crashed while it was entering stand-by and shut itself down (photoshop was still open). I did not boot it again to make sure all my files were ok because they had already been saved, but today once I opened up the file again it was extremely corrupted and also completely un-editable (screenshot bellow). so what im asking is there any way to recover my work, or at least some of it? i have put in a good few days work on this project and would hate to have to restart it. the size of the file is 3070 KB, even though it reads as 712 KB in photoshop. i dont know if these file sizes are larger or either smaller than the original non-corrupted file's size, but considering all the layers in the file i suspect it was larger before it corrupted. im using windows XP professional 32bit SP3. both my OS and said .PSD file are located on the same internal HDD (74.4 GB). i do have an external HDD (1.5 TB) but i primarily only use it for movies music and tv shows. i dont know if it was plugged in t the time of me editing the document last, though, if it means anything. i have tried many image and PSd recovery softwares but none have returned any results that may help recover my work. edit: i tried using a photo reccovery software (odboso Photorecovery) that actually seems to recover the corrupted file in question judging by the size of the file, but i cannot recover it because of the licence fee. knowing that the file is still likely on my HDD, what location might it be located?

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• Postfix not working

  - by user1488723

  A while ago I installed the postfix mail server on my ubuntu 10.04 VPS. At the time it was working good but now it's just stopped working. I was trying to enable SASL authentification and somewhere it must have went really wrong. I've studied the postfix main.cf and done everything in an orderly fashion to ensure that it is nothing wrong. I also have Dovecot installed and configured dovecot.conf to run with Postfix. If I try to do telnet localhost 25 while logged in on the server I just get: Connection closed by foreign host. If I try to do telnet mail.example.com 25 "from the outside" I get: telnet: Unable to connect to remote host: No route to host And when I check the server log after the failed attempts I see this: Jun 28 15:49:31 msv postfix/smtpd[11839]: initializing the server-side TLS engine Jun 28 15:49:31 msv postfix/smtpd[11839]: connect from localhost.localdomain[127.0.0.1] Jun 28 15:49:31 msv postfix/smtpd[11839]: warning: SASL: Connect to /var/spool/postfix/private/auth failed: Connection refused Jun 28 15:49:31 msv postfix/smtpd[11839]: fatal: no SASL authentication mechanisms Jun 28 15:49:32 msv postfix/master[11598]: warning: process /usr/lib/postfix/smtpd pid 11839 exit status 1 Jun 28 15:49:32 msv postfix/master[11598]: warning: /usr/lib/postfix/smtpd: bad command startup -- throttling main.cf file looks like this: smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no append_dot_mydomain = no delay_warning_time = 4h myhostname = mail.example.com alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases mydomain = example.com myorigin = $mydomain mydestination = $mydomain relayhost = mynetworks = 127.0.0.1 mailbox_command = procmail -a "$EXTENSION" mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all smtpd_use_tls = yes smtpd_tls_loglevel = 2 smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem smtpd_sasl_auth_enable = yes smtpd_client_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination smtpd_sender_restrictions = permit_sasl_authenticated, permit_mynetworks smtpd_recipient_restrictions = permit_sasl_authenticated, reject_unauth_destination broken_sasl_auth_clients = yes smtpd_sasl_type = dovecot smtpd_sasl_path = /var/spool/postfix/private/auth smtpd_sasl_security_options = noanonymous Dovecot.conf file looks like this: protocols = imap imaps disable_plaintext_auth = no log_timestamp = "%b %d %H:%M:%S " ssl = yes ssl_cert_file = /etc/postfix/ssl/smtpd.crt ssl_key_file = /etc/postfix/ssl/smtpd.key mail_location = maildir:~/mail mail_access_groups = mail auth_username_chars = abcdefghijklmnopqrstuvwxyz protocol imap { imap_client_workarounds = delay-newmail tb-extra-mailbox-sep } auth default { mechanisms = plain login passdb pam { } userdb passwd { } socket listen { client { path = /var/spool/postfix/private/auth user = postfix group = postfix mode = 0660 } } }

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• Is current SATA 6 gb/s equipment simply unreliable?

  - by korkman

  I have a 45-disk array of Seagate Barracuda 3 TB ST3000DM001 (yes these are desktop drives I'm aware of that) in a Supermicro sc847 JBOD, connected via LSI 9285. I have found a solution for the problem description below by reducing speed via MegaCli -PhySetLinkSpeed -phy0 2 -a0; for i in $(seq 48); do MegaCli -PhySetLinkSpeed -phy${i} 2 -a0; done and rebooting. The question remains: Is this typical for current 6 gb/s equipment? Is this the sad state of SATA storage? Or is some of my equipment (the sff-8088 cables come to mind) bad? The Problem was: Synchronizing HW RAID-6, disks kept offlining. Fetching SMART values reveiled that those which offlined did not increase powered-on hours anymore. That is, their firmware (CC4C) seems to crash. Digging into the matter by switching to Software RAID-6, with the disks passed-through, I got tons of kernel messages scattered across all disks, with 6 gb/s: sd 0:0:9:0: [sdb] Sense Key : No Sense [current] Info fld=0x0 sd 0:0:9:0: [sdb] Add. Sense: No additional sense information And finally, when a disk offlines: megasas: [ 5]waiting for 160 commands to complete ... megasas: [35]waiting for 159 commands to complete ... megasas: [155]waiting for 156 commands to complete ... megaraid_sas: pending commands remain after waiting, will reset adapter. Ugly controller reset here, then minutes later: megaraid_sas: Reset successful. sd 0:0:28:0: Device offlined - not ready after error recovery ... sd 0:0:28:0: [sdu] Unhandled error code sd 0:0:28:0: [sdu] Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK sd 0:0:28:0: [sdu] CDB: Read(10): 28 00 23 21 2f 40 00 00 70 00 sd 0:0:28:0: [sdu] killing request Reduced speed to 3 gb/s like written above, all problems vanished.

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• How to change my W2k8 System Partition?

  - by Chris May

  On my Windows 2008 server, my C: is 1.5 TB, and the partition is marked as: Healthy (Boot, Page File, Active, Crash Dump, Primary Partition) and somehow I ended up with a 2GB D: that is marked as Healthy (System). On this D: drive are only a few MB worth of files (bootmgr, boot folder, bootsect.bak), but all Windows files are on the c:. I've done everything I can to remove the (System) mark. I tried using bcdedit, I tried marking the C:partition as "Active", I tried using bootsect.exe to assign the C: drive as the boot partition. Maybe I didn't do one of those steps correct, but I've tried everything I can. When I got my new Dell Poweredge T710, I didn't bother removing their 2 small drives before I put in my 2 new large drives. So I think when I installed W2k8 Server, maybe dell left some bootable partition on their drives to help me install the OS, but I never used it and just booted right from the install CD. Can anyone help me remove the (System) mark from the D: so I can remove the D: partition and still boot to the C:? I know I could remove the D: drives and reinstall windows, but I'm trying to avoid a total reinstall.

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• Which is the fastest way to move 1Petabyte from one storage to a new one?

  - by marc.riera

  First of all, thanks for reading, and sorry for asking something related to my job. I understand that this is something that I should solve by myself but as you will see its something a bit difficult. A small description: Now Storage = 1PB using DDN S2A9900 storage for the OSTs, 4 OSS , 10 GigE network. (lustre 1.6) 100 compute nodes with 2x Infiniband 1 infiniband switch with 36 ports After Storage = Previous storage + another 1PB using DDN S2A 990 or LSI E5400 (still to decide) (lustre 2.0) 8 OSS , 10GigE network 100 compute nodes with 2x Infiniband Previous experience: transfered 120 TB in less than 3 days using following command: tar -C /old --record-size 2048 -b 2048 -cf - dir | tar -C /new --record-size 2048 -b 2048 -xvf - 2>&1 | tee /tmp/dir.log So , big problem here, using big mathematical equations I conclude that we are going to need 1 month to transfer the data from one side to the new one. During this time the researchers will need to step back, and I'm personally not happy with this. I'm telling you that we have infiniband connections because I think that may be there is a chance to use it to transfer the data using 18 compute nodes (18 * 2 IB = 36 ports) to transfer the data from one storage to the other. I'm trying to figure out if the IB switch will handle all the traffic but in case it just burn up will go faster than using 10GigE. Also, having lustre 1.6 and 2.0 agents on same server works quite well, with this there is no need to go by 1.8 to upgrade the metadata servers with two steps. Any ideas? Many thanks Note 1: Zoredache, we can divide it in two blocks (A)600Tb and (B)400Tb. The idea is to move (A) to new storage which is lustre2.0 formated, then format where (A) was with lustre2.0 and move (B) to this lustre2.0 block and extend with the space where (B) was. This way we will end with (A) and (B) on separate filesystems, with 1PB each.

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• How to discover true identity of hard disk?

  - by F21

  I have 2 fake external hard drives that claim to have a storage capacity of 2TB. I pulled the enclosure apart and the hard drives seems to be refurbished ones with their labels replaced as Barracuda LP 2000 GB labels (the serial numbers on both labels are the same). Interestingly, one of the drives have 160G written on it with pencil. However, the counterfeiters seem to have done something to the firmware, because CrystalDiskInfo reports them as 2TB ST2000DL003 drives. I then delete the 1.81 TB partition in Windows disk management and tried to create a new one and format it. Once I get to this point, the drives would make some noise that is common to dying drives. I am not interested in using these drives for production, but I am interested in finding the true identity (manufacturer/serial number/model number, etc) and restoring it to their factory defaults with the right capacity. Can this be done without any special equipment? This would be an interesting learning exercise. Some pictures of the drives in question: Here are the screens from CrystalDiskInfo: Note the serial numbers are the same (these are 2 different drives!). How is this done? Did they have to tamper with the controller board? I would assume that changing the firmware doesn't change the serial number at all.

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• Feasibility of Windows Server 2008 DFS replication over WAN link

  - by CesarGon

  We have just set up a WAN link that connects two buildings in our organisation. The link is provided by a 100-Mbps point to point line. We have a Windows Server 2008 R2 domain controller on each side of the link. Now we are planning to set up DFS for file services across the organisation. The estimated data volume is over 2 TB, and will grow at approximately 20% annually. My idea is to set up a file server in each building and install DFS so that all the contents stay replicated over the 100-Mbps link. I hope that this will ensure that any user will be directed to the closest (and fastest) server when requesting a file from the DFS folders. My concern is whether a 100-Mbps WAN link is good enough to guarantee DFS replication. I've no experience with DFS, so any solid advice is welcome. The line is reliable (i.e. it doesn't crash often) and our data transfer tests show that a 5 MB/sec transfer rate is easily achieved. This is approximately 40% of the nominal bandwidth. I am also concerned about the latency. I mean, how long will users need to wait to see one change on one side of the link after the change has been made on the other side. My questions are: Is this link between networks a reliable infrastructure on which to set up DFS replication? What latency times would be typical (seconds, minutes, hours, days)? Would you recommend that we go for DFS in this scenario, or is there a better alternative? Many thanks.

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• On what should i not be pennywise buying a machine for SqlServer 2008?

  - by Michel

  Hi, i'm going to do a project for a client and i'll be hosting the database server myself. Normally it would be on my dev machine, but there will also be data pushed into it during developing and testing, so i would like to setup a dedicated test sql server. But, as you might guess, i can't afford to go to Dell and buy one mega 16 core 16 GIG 10 TB raid 5 machine (wow, that sounds cool) So i have to save the money somewhere... the hardware only has to live for a year (longer is nice of course), and the sql server won't be hit too hard: i guess the average server will only see it as a cough once in a while. But i do want the machine to be a bit performant: if it does get some data, it must be a bit responsive. So my question is were can i leave out the expensive parts: is 2 GB enough, or must i take 4GB, is an average processor enough or should it be a top of the bill? Is Sql server a large resource user or is a simple desktop pc good enough? It wil run on win2008 by the way.

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• Decyphering Seagate drive model numbers?

  - by Stefan Lasiewski

  I'm comparing Seagate's Enterprise and Desktop drives for a variety of old and new servers. These servers come from different generations, so options like size (73GB, 2TB) and interface (SATA vs SAS 3.0Gbps vs SAS 6Gbps vs SCSI Ultra320) are widely variable. I'm trying to compare the sizes, speeds and interfaces, but I'm getting thrown off by different models. Also, their website is not the best. Does anyone know of a documented explanation of the Seagate model numbers? And is there a single spreadsheet which compares the features for all drives (or all 'Enterprise' drives?). Seagate drives have model numbers like this: Model ST3600057SS 6-Gb/s SAS 600 GB None at Cheetah® 15K Hard Drives Model ST373455LW Ultra320 SCSI 73.4 GB 68-Pin LW at Cheetah® 15K Hard Drives Model ST32000644NS SATA 3Gb/s 2 TB None at Constellation™ ES Hard Drives Model ST973452SS 6-Gb/s SAS 73 GB None Savvio® 15K Hard Drives Model ST9200011FS SATA 3Gb/s 200 GB Pulsar™ Solid State Drives I understand the model numbers read something like this: ST - SOMETHING1 - SIZE - SOMETHING2 - INTERFACE Where the fields mean something like this: ST : For 'Seagate'? 'Seagate Technoligies'? SOMETHING1 - This field has number, but I'm not sure what that represents. SIZE - Size in Gigabytes. This is a number like '73' or '300' or '2000' SOMETHING2 - This field also has a number, but I'm not sure what it means. INTERFACE - This field seems to indicate the Interface. 'SS' means SAS, 'FC' means Fibre Channel, but I don't see how to distinguish between 6Gbps SAS and 3Gbps SAS, or different SATA or FC speeds. I don't see a field which indicates the RPM (15K , 10K, 7.2K) etc. Is this part of the model number?

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• Seagate 3TB ST3000DM001 hard drive not recognized by Linux, causes fdisk to hang

  - by MountainX

  I'm running Kubuntu 12.04. I have a brand new, never used Seagate 3TB ST3000DM001 hard drive. It's an internal drive. I installed it in a USB enclosure. When I connect it to my PC, nothing happens automatically. When I run sudo fdisk -l, fdisk hangs (without reporting this drive) until I disconnect this drive from the USB port. blkid won't report it either. I tried connecting it to both USB 2.0 and USB 3.0 ports on my PC. I got the same result either way. I tried two different USB enclosures with the same result. If I take the same drive, same enclosure and connect it to a Windows 7 laptop, it is recognized automatically as a USB mass storage device. I want to format the drive (probably ext4) and copy files to it. I have another drive, also in a USB enclosure, that is connected via USB 3.0 to this PC and it works fine. It's a 2.0 TB Samsung HDD. I plan to copy files from the 2TB to the 3TB drive, once I get this issue resolved. My motherboard is an Asus Asus P8B WS LGA1155/ Intel C206/ Quad CrossFireX/ SATA3&USB3.0/ A&2GbE/ ATX. What is the resolution?

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• SQL Server Offsite Backups

  - by Eric Maibach

  We have about !TB of SQL Server databases, and these databases generate about 200GB of data changes each day. Up to this point we have been doing Weekly full backups, daily diff backups, and hourly transaction log backups. The full and diff backups are backed up to tape and taken offsite each day. We have been trying to move away from tapes, and our IT department purchased a Barracuda Backup device that backups up data and then sends it offsite using our internet connection. I have been trying to get this to work for our SQL Server backups, and have ran into a number of problems. I normally like to just use SQL Server to perform backups instead of trying to use a agent, so that is what I tried first. However the Barracuda device was not able to dedup these files very well, so it ended up being to much data to try to send offsite and to archive. I then tried installing the Barracuda agent and using it to backup the SQL Server databases. However the problem I am having there is that on some of the database servers I also have files that need backed up, and I cannot find a way to create seperate backup schedules for the file backups and the SQL Server backups. Barracuda only does full or transaction log backups. So if I want to do hourly transaction log backups I end up doing a file system backup every hour (which is not good), or if I only schedule the backups to run once a night I either have to do a full backup every night, or only do a transaction backup once a day. None of these scenarios are good options. My question is, how is everyone else getting their large SQL Server database backups offsite. Are you just using tape, or have you found a offsite backup device that works well? Is anybody else using Barracuda to backup their SQL Server databases? If you do, then how do you have it setup?

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• VMWare Raw Device Mapping Not Working

  - by George H. Lenzer

  While I'm waiting for VMWare support to get back to me, I thought I'd ask here. I have a 400 gig LUN presented from a fiber channel SAN to my VMWare host. It's legacy from another virtualization platform and I need to keep it as is to avoid a long period of downtime. I formatted my VMFS3 datastore with 4 meg blocks to allow up to 1 TB disks. Then I tried adding my 400 gig disk as a raw device in physical compatibility mode. I get the error: "File is larger than the maximum size supported by datastore 'Base Test'. [Base Test]VMTEST01/VMTEST01_2.vmdk Originally I had the VMFS datastore formatted with 1 meg blocks which was the cause of this problem since the largest disk allowed would be 256 gigs. But I deleted the data store and then reformatted with 4 megs blocks. I've also tried using virtual compatibility mode for the raw device but it still fails. Does anyone have any suggestions? I've been waiting for a little over a week for VMWare, but that's fine because I'm not yet a paying customer. I'm still in the eval phase.

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