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• grow/shrink a zfs RAIDZ

  - by c2h2

  I'm going to build a freenas server, would like to make sure what I can do with such magical and advanced zfs. If I have 5 * 3TB disks in RAIDZ (12TB storage in total), now I am trying to add another 2 * 3TB disks to this existing array. Q: Am I able to do it without affect/touch any existing data on RAIDZ volume? What about take away some existing disk? say take away 1 disk out of the 5 disks, assuming only very small portion of data exists on the raidz.

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• SQL Server 2008 Hardware Recommendation;

  - by Jay

  Hi,I work for a large fortune 500 company. We have several SQL 2005 Servers running on DELL Poweredge 2950 with 8 GB RAM and 4 CPU's. Storage is DMX RAID 10. We are in the process of migrating to sql 2008. We are planning on consolidating multiple sql 2005 into single SQL 2008 Server.If anyone can suggest hardware I would appreciate. We have looked at DELL R710, I was wondering if there are other servers that are good for running SQL 2008. Thanks

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• How to use qcow2 disk image in Linux?

  - by sauparna

  I have a large qcow2 formatted disk image, which I use as storage. Often I need to move data to and from this disk image. I mount the disk using the qemu-nbd tool as follows: modprobe nbd max_part=63 qemu-nbd -c /dev/nbd0 /host/disk100G.img mount /dev/nbd0p1 /home/rup/disk But disk access fails every now and then in the midst of some I/O operation with an "Input/output error". At that point I have to manually unmount the disk and re-mount it so that I can run the program again: qemu-nbd -d /dev/nbd0 umount joborkhaki/ What could be the reason for this? Is there a better tool that I can use to maintain a qcow2 disk image?

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• Nexenta/OpenSolaris filer kernel panic/crash

  - by ewwhite

  I've an x4540 Sun storage server running NexentaStor Enterprise. It's serving NFS over 10GbE CX4 for several VMWare vSphere hosts. There are 30 virtual machines running. For the past few weeks, I've had random crashes spaced 10-14 days apart. This system used to open OpenSolaris and was stable in that arrangement. The crashes trigger the automated system recovery feature on the hardware, forcing a hard system reset. Here's the output from mdb debugger: panic[cpu5]/thread=ffffff003fefbc60: Deadlock: cycle in blocking chain ffffff003fefb570 genunix:turnstile_block+795 () ffffff003fefb5d0 unix:mutex_vector_enter+261 () ffffff003fefb630 zfs:dbuf_find+5d () ffffff003fefb6c0 zfs:dbuf_hold_impl+59 () ffffff003fefb700 zfs:dbuf_hold+2e () ffffff003fefb780 zfs:dmu_buf_hold+8e () ffffff003fefb820 zfs:zap_lockdir+6d () ffffff003fefb8b0 zfs:zap_update+5b () ffffff003fefb930 zfs:zap_increment+9b () ffffff003fefb9b0 zfs:zap_increment_int+68 () ffffff003fefba10 zfs:do_userquota_update+8a () ffffff003fefba70 zfs:dmu_objset_do_userquota_updates+de () ffffff003fefbaf0 zfs:dsl_pool_sync+112 () ffffff003fefbba0 zfs:spa_sync+37b () ffffff003fefbc40 zfs:txg_sync_thread+247 () ffffff003fefbc50 unix:thread_start+8 () Any ideas what this means?

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• mysql spitting lots of "table marked as crashed" errors

  - by Shawn

  Hi, I have a mysql server(version: 5.5.3-m3-log Source distribution ) and it keeps showing lots of 110214 3:01:48 [ERROR] /usr/local/mysql/libexec/mysqld: Table './mydb/tablename' is marked as crashed and should be repaired 110214 3:01:48 [Warning] Checking table: './mydb/tablename' I'm wondering what can be the possible casues and how to fix it. Here is a full list mysql configuration : connect_errors = 6000 table_cache = 614 external-locking = FALSE max_allowed_packet = 32M sort_buffer_size = 2G max_length_for_sort_data = 2G join_buffer_size = 256M thread_cache_size = 300 #thread_concurrency = 8 query_cache_size = 512M query_cache_limit = 2M query_cache_min_res_unit = 2k default-storage-engine = MyISAM thread_stack = 192K transaction_isolation = READ-COMMITTED tmp_table_size = 246M max_heap_table_size = 246M long_query_time = 3 log-slave-updates = 1 log-bin = /data/mysql/3306/binlog/binlog binlog_cache_size = 4M binlog_format = MIXED max_binlog_cache_size = 8M max_binlog_si ze = 1G relay-log-index = /data/mysql/3306/relaylog/relaylog relay-log-info-file = /data/mysql/3306/relaylog/relaylog relay-log = /data/mysql/3306/relaylog/relaylog expire_logs_days = 30 key_buffer_size = 1G read_buffer_size = 1M read_rnd_buffer_size = 16M bulk_insert_buffer_size = 64M myisam_sort_buffer_size = 2G myisam_max_sort_file_size = 5G myisam_repair_threads = 1 max_binlog_size = 1G interactive_timeout = 64 wait_timeout = 64 skip-name-resolve slave-skip-errors = 1032,1062,126,1114,1146,1048,1396 The box is running on centos-5.5. Thanks for your help.

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• Best way to fix security problems caused by windows updates?

  - by Chris Lively

  I have a laptop running Windows 7 32-bit. Last nights security updates caused my logitech mouse to stop working (specifically, it caused several USB ports to stop altogether). After reviewing the system event log I found that the IPBusEnum component was failing due to an activation security error. A little more research and I found that this was caused by the TrustedInstaller replacing the security permissions on those keys and generally mucking them up. To fix this I had to open regedit, take ownership of ALL the keys related to IPBusEnum and force it to use the inherited permissions from the tree. Is there a better way to fix this when MS screws up the updates? I would hate to have to walk around to a number of machines and manually fix the registry key security settings.

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• Oracle on NFS vmdk beats native NFS!?

  - by fletch00

  Hi, my colleagues are pursuing this with Netapp and Oracle - but I thought I'd post here on the off chance someone else has seen this We have a RedHat 5 VM (fully up2date) running Oracle 11i with data disks mounted via the VM's linux kernel NFS using Oracle's recommended mount options and the performance is very inconsistent (Querys that should take < 2 seconds sometimes take 60 seconds) Funny thing is we can run the same queries perfectly consistently < 2 seconds on a VMDK residing on SAME NetApp NFS datastore! Makes me wish Oracle and NetApp collaborated as closely as VMware and NetApp did on the Virtual Storage Console we used to perfectly set the NFS options and keep them in compliance... We have tried a few Linux NFS options others have posted and not seen improvement so far. We are now creating VMDK's for the VM to replace the Linux NFS mounted and workaround the issue as our developers need consistent performance ASAP.

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• Robocopy to a drive connected to a wlan router fails

  - by Ville Koskinen

  I have a wireless router and an USB hard drive connected to it. Basic file access on the command line and Explorer works flawlessly after having set up some options on the router and mapping to some folders with net use k: \\ROUTER\Folder1 /user:MYLAPTOP\Me password /persistent:yes net use n: \\ROUTER\Folder2 /user:MYLAPTOP\Me password /persistent:yes Robocopy (and using SyncToy for that matter) to a network drive however fails: robocopy c:\Files k:\Backup /MIR /Z gives There is not enough space on the disk. 2010/01/05 09:52:11 ERROR 112 (0x00000070) Accessing Destination Directory N:\ Waiting 30 seconds... The error message is misleading: there is plenty of space on the disk and the folders I'm copying are small. The router is an ASUS WL-500gp with a standard firmware. I'd appreciate if someone would be able to explain what is causing the problem and, if possible, how to fix it.

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• Find and free disk space that is unused but unavailable (due to file system error, etc.)

  - by Voyagerfan5761

  Sometimes I get the feeling that if an app such as μTorrent allocates files on my FAT32-formatted flash drive, but then is killed or crashes (as happens more than a few times a month), that space just disappears from my file system. Whether or not that is the case, sometimes I do get a chill from wondering if I've lost hundreds of MB in available storage due to carelessness or malfunctions. Checking my disk with WinDirStat just makes it worse, because I see the huge "<Unknown>" item at the disk root staring at me, eating up well over a gigabyte. It might be FS inefficiency (due to 32 or 64kb sector/cluster size and a lot of tiny files) or it might be a glitch... Is there a tool I can download and run to check my file system and make sure that there aren't any unused allocated blocks on the disk? I want to make sure I'm not losing any disk space to I/O errors, etc.

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• Why did my Cisco router hang?

  - by Mike Pennington

  We have a Cisco 1841 in our storage IDF that was originally running a 12.4(1) IP-BASE image; I wanted to upgrade to an advancedservicesk9-mz image, but the flash did not have enough space, so I deleted the running image. Later I tried inserting a larger CF from a Catalyst4500, which crashed the 1841 router (now without a bootable image). Using another 1800 series router, I loaded the 12.4(25g) advancedservicesk9 image and verified the image checksums. I set the confreg to 0x2102 from rommon and booted the new image; however the 1841 now hangs indefinitely after printing the IOS export control banner. I have tried four other images, all with the same results. What is wrong with this router? UPDATE 1: I tried loading images from a FAT16-formatted USB, but this didn't work either. I also tried tftpdnld from rommon, but got a get_mac_address(): Search T_IDPROM_MACADDR (0xc3) failed Illegal MAC address. error and the file would not load.

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• Fail rate of EBS snapshots and AMIs?

  - by user784637

  According to Amazon the fail rate of EBS volumes is: As an example, volumes that operate with 20 GB or less of modified data since their most recent Amazon EBS snapshot can expect an annual failure rate (AFR) of between 0.1% – 0.5%, where failure refers to a complete loss of the volume http://aws.amazon.com/ebs/ However, I was curious to know the fail rate of EBS snapshots and private AMIs that a system admin would take. Since the EBS snapshots and AMIs are stored in Amazon s3, is it safe to assume that the likelihood you cannot rollback to a previous snapshot or AMI the same likelihood that a file gets lost in s3? Amazon S3’s standard storage is: ... Designed to provide 99.999999999% durability and 99.99% availability of objects over a given year. http://aws.amazon.com/s3/

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• Best way to replicate / mirror 100s of databases in SQL 2005

  - by mrwayne

  Hi, I currently host around 400-500 SQL 2005 databases of varying sizes (1-10 gig) each. I am aware of most of the different methods available and the general pros/cons of mirroring, log shipping, replication and clustering, but i am not aware of how well they tend to perform when its employed at the size i have specified (400-500 unique databases). Does anyone have any good advice on what is likely the best method for having the ability to fail over to another server with this sort of setup? Fail over does not need to be immediate, i'm just looking for something better than taking backups every day and moving them to storage. I'm preferably looking for something that would also makes it easy to manage the databases in bulk (as opposed to one at a time). Thanks for your input!

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• Can't get Intel drivers for ASUS P6T Deluxe

  - by Alex K

  Hi everybody, A few days back my Win7 Ultimate started bugging me to install the RAID drivers for my ASUS P6T Delux. Fine, I'm all for having up to date drivers even for stuff I don't use. The problem is that the drivers I download from both ASUS support site here and the ones I get directly from Intel (can't post the second link, since I have less than 10 rep, but it's the first hit for "Intel(R) Matrix Storage Manager Driver" on google) say that my system does not meet the minimum system requirements. Impossible, I would think, what with it having the X58 chipset and the Windows version is supported one. Has anyone encountered something like this before? Any clues on how to solve this would be much appreciated. Thanks!

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• Windows 2008 and Truecrypt: can't access shared folder called "media"

  - by Sajee

  On my Windows 2008 system, I've attached an external USB drive that's encrypted using Truecrypt. Once I mounted the Truecrypt drive, I share some of the directories from that drive using Windows file sharing. I tried sharing a folder called "media" and when I try to access that folder from a Vista client on my LAN via \myserver\media, I get this error: \myserver\media is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions. An unexpected network error occurred. If I share the folder media under some name such as fizzbuzz then I can access \myserver\fizzbuzz w/o any errors. Any clues as to why this is happening? Related: http://serverfault.com/questions/27684/windows-2008-and-truecrypt-how-to-automatically-mount-shared-folders-after-rest

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• eSATA hotswap using Jmicron JMB363 controller

  - by Stephen

  I have tried both IDE and AHCI modes in the BIOS. Also tried many different driver revisions. I can't seem to hot swap an external SATA drive. I can use the wizard to safely remove it, but reconnecting doesn't do anything unless I reboot. I use a thermaltake dock, and I would like to swap in my backup drive sometimes to do images (they take all day over USB). I can reboot, but I'd like to use hot swap. The controller is a Jmicron JMB363. I'm using the latest BIOS on my motherboard, as well.

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• Using ethernet cables?

  - by Farhad Yusufali

  I have an HDTV which supports internet connectivity through an ethernet port or wirelessly (but this requires an additional wireless USB adapter, which I don't have). I also have a blue ray player than supports internet connectivity through an ethernet port or wirelessly (natively - no other devices are needed). I want to connect my TV to the internet but my router is too far away. My blueray player however is already connected wirelessly. If I connected my TV to my Blueray player via ethernet, would my TV be able to connect to the internet? To clarify: Wireless Signal - Blue Ray Player - Ethernet Cable - TV Would this work?

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• PC reboots automatically in the begining

  - by user233508

  I have a AMD Phenom II 3GHz. 2 GB RAM system running on Windows 7. Off late my PC does not start properly I have to start it at least 7-8 times before it starts. It starts and then shuts down. Every time the time for which the system is up increases. After 7-8 attempts it starts an works fine. I have to give it a min between restarts (USB mouse light goes off). If I try restarting before this time the PC does not start. I am suspecting humidity playing some factor as this issue has started creeping up ever since the rains have started.

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• HP DL160 vs DL360 for virtualization

  - by Chris

  Hi, We're planning to consolidate our infrastructure (a dozen servers). We'll buy two or three identical new servers who will be setup as a XenServer pool. Load balancing and HA tools will monitor the pool and vMotion VMs in case of failure/overload. I know that the DL100 series of HP servers is cheaper than the DL300 serie (in every sense of the word). As we don't need local storage (we have a SAN) and can live with a temporary down server (provided that Xen Server HA tools work as advertized), what are the downsides going with the DL100 serie ? Thanks, Chris

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• PostgreSQL server: 10k RPM SAS or Intel 520 Series SSD drives?

  - by Vlad

  We will be expanding the storage for a PostgreSQL server and one of the things we are considering is using SSDs (Intel 520 Series) instead of rotating discs (10k RPM). Price per GB is comparable and we expect improved performance, however we are concerned about longevity since our database usage pattern is quite write-heavy. We are also concerned about data corruption in case of power failure (due to SSDs write cache not flushing properly). We currently use RAID10 with 4 active HDDs (10k 146GB) and 1 spare configured in the controller. It's a HP DL380 G6 server with P410 Smart Array Controller and BBWC. What makes more sense: upgrading the drives to 300GB 10k RPM or using Intel 520 Series SSDs (240GB)?

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• Dual booting windows 8.1 and ubuntu

  - by Sriniketh

  I have a lenovo laptop with windows 8.1. I wanted to use ubuntu alongside windows. Hence, i downloaded the ubuntu 14.04 iso and created a live pendrive using Universal USB installer. I disabled secure boot and booted from the pendrive. All i get is the GNU GRUB command line version 2.X. I don't get a GUI for the GRUB and i don't know how to boot into ubuntu from the command line. I searched quite a few online forums but in vain. Can someone tell me how to proceed? Thanks in advance.

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• Fragile XenServer won't create new VDIs anymore

  - by thoiz_vd

  I'm getting increasingly frustrated with XenServer. Currently I'm using 5.6FP1 and it seems to be very fragile. Canceling any VDI-related action almost guarantees trouble. This time I tried to create a new VM using a snapshot for a template, with the fast disk cloning option disabled. It would take much longer than I was able and willing to keep my XenCenter open, so I canceled it. That took ages too, so I had to decide to "Quit Anyway." Since, I seem unable to create any new VDI. New attempts at cloning halt with "The attempt to clone the VDI failed," and creating new VMs based on built-in templates hang at "Provisioning." I'm in need of some advice how to solve this. What I did so far is run a xe vdi-list, which returned nothing odd to me, but I'm no expert. I assume that an incomplete VDI is blocking my Storage Repository somehow, however, how to deal with that remains unclear.

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• Keyboard automatically disconnects and reconnects

  - by Algorithms

  The problem i am facing is the keyboard (USB) automatically disconnects when there is a fluctuation in the power supply to the speaker. The speaker and the pc both draw power from a apc ups. The fluctuation occurs because the speaker plug is not tightly connected to the ups power outlet. It is okay for normal work, but a accidental jerk causes the fluctuation. However after some amount of time (usually within 5 seconds) the keyboard automatically reconnects and windows plays the sound of hardware connected. This problem will also occur if I manually take out the speaker power cable from the ups power outlet. My question is whether the problem I am facing is due to electrical issues, or due to software problems. PC config: OS : Windows 7 Ultimate UPS : APC 600 VA PSU : Corsair TX 650 Speaker : Realtek

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• Wildcards not being substituted

  - by user21463

  #!/bin/bash loc=`echo ~/.gvfs/*/DCIM/100_FUJI` rm -f /mnt/fujifilmA100 ln -s "$loc" /mnt/fujifilmA100 For some reason the variable * doesn't get substituted with the only possible value and gets given the value /home/chris/.gvfs/*/DCIM/100_FUJI. Does anyone have an idea of why? Please note: If global expansion fails, the pattern is not substituted. I ran the commands: chris@comp2008:~$ loc=`echo ~/.gvfs/*/DCIM/100_FUJI ` chris@comp2008:~$ echo $loc /home/chris/.gvfs/gphoto2 mount on usb%3A001,008/DCIM/100_FUJI So we can see the expansion should work I have now switched to using: loc = `find ~/.gvfs -name 100_FUJI ` I am just curious why it doesn't work as is. Debugging output using sh -x echo /home/chris/.gvfs/*/DCIM/100_FUJI loc=/home/chris/.gvfs/*/DCIM/100_FUJI rm -f /mnt/fujifilmA100 ln -s /home/chris/.gvfs/*/DCIM/100_FUJI/mnt/fujifilmA100

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• Unable to login to arch linux

  - by Ayodhya

  I am new to archlinux. I am using live usb for archlinux. When I booted it said not a COM32R image. I explored on Google, used Tab and choose have64 and then it booted. Now I am not able to login I used password root but it's not accepting. I also used startx but nothing happened. I am using archlinux-2014.06.01-dual iso downloaded from archlinux website. I see the the following Arch Linux Menu after boot-up Boot Arch Linux (x86_64)(NBD) Boot Arch Linux (x86_64)(NFS) Boot Arch Linux (x86_64)(HTTP) Boot Arch Linux (i686)(NBD) Boot Arch Linux (i686)(NFS) Boot Arch Linux (i686)(HTTP) Boot Existing OS I Choose First one and fourth one (NBD) for live boot and i am having the problem mentioned above.

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• win xp client, win 7 host, only xp drivers

  - by brett

  I have a win 7 64 bit box which has xp on it in a vmware module and also the win7 version. I can use my old usb wifi card under virtual xp as i have the wifi drivers, but apparently the manufacturing company never made any further drivers, nor did it release the source code. Is it possible to get networking between the client and the host, so that my host can browse etc? I thought the microsoft loopback adapter might be the answer but ever example i can find of it's use describes a setup where the host is connected fine and needs to route data to the client as well.

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