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• Virtual fiber channel HBA in Solaris

  - by Phil

  We are trying to set up some virtual Fibre Channel HBA's in Solaris. This seems to be possible with NPIV. Creating NPIV's in a Solaris global zone works fine, but passing that NPIV to a zone didn't work at all. We tried to pass the NPIV as following: # zonecfg -z zone1 'info' zonename: studentz1 [...] device: match: /devices/pci@0,0/pci8086,25f9@6/pci8086,350c@0,3/pci1077,140@4/fp@1,0:devctl allow-partition not specified allow-raw-io not specified Wat we want to do is, set up an environment for SAN exercises. We don't have a physical host per student, so we try to virtualise that in some way (Solaris zones or VMware). It should be possible to display the WWN of the virtual HBA and mount the storage presented by the disk subsystem. Any ideas to pass the NPIV to a solaris zone or to virtualise this with vmware?

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• Proper management of PGPool II

  - by Cathy

  Currently I have a site, with one Postgres database server. It is just for a select number of users (less than ten) but it needs the maximum uptime possible. I would like some kind of automatic failover for the database. So I was thinking something like: one server running PGPool II, one running Postgres as master, one running Postgres as slave. But then, if wherever PGPool is running suddenly loses power (or dies, or whatever), there's a single point of failure and the whole thing goes down. Is there a solution, assuming that outsourcing this to someone else isn't possible?

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• Cloud Computing - Multiple Physical Computers, One Logical Computer

  - by Koobz

  I know that you can set up multiple virtual machines per physical computer. I'm wondering if it's possible to make multiple physical computers behave as one logical unit? Fundamentally the way I imagine it working is that you can throw 10 computers into a facility one day. You've got one client that requires the equivalent of two computers worth, and 100 others that eat up the remaining 8. As demands change you're just reallocating logical resources, maybe the 2 computer client now requires a third physical system. You just add it to the cloud, and don't worry about sharding the database, or migrating data over to a new server. Can it work this way? If yes, why would anyone ever do things like partition their database servers anymore? Just add more computing resources. You scale horizontally with the hardware, but your server appears to scale vertically. There's no need to modify your application's infrastructure to support multiple databases etc.

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• Cloud Computing - Multiple Physical Computers, One Logical Computer

  - by bundini

  I know that you can set up multiple virtual machines per physical computer. I'm wondering if it's possible to make multiple physical computers behave as one logical unit? Fundamentally the way I imagine it working is that you can throw 10 computers into a facility one day. You've got one client that requires the equivalent of two computers worth, and 100 others that eat up the remaining 8. As demands change you're just reallocating logical resources, maybe the 2 computer client now requires a third physical system. You just add it to the cloud, and don't worry about sharding the database, or migrating data over to a new server. Can it work this way? If yes, why would anyone ever do things like hand partition their database servers anymore? Just add more computing resources. You scale horizontally with the hardware, but your server appears to scale vertically. There's no need to modify your application's supporting infrastructure to support multiple databases etc.

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• Groups issue on Ubuntu

  - by grobarTN

  Hello, I am member of couple of groups lets say Master, Student, Web. The problem is that by default whatever I do is first created under student group. I need to set it so it is created with Web group. Folder www/ where I need to write file is already mode 770. But because it picks up my student group it does not allow me to write to that folder. Is there any way to change the group that I create files under. If I execute groups it lists all groups so I am member of correct group I just cant write to the folder. Anyone?

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• 10,000 RPM HDD (WD VelociRaptor) vs SSD for OS?

  - by GiH

  I currently have a 10,00RPM 150GB Raptor that I use for Vista. I'm about to upgrade to Windows 7, and while doing that I thought I'd buy another drive and install Ubuntu 9.10 on it. I don't want to partition the current drive I have, but I don't need 150GB for another OS. So, I'm having trouble deciding whether its worth it to buy a 64 GB SSD at the same price point as the 150GB WD VelociRaptor? Or should I just get a 7,200 RPM drive for really cheap (around $50)? Would it be better to use an SSD for the OS than a mechanical drive? I could always get a 32GB SSD too... Oh, and I don't want to virtualize Ubuntu because I'm going to be testing to see the differences in networking and overall performance.

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• HP Pavillion dm3 (Windows 7) BSOD,

  - by Lee

  HI I have a HP Pavilion dm3. It came up with a BSOD and then didn't give me an option to start up in safe mode. I dont have any cd drive, nor did it come with a Windows cd anyway. I presume that it has a partition in my laptop for that kinda stuff. I was hoping to boot it using a usb but I don't know how to do it or where to download the stuff from. I have access to network computers, so am able to download from the internet but it's not a Windows7 computer. I am able to download from the computers that I have access to, but unable to run any executable files on them. Can someone please help? Thanks in advance

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• Buffalo wireless router

  - by Walter White

  Hi all, I have a Buffalo wireless router and it appears to work fine, for the most part. However, printing out some debug information, I noticed that the Mode is reported as unknown/bug. In the DD-WRT configuration, I have selected AP which should be Master. I was having a problem earlier with my ESSID being a bunch of weird characters. I re-entered it and restarted the router and now the ESSID is correct. I tried re-entering the configuration for the router and it still is reported back as Unknown/bug via iwlist wlan0 scanning. Any ideas? Walter

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• Dovecot Virtual Users and Users Domain Mapping

  - by Stojko

  I have successfully compiled, configured and ran Dovecot with virtual users feature. Here's part of my /etc/dovecot.conf configuration file: mail_location = maildir:/home/%d/%n/Maildir auth default { mechanisms = plain login userdb passwd-file { args = /home/%d/etc/passwd } passdb passwd-file { args = /home/%d/etc/shadow } socket listen { master { path = /var/run/dovecot/auth-worker mode = 0600 } } } I faced one issue I can't resolve myself. Is there anyway to create users' domains mapping and provide username in mail_location? Examples: 1. currently I have /home/domain.com/user/Maildir 2. I'd like to have /home/USER/domain.com/user/Maildir Can I achieve this somehow? Greets, Stojko

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• How to use Binary Log file for Auditing and Replicating in MySQL?

  - by Pranav

  How to use Binary Log file for Auditing in MySQL? I want to track the change in a DB using Binary Log so that I can replicate these changes to other DB please do not give me hyperlinks for MySQL website. please direct me to find the solution EDIT I have looked for auditing options and created a script using Triggers for that, but due toi the Joomla DB structure it did'nt worked for me, hence I have to move on to Binary Log file concept now i am stucked in initiating the concept as I am not getting the concept of making the server master/slave, so can any body guide me how to actually initiate it via PHP?

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• serving static assets via http is really slow compared to sshfs (apache2/nginx)

  - by s1lv3r

  After migrating to a new VPS I had some users complaining about slow loading images on their sites. After creating some test files with dd I realized that I can download all files via sshfs with full speed while downloads via web are painfully slow. The larger the file is and the longer the transfer takes, the slower the transfer speed gets. I thought I had some problems with Apache and just spend the whole evening with replacing Apache2 against nginx for static file serving - with no effect at all. No I/O wait states in top. Tons of RAM free, no high CPU utilization and hdparm shows a decent I/O performance at all times. I just have no idea anymore, what's happening on this server. This is a link to a demo file: http://master.dealux.de/file.tgz Anybody an idea what I can check out?

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• XPP-32 over W7-64 on music production laptop

  - by quarlo

  I need to upgrade my laptop and need high performance for music production (recording and mixing). My audio interface manufacturer seems to be unable to successfully convert their drivers to 64-bit. I do not trust a virtual machine to handle real-time audio recording at low enough latency so ... I would like to install XP Pro 32-bit on a separate partition and dual boot since most of the machines that can handle this application now ship with Windows 7 64-bit flavors. I'd like to transit to 64-bit over time assuming M-Audio does eventually get a handle on 64-bit drivers, but really need to ensure that I can stay at 32-bit for now. Does anyone have any experience with this or something similar?

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• Considering building a new system; but undecided about chassis

  - by J.C. Bengtson

  I'm considering a new system build, and was thinking that this particular motherboard has features I need and like: http://www.tigerdirect.com/applications/searchtools/item-details.asp?EdpNo=667651&pagenumber=1&RSort=1&csid=ITD&recordsPerPage=5&body=REVIEWS#CustomerReviewsBlock .. but am unsure which model chassis to pair it with. I'd strongly prefer something from Cooler Master, as I'm a fan of their products, but am having a hard time deciding, and also don't want to get into some odd situation where the board doesn't properly fit. I plan on having two optical drives (5.25"), two internal HDs (3.5"), and will likely go with an SLI setup of 2 or possibly even 3 cards, so I'd need a chassis that is roomy enough to accomodate all of that, as well as the motherboard itself. Based on the stock available at that same site, do you all have any suggestions? The larger, the better, as I hate having components crammed together. Your help is most appreciated!

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• Dual boot Windows 7 with Windows 8- Dynamic Disk

  - by MeetM

  Its a long explanation. I have a HP Pavilion dm4 notebook. It has pre installed Windows 7 Home Pre. Recently, I tried to install Windows 8 developer preview on my notebook, but while installing, it only allowed me to insatll it on my primary Windows 7 drive I.e. drive C. I had kept 1 empty partition for Windows 8 but when I selectced that option, the next button at the bottom of the window just grey with some error saying Windows cannot boot from this drive....blah blah blah So I googled and found another way of doing it by VHD(virtual hard disk). This seemed to work but on restarting gave me "VHD_BOOT_INITIALIZATION_FAILED" error. After trying all possible ways for around 10 times, I gave up. I noticed that d only thing difference in d tutorials and my notebook is the Disk type. They all had Basic and I have Dynamic. Is that the reason m not able to boot Windows 8? Any suggestions?

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• Security and Windows Login

  - by Mimisbrunnr

  I'm not entirely sure this is the right place for the is question but I cannot think of another so here goes. In order to login to the windows machines at my office one must press the almighty CTRL-ALT-DELETE command combo first. I, finding this very frustrating, decided to look into why and found claims from both my sys and Microsoft stating that it's a security feature and that "Because only windows could read the CTRL-ALT-DELETE it helped to ensure that an automated program cannot log in. Now I'm not a master of the windows operating system ( as I generally use *nix ) but I cannot believe that "Only windows can send that signal" bull. It just doesn't sit right. Is there a good reason for the CTRL-ALT-DELETE to login thing? is it something I'm missing? or is it another example of antiquated legacy security measures?

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• WD My Passport detected but not assigned a drive letter

  - by abel

  I have a WD My Passport external drive which used to work fine on my Win7 x64 box until recently. Since the past few days, windows would not detect my external drive. However, Storage under disk management lists my external drive(which means windows can see my drive) but without a drive letter. I am not able to assign a drive letter(the option is grayed out). I installed EASUS Partition Manager which allows me to assign a drive letter, but fails to do so when I apply to save changes. What do i do to assign a drive letter to the drive or make windows to detect it as of old? The external drive works well on Win7 x32(dual boot, same system) and win7 x64 on another box. Update: cant comment from Opera Mini 6 @zeke the drive works absolutely fine on other Win7 boxes and on the dual boot win7 on the same system.

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• Format as NTFS without Journal

  - by palswim

  I have a flash drive that I'd like to format for use in Windows. I would like support for symbolic links, so I can't use FAT/FAT32/exFAT. I would prefer to use the ext4 filesystem and disable journaling, with the Ext2Fsd filesystem driver, but have (so far) found that I can't make soft links across filesystems that Windows will read, Ext2Fsd has an annoying bug about always mounting partitions as read-only and has problems resuming from sleep, and some programs have problems writing to the partition even after manually configuring Ext2Fsd to allow writes. So, I would like to use NTFS for the flash drive, but disable the journaling feature (causes extra writes), if possible. How can I do this?

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• How to proxy to different named databases on the same server using MySQL Proxy?

  - by cclark

  I would like to have two databases on my MySQL server: DEV_DB_A DEV_DB_B However, in order to keep everyone's scripts, Query Browser settings and anything else from changing when we switch from using on DB to another I'd like to have everyone connect to DEV_DB and then use something like MySQL Proxy running a lua script which knows the currently active DB is DEV_DB_A and routes queries to there. If we restore a fresh version of the DB to DEV_DB_B or make some changes (e.g. partition a table) we can easily switch to DEV_DB_B by changing one Lua script instead of updating references everywhere. I had hoped I might be able to symlink inside of the mysql data directory but that didn't work so it seems like MySQL Proxy is a reasonable approach. Being new to Lua and MySQL Proxy I'm wondering if anyone else has approached the problem this way and how it worked.

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• Ubuntu 12 Server messing up my hard disk

  - by Jeroen Jacobs

  I'm installing Ubuntu server on a disk with 12GB available. During the setup, I choose the default LVM-based partition layout. However for some reason, Ubuntu decides that it only wants to use 4GB of this disk. How do I reclaim the remaining space of the hard disk? "lvextent" doesn't work btw... output of df -h: Filesystem Size Used Avail Use% Mounted on /dev/mapper/ubuntu-root 4.3G 3.4G 754M 82% / udev 3.9G 4.0K 3.9G 1% /dev tmpfs 1.6G 756K 1.6G 1% /run none 5.0M 0 5.0M 0% /run/lock none 3.9G 0 3.9G 0% /run/shm /dev/sda1 228M 25M 192M 12% /boot output of pvdisplay: --- Physical volume --- PV Name /dev/sda5 VG Name ubuntu PV Size 12.32 GiB / not usable 2.00 MiB Allocatable yes PE Size 4.00 MiB Total PE 3154 Free PE 8 Allocated PE 3146 PV UUID dD06RZ-kGcL-1tTX-Ruds-XIDG-ssMd-FIUkzZ my partitions: Device Boot Start End Blocks Id System /dev/sda1 * 2048 499711 248832 83 Linux /dev/sda2 501758 26343423 12920833 5 Extended /dev/sda5 501760 26343423 12920832 8e Linux LVM when I try lvextent, it says there is not enough diskspace.

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• How to have supervisord follows the new unicorn process after USR2 rolling restart?

  - by ybart

  I have configured supervisord to track my unicorn server process. When I send USR2 process, this performs a rolling restart. After this operation the old unicorn master have restarted and then changed PID. This caused supervisor to lose track of the unicorn process considering it as EXITED. How can I have supervisord to follow the new unicorn process after this operation ? Unicorn has a PID file available, but I have not found an option in supervisord configuration for this. An other option would be to have supervisord to send itself the USR2 signal, but I don't know how to perform this and whether it will prevent my problem from occurring.

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• Worth it to move /var to physical disk vs logical?

  - by Tammer Ibrahim

  Brief question about partition layout. I use an SSD for /, /boot, /usr, & /home partitions. I'd like to move /var to a mechanical disk to minimize writes to the SSD. I'm mainly concerned about maximizing drive life rather than maximizing performance (although I obviously wouldn't want to cripple my server). My mechanical disks consist of two drives sharing LVM, and a third used for nightly rsync backups. I also have a bunch of old 2.5in hard disks lying around. My question is, should I simply create a new LVM volume '/var' on my primary data store, or would it be worth the increased energy consumption (in terms of maximizing the lifetime of the LVMed drives) to install a low volume 2.5in disk to use just for /var? On a more general level my question is about the trade offs of placing OS mounts on the same physical volumes as my data. Thanks for any help!

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• Recover data from an ''unpartitioned'' hard drive

  - by Rafael S. Calsaverini

  I'm trying to recover data from a hdd for a friend from work. He was using it on an old win98 PC (so I guess it was a FAT 16 filesystem). When he installed the drive on a new PC his Windows XP can't recognize the filesystem and give an error message saying that the drive is unformatted. I tried to mount the hdd under linux but no partitions appear to be associated with the drive (I have only /dev/sdb associated with that drive and no /dev/sdb1 or sdb2 etc). I've found many articles on the web on how to recover partitions (with scripts like dd and ddrescue) but how do I make it when I have no partitions and the system say my drive is unpartioned? Is it possible to create a new partition without loosing the data?

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• Entering data into AD LDS

  - by Robert Koritnik

  I need some help configuring AD LDS (Active Directory Lightweight Directory Services). I'm not an administrator, have never configured domains and I don't have a clue how to add new users to existing domains. The thing is I need to develop an app that must be connected to AD. I've chosen AD LDS because I can install it on Windows 7 and it acts as an active directory even though there's no dmain controller present in the network. What I've done so far: I've installed AD LDS I've added a new instance with appication directory partition name DN=Air,DC=Watanabe,DC=pri I can connect to it using ADSI Edit and see all kinds of strange But now I don't know what to do? When it opens I can see the window below, but where's next? Can anybody give me some guidelines, how can I add domain users, so I can use them in my app AD required app?

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• reiserfsck --rebuild-tree failed: Not enough allocable blocks

  - by mojo

  I have a reiserfs volume that required a --rebuild-tree, but is currently failing to complete when I pass it --rebuild-tree. Here is the output that I receive when running it: reiserfsck 3.6.19 (2003 www.namesys.com) # reiserfsck --rebuild-tree started at Mon Oct 26 13:22:16 2009 # Pass 0: # Pass 0 The whole partition (7864320 blocks) is to be scanned Skipping 8450 blocks (super block, journal, bitmaps) 7855870 blocks will be read 0%....20%....40%....60%....80%....100% left 0, 9408 /sec 287884 directory entries were hashed with "r5" hash. "r5" hash is selected Flushing..finished Read blocks (but not data blocks) 7855870 Leaves among those 6105606 Objectids found 287892 Pass 1 (will try to insert 6105606 leaves): # Pass 1 Looking for allocable blocks .. finished 0%....20%....40%....60%....80%....Not enough allocable blocks, checking bitmap...there are 1 allocable blocks, btw out of disk space Aborted I can't mount it, and I can't fsck it. I've tried extending the volume, but that hasn't helped either.

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• Can't figure out why hard drive is full [closed]

  - by Belgin Fish

  Possible Duplicate: How do I find out what is using up all the space on my / partition? No Free disk space so I have 2 hard drives in my server, one main one that is 10gb and then a separate one that is 2tb I'm storing all the files on the second one and the df -h output looks like this Filesystem Size Used Avail Use% Mounted on /dev/sda2 9.2G 8.8G 0 100% / tmpfs 1.5G 0 1.5G 0% /lib/init/rw udev 1.5G 148K 1.5G 1% /dev tmpfs 1.5G 0 1.5G 0% /dev/shm /dev/sda4 1.8T 747G 981G 44% /home /dev/sda4 1.8T 747G 981G 44% /usr/lib/cgi-bin I just can't figure out why the first one is full when all the files are being stored in the /usr/lib/cgi-bin I'm running debian I can't seem to find any files that would take up 8.8gb that arn't on the second hard drive :S Thanks!

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