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Re: [CentOS] Slightly OT: which hardware for CentOS file server (Samba, 2 To storage, 50 users)?
by Les Bell 14 Apr '10

14 Apr '10

Niki Kovacs <contact(a)kikinovak.net> wrote: >> And so on. In the end, I decided not to bother and just left. << I think most consultants have one* of those in their pasts. The trick is to cut your losses, as soon as possible. You had a narrow escape there. Best, --- Les Bell [http://www.lesbell.com.au] Tel: +61 2 9451 1144 * Two, just possibly. Three, and you're a slow learner who has no business being a consultant.

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Disappearing DNS entry
by Hugh E Cruickshank 14 Apr '10

14 Apr '10

CentOS 4.8, BIND 9.2.4, DHCP 3.0.1 Hi All: I have a rather perplexing problem where the DNS entry in BIND for one of my network printers sporadically "disappears" from our zone file (but not the reverse zone file). We have four Lexmark printers connected locally over our internal LAN using static IP addresses. We have 3 T640n printers and a T642n printer and it is only the T642n printer that this is happening to. I thought I had it licked when I discovered that both DDNS and mDNS were enabled on this printer but not the others, however disabling those has had no effect. We do use DHCP for the bulk of our Windows workstations and DHCP is configured to update the DNS server and this appears to work fine (once I disabled all the "Register this connection's address in DNS" options on the workstations). I have found one suspicious entry in /var/log/messages: Apr 12 17:34:14 fisds0 named[5210]: client 192.168.2.7#10242: updating zone 'forsoft.com/IN': deleting an RR This would seem to indicate that the printer itself has issued the request to the DNS server but for the life of me I cannot see what might be doing it. Has anyone encountered something similar and can point me in the right direction? TIA Regards, Hugh -- Hugh E Cruickshank, Forward Software, www.forward-software.com

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XFS-filesystem corrupted by defragmentation Was: Performance problems with XFS on Centos 5.4
by Bernhard Gschaider 13 Apr '10

13 Apr '10

Before I'd try to defragment my whole filesystem (see attached mail for whole story) I figured "Let's try it on some file". So I did > xfs_bmap /raid/Temp/someDiskimage.iso [output shows 101 extents and 1 hole] Then I defragmented the file > xfs_fsr /raid/Temp/someDiskimage.iso extents before:101 after:3 DONE > xfs_bmap /raid/Temp/someDiskimage.iso [output shows 3 extents and 1 hole] and now comes the bummer: i wanted to check the fragmentation of the whole filesystem (just for checking): > xfs_db -r /dev/mapper/VolGroup00-LogVol04 xfs_db: unexpected XFS SB magic number 0x00000000 xfs_db: read failed: Invalid argument xfs_db: data size check failed cache_node_purge: refcount was 1, not zero (node=0x2a25c20) xfs_db: cannot read root inode (22) THAT output was definitly not there when I did this the last time and therefor the new fragmentation does not make me happy either xfs_db> frag actual 0, ideal 0, fragmentation factor 0.00% The file-system is still mounted and working and I don't dare to do anything about it (am in a mild state of panic) because I think it might not come back if I do. Any suggestions most welcome (am googling myself before I do anything about it). I swear to god: I did not do anything else with the xfs_*-commands than the stuff mentioned above Bernhard

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centos 5.3x64 iso
by aurfalien＠gmail.com 13 Apr '10

13 Apr '10

Hi all, My 5.3 DVD is ruined and the 5.4 installer won't run on my box w/o errors (uts not the disk, something to do with the installer itself). I usually just install 5.3 and then yum it to 5.4. Does any one know were I can find a 5.3x64 iso file? - aurf

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Re: [CentOS] 12-15 TB RAID storage recommendations
by Seth Bardash 13 Apr '10

13 Apr '10

Just finished building a new server for inhouse use. 12.8TB Needed a nfs and samba server which could store 10TB and be reliable. Also wanted to replace out DHCP server and our internal DNS server. So needed to run dnsmasq plus ntp for time serving. This machine replace 3 older units. We used a Supermicro 3U case with 15 sata shuttles and 2N+1 760 Watt PS. On ebay for 300.00 Used a Supermicro H8DME-2 MB cause I had one sitting around. If I was going to buy one it would have been a Tyan S2932G2NR-SI for reliability (we have sold a bunch of these and they always work) Installed dual AMD 2382's and 16 GB DDR2-800 RECC plus 4 wire HSF's. Went to the 3ware online store and purchased a 9550SXU-16ML with the breakout cables for 340.00 Yes, I know its PCI-X. It was inexpensive and it runs almost as fast as the 9650 series at twice the price. Installed 15 pcs of the WD1001FALS disks. Very reliable and low cost even though they are desktop drives. Used these since we always have 3 on the shelf as spares and WD turns a bad one around in about 5 days. We have installed over 200 of these drives in raid arrays and have had 2 fail in the last 6 months. BTW, Initializing took <8 hours not days. Set it up as a Raid 5 array with one hot spare and autorebuild. Have tested it with both Centos 5.4 x86_64 and OpenSUSE 11.1 x86_64. Also installed an LSI SCSI card and a Sony AIT-5 Tape drive with Bacula for data backup and recovery. Again, all worked fine and the machine was able to do backups and keep a GigE connection saturated. Using an in house piece of code called disktest we are seeing 268 MB / sec on writes and 347 MB / sec on reads using 32 GB test files, 131K buffer sizes and single threading. If you would like to see a system that is almost identical, have a look at Coraid.com. They use a dual xeon and a BSD custom kernel. Hope this config helps...... Seth Bardash Integrated Solutions and Systems LLC seth(a)integratedsolutions.org Failure cannot survive knowledge and perseverance!

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12-15 TB RAID storage recommendations
by Boris Epstein 13 Apr '10

13 Apr '10

Hello listmates, I would like to build a 12-15 TB RAID 5 data server to run under ContOS. Any recommendations as far as hardware, configuration, etc? Thanks. Boris.

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Next Newsletter release
by Geerd-Dietger Hoffmann 13 Apr '10

13 Apr '10

Hey Due to that the last release was a last minute thing again I want to announce that no more information will be added to the Newsletter after the 25th. of April. So could everyone who wants to contribute please send me the stuff till then. This then should give us a week to proof read everything and give the translators a head start :) *I still need a user desktop photo* Cheers Didi -- Hoffmann Geerd-Dietger http://contact.ribalba.de

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Cluster Suite Question
by Joseph L. Casale 13 Apr '10

13 Apr '10

A while back I posted a question in the Linux-Cluster list and never got a reply. I am hoping maybe someone here has any insight? I have a service that I have changed the default from restart to relocate. Now I need to add one more script resource to it, but this script resource is not essential, and if it tanks, a restart will certainly be sufficient so I assume I have to create another service so I can tune the Restart Policy Extensions for it, whereas the Recovery Policy for the original remains as Relocate. I have looked all through the wiki and net, but I can't see how to group or tie services together so they always follow each other around? These two services can't be on distinct nodes, anyone have any ideas? Thanks, jlc

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CentOS-3, is this what I need?
by Prashant Saxena 13 Apr '10

13 Apr '10

Hi, I am new to linux and so far I have only used ubuntu. I have developed a python application which I would like package and distribute. The problem with packaging tools such as pyinstaller and cx_freeze is that you have to compile the bootloader first. Now If I compile the loader on karmic 9.10, the binary would suffer from compatibility issue. In other words I won't be able to execute the app on a lower version such as ubuntu 8.04.4 LTS. The solution is to use as much as old libc as you can to compile the bootloader. It seems CentOS-3 is based on glibc 2.3, which is pretty old and if I compile and do other stuff of on CentOS-3, it'll do the job and hopefully covers almost all the end user base that I am expecting will use the app. It may possible that I might face some issues with my requirements mentioned below but I have no practical idea about them. As I mentioned before that I am new to linux and I always prefer to use VirtualBox, when ever I try any new distribution. In short these are my requirements and I would like to know whether CentOS-3 is the right choice for me or not? 1. Use VirtualBox. XP Host & CentOS-3 guest. 2. python 2.6.4 3. wxPython 2.8.10.1 from wxWidgets repository 4. libcairo 1.8.8 5. pycairo 1.8.6 6. couple of other python modules. Are these packages available or if not can be downloaded from other repositories? I am also concerned about my requirements that whether they themselves will suffer from binary dependency issue or not because I of using CentOS-3. Some one also suggested that you should also compile your requirements(python, wxpython etc.) along with the bootloader and this would make your package and underlying libraries backward compatible and lesser chance of any failure. Best regards Prashant Your Mail works best with the New Yahoo Optimized IE8. Get it NOW! http://downloads.yahoo.com/in/internetexplorer/

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PXE Boot : Clonezilla
by premrajm＠digilink.in 13 Apr '10

13 Apr '10

Hi, I wanted to set up Clonezilla Tools on my client machine via PXE Boot. How do I do it. I got information from the web, but after making changes in the dhcpd.conf file, the dhcpd fails to start. In the BIOS after enabling the PXE Boot, iam not able to see an Clonezilla menu options that i have placed in /pxelinux.cfg file. Iam using centos-5.3 on Intel Board Please provide me with some more information on the same. Regards, Premraj Disclaimer : This message is proprietary to Smartlink Network Systems Ltd. and is intended solely for the use of the individual to whom it is addressed. It may contain privileged or confidential information and should not be circulated or used for any purpose other than for what it is intended. If you have received this message in error, please notify the originator immediately. If you are not the intended recipient, you are notified that you are strictly prohibited from using, copying, altering, or disclosing the contents of this message. The company accepts no responsibility for loss or damage arising from the use of the information transmitted by this email including damage from virus. ______________________________________________________________________________ This email has been scrubbed for your protection by SecureMX. For more information visit http://securemx.in ______________________________________________________________________________

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