Discuss March 2007

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401 discussions

RE: [CentOS] Tape drive recommendations
by Mark Schoonover 29 Mar '07

29 Mar '07

John R Pierce wrote: > Aron.Darling(a)Emulex.Com wrote: >> Loader are totally a love/hate relationship. They do make life a lot >> easier as they do the tape movements for you which can be a tedious >> thing at times. With a loader or library you can script the entire >> operation with tar, MTX and MT and let cron do all the work for you. >> Always look for the OEM rather than buying the name brand equipment, >> they are most always the same HW and FW with a different model >> number in it. > > > otoh, its hard to beat a 3 year warranty and on location support from > the same vendor as your server hardware, assuming your a brand name > shop in the first place.... hugely reduces finger pointing when > there's a complex issue to resolve. with OEM hardware bought on the > whitebox market, you're often faced with replace or self-repair > option at cost. > Having used a 20 tape library, and suffering through restores with AIT2 tapes taking 10-12 hours per tape, I gave up on them. I went with good old rsync, and built up a 4 TB system to handle backups. Once configured, it's nearly a 100% hands off solution. You can read about what I've done here: http://marks-tech-pages.blogspot.com Works great especially for TBs of data that needs to be backed up every day. HTH Mark Schoonover IS Manager American Geotechnical - California, Nevada and Arizona V-> 858.450.4040 F-> 714.685.3909 C-> 858.472.3816 "Eternity is a very long time, especially towards the end." -- Stephen Hawking

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RE: [CentOS] Tape drive recommendations
by Mark Schoonover 29 Mar '07

29 Mar '07

Joshua Baker-LePain wrote: > On Wed, 28 Mar 2007 at 10:07pm, Mark Schoonover wrote > >> Having used a 20 tape library, and suffering through restores with >> AIT2 tapes taking 10-12 hours per tape, I gave up on them. I went >> with good old > > One of the lovely bits about LTO3 -- 400GB native, 80MB/s => restore a > whole tape in under 2 hours. Joshua, 200 gigs an hour is pretty good for a tape, but what happens if the tape you've backed up to is bad, or has a bad spot? You've lost your backup. 400GB in drives is a fraction of the cost of tapes these days. I do agree, my max throughput over a quiet gigbit network is going to be around half the speed of the LTO, I look at the fact that I'm only backing up the daily changes, not an entire server like you'd do to tape. With rsync doing compression over SSH, it looks like I'm backing up an entire 1.3TB system in 90 mins. Sure, you can do differental backups to try to keep your number of tapes to a minimum. Backing up straight to disk ends up being faster all around, plus it's on a RAID5 system so loosing a drive isn't all that big a deal. Going to disk is also fast enough, I can run hourly backups during business hours. Where LTO tapes will outrun is during a total server failure where I have to restore all data back to a server. Then my network becomes the bottleneck, but you still won't have to gamble spanning across multiple tapes to fit >400GB of data. My past problems have never been with backing up, it's been with restoring the data. Either too slow to restore, or since I needed 10 tapes to backup, I'd end up with one of them having a bad spot that would abort the restore. The only way to know for sure if your tapes are 100% is to try to do an entire restoration. Simply running a tape verify isn't enough. Cost is another factor. An Exabyte LTO3 1x7 loader is MSRP $6500, with 20 tapes $1130 in a pack. My 4TB backup server cost just under $5000 at the time, cheaper today. Then, you have the daily admin of flipping tapes. Disks run without intervention once configured, and it's nice to have especially if you have employees working over the weekends, or on holidays. These were just my requirements, and my thought processes that lead me away from tapes all together. YMMV, your specifics are probably different. Mark

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RE: [CentOS] Tape drive recommendations
by Mark Schoonover 29 Mar '07

29 Mar '07

Les Mikesell wrote: > Mark Schoonover wrote: >> John R Pierce wrote: >>> Aron.Darling(a)Emulex.Com wrote: >>>> Loader are totally a love/hate relationship. They do make life a >>>> lot easier as they do the tape movements for you which can be a >>>> tedious thing at times. With a loader or library you can script >>>> the entire operation with tar, MTX and MT and let cron do all the >>>> work for you. Always look for the OEM rather than buying the name >>>> brand equipment, they are most always the same HW and FW with a >>>> different model number in it. >>> >>> otoh, its hard to beat a 3 year warranty and on location support >>> from the same vendor as your server hardware, assuming your a brand >>> name shop in the first place.... hugely reduces finger pointing >>> when there's a complex issue to resolve. with OEM hardware bought >>> on the whitebox market, you're often faced with replace or >>> self-repair option at cost. >>> >> >> Having used a 20 tape library, and suffering through restores with >> AIT2 tapes taking 10-12 hours per tape, I gave up on them. I went >> with good old rsync, and built up a 4 TB system to handle backups. >> Once configured, it's nearly a 100% hands off solution. You can read >> about what I've done here: http://marks-tech-pages.blogspot.com >> Works great especially for TBs of data that needs to be backed up >> every day. > > If you want something that stores the backups much more efficiently > (with a price in processing to do it), look at backuppc: > http://backuppc.sourceforge.net/ > > It compresses everything and hardlinks all duplicates so you can keep > about 10x what you'd expect online, and it has a nice web interface > for browsing the backups and doing restores. Thanks Lee. I did look at backuppc before, and I didn't want anything that compresses files, or used a web interface. Using rsync, it's a matter of scp to restore, and that's it. I do use hardlinks to duplicate data, so my storage requirements are kept as small as possible. Just about any CentOS system can be configured to run backups in the manner I've written up, nothing extra to install or learn. So, like most things, it boils down to individual needs and expertise. I know for myself, tape backups just weren't working well at all. Thanks! Mark

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cad - 3d in linux
by devel 28 Mar '07

28 Mar '07

Hello, Anyone know program capable of import 3ds files of Autodesk, similar to 3ds studio for linux? -- -- Publicidad http://www.pas-world.com

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Re: [CentOS] removed centos from dual boot laptop (now having trouble booting)
by Pitshou Asingalembi 28 Mar '07

28 Mar '07

i think that you can also use software that permit you to put xp's partition to be bootable: 1.DOS fdisk 2. Debian(only put xp's partition to be bootable and you can stop your installation). --------------------------------- Découvrez une nouvelle façon d'obtenir des réponses à toutes vos questions ! Profitez des connaissances, des opinions et des expériences des internautes sur Yahoo! Questions/Réponses.

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Using yum 2.4.x under centos3
by carlopmart 28 Mar '07

28 Mar '07

Hi all, Somebody have test it yum 2.4.x (http://linux.duke.edu/projects/yum/download/2.4/yum-2.4.3-1.src.rpm) under centos3?? I have installed an mrepo RHEL5 server to serve updates for rhel3, rhel4, rhel5, centos3, centos4 and centos5 (when becomes GA) and RHEL5 doesn't provides yum-arch ... Thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

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Thanks to the list for 3ware RAID info...
by Mailing Lists 28 Mar '07

28 Mar '07

All: Thanks to everyone who participated in the rather long thread recently about RAID arrays and CentOS. I have been needing to research RAID for CentOS for some time, so the discussion was timely for me. Based on the discussion in that thread, I bought a 3ware 9650SE card and a bunch of WD drives. I was told by 3ware that 9650SE driver will likely not be in the CentOS 5 kernel (unless RH put it there) since it is based on 2.6.18. The 9650SE driver is not in the Linux kernel until 2.6.19. However, 3ware said they would be happy to provide a driver disk to use with the installer, so it will be no big deal. In case anyone else will find this useful, I would like to say that I am planning to use these with a 975XBX2 logic board from Intel (975X chipset). The 3ware rep said that the 9650SE card does work with the 975XBX2 with the latest Intel firmware. I have built 4 servers (3 for Asterisk, 1 for MySQL) around this "desktop" board and the all run CentOS very nicely. Again, thanks for all the info. CentOS really has a great community! -Joe

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Zimbra, Scalix or something else..
by Centos-admin 28 Mar '07

28 Mar '07

Hello all, I've played with both Zimbra and Scalix and they seem quite nice and do pretty much what I want. I'm now at the point where I am considering retiring my trusty old courier-imap service in favour of one of these two, unless of course anyone has any other recommendations or suggestions. I'd probably be doing this inside a centos 4.4 Xen VMs running on centos 5 when it comes out. Also, I'd really appreciate if anyone could share any thoughts and/or experiences with Zimbra and Scalix. Cheers, Brian. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

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CentOS plus and sharing usb hdd
by Filianx 28 Mar '07

28 Mar '07

Hi, anyone got an idea if I use the CentOS plus kernel for CentOS 4.4 will I be able to share an attached usb drive ( attached to the CentOS box ) over my home network, I can't with the default kernel Ta. -- Filianx

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Cannot Add Virtual Guest
by Rob Kettle 28 Mar '07

28 Mar '07

Hello, I have installed CentOS 5 beta and am trying to create a Guest Virtual Machine using the graphical interface. I complete the various boxes and when I click Finish I get a message saying that it cannot mount the NFS location that I supplied for the source of the install media. I can mount the NFS share manually in a terminal window so I know I have the correct path. Any help woudl be appreciated. Rob -- This message has been scanned for viruses and other dangerous content by MailScanner, and is believed to be clean.

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Discuss March 2007