Discuss October 2006

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260 participants
296 discussions

RE: [CentOS] IP addressing migration
by Alex Palenschat 13 Oct '06

13 Oct '06

> Hi, > > I am changing the IP addressing in my centOS server which > works as mail server. The question I have is, if I define the > new IP addresses > (sub-interfaces) on the server, can I work with both ranges > at the same time despite I have only one default gateway > configured? (on the old range) Or may I have two default > gateways in centOS? > > --Ivan. Answer may be determined by whether those 2 ip are in the same subnet or not. If they are it will work fine, if not there are some workarounds: http://www.linode.com/wiki/index.php/Multiple_IPs alex

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Cluster Quorum Question/Problem
by Brandon Hall 13 Oct '06

13 Oct '06

Greetings all, I am in need of professional insight. I have a 2 node cluster running CentOS, mysql, apache, etc. I have on each system a fiber HBA connected to a fiber SAN. Each system shows the devices sdb and sdc for each of the connections on the HBA. I have sdc1 mounted on both machines as /quorum. When I right to the /quorum from one of the nodes, the file doesn't show up on the other. However, if I unmount and remount the device on the system that can't see the new file, the file shows up, but is broken/red and cannot be accessed by the node that couldn't see it in the first place. This works in both directions. Do I have things set up wrong? I'm so confused..... If they are sharing the same virtual drive on the same device in the same place, how can it not be the same on both systems??? Any help is appreciated! _________________________________________________________________ SearchYour way, your world, right now! http://imagine-windowslive.com/minisites/searchlaunch/?locale=en-us&FORM=WL…

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RE: [CentOS] Write performance with 3ware 9550
by Bowie Bailey 13 Oct '06

13 Oct '06

Kirk Bocek wrote: > Responding to several of your posts here. I understand your need for > stability, but can't you set StorSave down and see what it does to > your speed? I could, but I don't see the point. I have one machine with StorSave set at "Protect" which writes at 60MB/Sec. The other identical system which is also set to "Protect" only writes at 20MB/Sec. Therefore, there must be something else at work. As we speak, I have swapped the hard drives in these two systems and I am running another test. This will at least tell me if the problem is based in the hard drives & OS or elsewhere in hardware. > Some of my 95MB/Sec was achieved with some of the suggested ext3 > journal settings. Look back through my previous thread. > > Memory interleaving on my system (Supermicro X7DVL-E) is turned on > automatically when you install two pairs of memory sticks. With 16GB > on your system, I *assume* you have at least 4 sticks. Check the > manual and see if there is a BIOS setting. I found the interleaving settings in the BIOS. Both systems currently have it turned off, so I haven't touched it at this point. Once I have determined why the performance is so different between these two machines, I may experiment with that setting to see if it helps. Right now, I am not looking for maximum performance. I am just trying to determine why there is a 3x difference in write performance between two identical machines. -- Bowie

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RE: [CentOS] Write performance with 3ware 9550
by Bowie Bailey 13 Oct '06

13 Oct '06

Joshua Baker-LePain wrote: > On Thu, 12 Oct 2006 at 7:58pm, Bowie Bailey wrote > > > With NCQ off, I get these results: > > > > Version 1.03 ------Sequential Output------ --Sequential > > Input- > > --Random- > > -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- > > --Seeks-- > > Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec > > %CP /sec %CP Second 50G 20853 8 41899 11 > > 192713 23 116.9 1 > > > > Write performance increased by 2M/s and read performance decreased > > by 2M/s. > > > > What tweaks have you applied so far? I would expect a 4-drive array > > to be slower than an 8-drive array, but not this much! > > What's your StorSave profile set to? StorSave is set to Protection. Data integrity is very important on this system, so I need to leave it as is. Besides, I don't want to disable the data journaling after paying $100 for a BBU to protect it. :) -- Bowie

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RE: [CentOS] Write performance with 3ware 9550
by Bowie Bailey 13 Oct '06

13 Oct '06

Kirk Bocek wrote: > chrism(a)imntv.com wrote: > > I'm doing this from memory as the machine is at another location > > now. I think I did this: > > > > turned off ncq (per Josh's suggestion) > > turned on write caching (it's on an oversized ups and the data > > isn't critical) set storsave to "performance" > > changed the memory interleave (thanks to kirk's suggestion). It > > was off by default. used parted to create gpt disklabel > > set noatime and one other option that was suggested here for the > > RAID partition used mke2fs -j -b 4096 /dev/blah > > > > That was it. > > Okay, now try installing kernel-module-xfs and xfsutils (located in > the centosplus repository), run mkfs.xfs on some unused space, mount > and re-run bonnie++. I'm sure that would be faster, but I'm sticking to ext3 for now. -- Bowie

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RE: [CentOS] Write performance with 3ware 9550
by Bowie Bailey 13 Oct '06

13 Oct '06

Kirk Bocek wrote: > What's the motherboard or manufacturer and model? Knew I was forgetting something... :) OS: CentOS-4.4 (fully patched) Motherboard: Tyan Thunder K8HM CPU: dual Opteron 280 Memory: 16GB Raid card: 3ware 9550SX-8LP Raid volume: 4-disk Raid 5 with NCQ and Write Cache enabled -- Bowie

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RE: [CentOS] Write performance with 3ware 9550
by Bowie Bailey 13 Oct '06

13 Oct '06

Kirk Bocek wrote: > chrism(a)imntv.com wrote: > > To what end? I'd absolutely NEVER use it in production that way. > > That's *plenty* fast for me. > > On the current system I built, the best I could get from ext3 on a > 4-drive raid-5 array was 95MB/Sec writes. With XFS I'm getting > 220MB/Sec+. For a media server, I want the extra speed. For me, ext3 on a 4-drive raid5 array is 20MB/Sec. I've GOT to be doing something wrong. -- Bowie

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Welcome to the team
by Lance Davis 13 Oct '06

13 Oct '06

I would like to formally welcome Matthew Martz to the CentOS team, he has volunteered to take on the role of Mirror Administrator, so hopefully things will get done quicker now we have a dedicated person and I would like to express all of our thanks to Matthew for stepping in to this role. If you are interested in volunteering to help with CentOS and have skills that you think we need , take a look at http://wiki.centos.org/HowToContribute and see if there are things there that you could help with - we will try to keep the list up to date. Regards Lance Davis CentOS Project Leader -- uklinux.net - The ISP of choice for the discerning Linux user.

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Recommend dedicated CentOS hosting?
by Gustaf Alströmer 13 Oct '06

13 Oct '06

Hello, Can anyone recommend a pure dedicated US-based hosting with CentOS support? Prefeably one that is flexible when you need to scale the system. Anywhere I can find user-reviews? Thanks, Gustaf

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RE: [CentOS] Write performance with 3ware 9550
by Bowie Bailey 13 Oct '06

13 Oct '06

chrism(a)imntv.com wrote: > Kirk Bocek wrote: > > I saw a definite improvement by turning off NCQ and setting StorSave > > to 'Balanced.' Are these 1.5GB/Sec or 3.0GB/Sec SATA drives? During > > my testing I changed from non-interleaved memory and 1.5GB to > > interleaved and 3.0GB. Made a big difference in bonnie++ results. > > Unfortunately, I can't say which was more important. > > > > If you have the patience, read through my recent (but lengthy) > > thread on the 3Ware 9550 titled "Calling All FS Fanatics." There's > > a lot of good info from many helpful people. I've only gotten full > > performance using JFS or XFS. > > > > I'm doing this from memory as the machine is at another location now. > I think I did this: > > turned off ncq (per Josh's suggestion) Tried that, it made a small improvement (see my previous post). > turned on write caching (it's on an oversized ups and the data isn't > critical) Write caching is on. I've got a BBU, so the data is protected. > set storsave to "performance" I prefer to leave this one as is to take advantage of the write journaling. > changed the memory interleave (thanks to kirk's suggestion). It was > off by default. This one I would like to try. Can you tell me where I can make the change? > used parted to create gpt disklabel What is the advantage of gpt over msdos? Can I make this change without recreating the filesystem? > set noatime and one other option that was suggested here for the RAID > partition Anyone know if noatime is recommended for a filesystem containing an Oracle database? What was the other option? > used mke2fs -j -b 4096 /dev/blah I used 'mkfs.ext3 /dev/blah'. It created 4K blocks. > That was it. > > Also, I tried the same array as a RAID0 device on the same box and the > performance was approximately the same (maybe ever so slightly > faster). Raid0 should be faster, particularly with writes since it doesn't have to calculate parity. -- Bowie

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Discuss October 2006