Discuss April 2006

discuss@lists.centos.org

257 participants
318 discussions

Best Partitioning Tool?
by Mark Sargent 11 Apr '06

11 Apr '06

Hi All, which is the best tool for partitioning, as I forgot to bring in my copy of PartitionMagic(DOH!!) and need to resize an NTFS partition today. I'm using XP Pro at the moment. I wish to resize a 38GB partition, primary, to 20GB and use the rest for a Linux Install(CentOS 4-3). Cheers. Mark Sargent. P.S. I can't use my normal account whilst at work, so subscribed from my work account. Is that breaking any list rule, and if so, what's the work around?

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athlon64/opteron 8GB per CPU
by David Thompson 10 Apr '06

10 Apr '06

I'm putting together a spec for a big(ger) memory x86_64 host, and I hope some of you-all can help. I'm looking for success stories of hardware that folks are using in production environments, preferably with CentOS 4, with more than 4GB of memory per CPU. I know there are lots of mobos out there that can do this, but I'm looking for what folks really have running. Call me paranoid. The target is SATA + n*GigE + 1CPU + 8GB memory, and I can consider other configurations. The incumbent system is a Xeon 8GB system running i686 CentOS 4.3 (what else?), with light CPU loading and very heavy IO loading (WD raptors are our friends). Folks with deep(er) knowledge of x86_64 architecture, I'd also be interested in the trade offs between 1CPU w/8GB and 2CPUs each with 4GB. (E.g. what's the real cost of shipping data back and forth between the memory spaces of the two CPUs? How does the 2.6 kernel deal with the split memory space? etc...) The memory is all going to be used up in kernel buffers keeping bits of files in kernel memory. Also, trade offs between Opteron and Xeon architectures, i686 vs. x86_64, bounce buffers, etc., for an application like this would be helpful. The application is enhancement to a mirror server (mirror.cs.wisc.edu) here at UW-Madison. Many thanks to all in advance. Private or public replies welcome. Dave Thompson UW-Madison

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Re: [CentOS] athlon64/opteron 8GB per CPU
by David Thompson 10 Apr '06

10 Apr '06

Jay Lee wrote: > >Why i686? Sure the i386 version of CentOS 4 can access >4gb ram but >it's quite ugly how it has to do it and there are still some limits. >I'd strongly recommend using the x86_64 release if you can pull it off. It's an older Xeon that doesn't have the EMT64 extensions. >Well, if all you're doing is rsync or similar than CPU really isn't >going to be a bottleneck in the near term, bandwidth and I/O are the >bigger bottlenecks. What speed will the network be running at? The traffic is rsync (out; we have another box that grabs content for us), http, and ftp. It's all GigE locally, and BIG pipes to the internet. Before linux distros exploded in size and number, we pushed several hundred gigabit for several days when someone did a release. Dave

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Re: [CentOS] athlon64/opteron 8GB per CPU
by David Thompson 10 Apr '06

10 Apr '06

Joshua Baker-LePain wrote: >On Mon, 10 Apr 2006 at 2:28pm, David Thompson wrote > >I have several Opteron/8GB RAM systems, all running centos-4/x86_64. The >older ones are on Arima HDAMA motherboards, and the newer ones are on >Supermicro H8DAR-T boards. They're very nice systems. Yeah, what's up with SuperMicro and Opteron systems? Looking at their web site, it's like they have disavowed any knowledge of having built anything Opteron. Did they back out of Opteron, or do you have to be a member of a secret society to get to their information? >One caveat with these Supermicro boards is the the onboard SATA (some >sort of Adapted branded Marvell thingy) isn't supported. They offer some >sort of binary download, but we all know how much fun that is. I just put >2 port 3wares in 'em all (they're cluster compute nodes). Sure, it's >expensive for a simple SATA controller. But it's also no fuss and rock >solid. The newer SM boards have HT2000/HT1000 based SATA which centos 4.3 >should support, but I've no experience with 'em. Yeah, I've been there also. We also use alot of threeware in these applications. The other add-in sata that I've used in 3112, but that hasn't always worked. >I don't know how deep my knowledge is, but we run a lot of memory >intensive code on these nodes and get a 2X speedup with dual CPUs. So, >IME, there's not much penalty with the extra hops to get to the other >CPU's memory. Yeah, it's cheaper to buy two CPUs and use 1GB dimms (8 slots) compared to 1 CPU and 2GB dimms (4 slots). But the CPUs aren't going to be loaded (at all), so I'm concerned of hurting throughput by splitting the memory space. Tyan is working on a mobo with 8 slots per CPU (S3892), but my favorite vendors aren't carrying it (yet). Dave

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P3Scan support
by Jens Abraham 10 Apr '06

10 Apr '06

Hello, I want to ask if CentOS will support P3Scan (http://p3scan.sourceforge.net/) as RPM delivered with the distribution? For explanation: P3Scan is an transparent mailproxy. It uses ClamAV and SpamAssassin to distinguish between Spam- Virus- and normal Mail. Its more usefull to get an update via the repos instead of compiling it by myself. I hope you understand my englisch. ;) Greets Jens -- http://core.pnode.de/wordpress/ - Core Blog (offline) "Bis zum Meer für einen Bruder, durch das Meer für eine Geliebte" -Bulgarisches Sprichwort Echte DSL-Flatrate dauerhaft für 0,- Euro*! "Feel free" mit GMX DSL! http://www.gmx.net/de/go/dsl

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Network and default route
by Scott Silva 10 Apr '06

10 Apr '06

I have had this problem on and off since RedHat 6, and I always worked through it, but I thought I would ask. When you have multiple network interfaces, how does the system determine the default route? Or is it the first, (or last) interface that comes up? On the problem systems I have to add a "route add default..." statement in some systems in the rc.local to get them to work right. -- MailScanner is like deodorant... You hope everybody uses it, and you notice quickly if they don't!!!!

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RE: [CentOS] KDE vs Gnome
by Bowie Bailey 10 Apr '06

10 Apr '06

Chris Mauritz wrote: > > Do that many people even use the GUI in a server environment? On the > vast majority of my installs, I don't even include X since the admins > connect via SSH over the net or on the physical console. But perhaps > I'm just not a typical user. I've got the default GUI installed on my > laptop, which appears to be of the Gnome variety. 8-) I install the default Gnome setup on my servers in case I need/want it. Once the server is installed and running properly, I configure the default runlevel to 4 so that the GUI doesn't load under normal conditions. -- Bowie

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rsync and users
by Todd Cary 10 Apr '06

10 Apr '06

Thanks to the encouragement of some people on this list, I am using rsync to synchronize two servers: one is a backup to the other in case the primary one fails. By hand, I inserted the names of the users on the primary server into the backup server. So, now all works well. /usr/bin/rsync -av -e ssh /home/ 192.168.0.22:/home/ My question is what would happen if the users were not on the backup server? Is there anyway to have the users automatically inserted into passwd and group? Todd -- Ariste Software 2200 D Street Ext Petaluma, CA 94952 (707) 773-4523

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Kernel downgrade?
by Remco Barendse 10 Apr '06

10 Apr '06

Hi list! I've been bitten by a bug in the latest kernel 2.6.9-34.EL and I already removed the old kernel. Are old kernels retained at any place? I need to go back to 2.6.9-22.02 but where can I find it? In the Centos 4.3 directory I find only the latest kernel, not the older ones? Thanks!!

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Jazz drive
by Mace Eliason 10 Apr '06

10 Apr '06

Hi We setup a server the other day for a client, and it has a 35gig jazz drive in it. Centos 4.2 recognizes it as a cd disk. How would I go abouts getting it to read and write to it? When I click on the cd-rom disc icon it loads up cd/dvd creator. Shouldn't it just recognize it as an external drive? Thanks

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Discuss April 2006