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Re: Opteron Mobo Suggestions
by Bryan J. Smith <b.j.smith＠ieee.org> 23 Jun '05

23 Jun '05

From: Peter Farrow <peter(a)farrows.org> > I had trouble with Tyan boards and BIOS revisions not getting Processor > numbers and speeds correct. > We also had early life failures with Asus boards, and since switched to > MSI, we now use the MSI 9161 > K8D Master 3 > http://www.msi.com.tw/program/products/server/svr/pro_svr_detail.php?UID=560 > without any problems.. Ack, no block diagram in MSI's manual. It's an AMD8131+AMD8111, no HyperTransport tunnel for any video channels. So you can probably assume AMD8111 bridge attached to AMD8131 tunnel to CPU #0. Since there is only one high-speed tunnel, you really can't get more optimal than adding another HT tunnel chip. I guess I'm just looking for the "holy grail" in (2) AMD813x's on a 2-way board. -- Bryan J. Smith mailto:b.j.smith@ieee.org

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Postfix problem with DNS
by Jakub Wojtanowski 23 Jun '05

23 Jun '05

Today I have changed my DSL modem and problems with postfix begun. It receives mail, but cannot send any. In logs I can read Jun 22 19:39:53 server postfix/smtp[5040]: 9A51711FF85: to=address(a)somedomain.com, relay=none, delay=12840, status=deferred (Host or domain name not found. Name service error for name=somedomain.com type=MX: Host not found, try again) My resolv.conf is proper. I can ping any server, but postfix cannot see them. What can I do ? Postfix 2.1.5 Best Regards Kuba ---------------------------------------------------------------------- OMNIXMAIL! Jesli masz telefon w sieci Era i dostep do WAP, to mozesz na komorce odbierac poczte ze wszystkich swoich kont poczty e-mail! OMNIXMAIL jest w Era Omnix: http://link.interia.pl/f1896

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NTFS patitions in CentOS
by Dominik Składanowski 23 Jun '05

23 Jun '05

Hi, I tried to mount NTFS partitions to my CentOS installation. The message is: "mount: fs type ntfs not supported by kernel" Is any possibility to mount it? Maybe I should load some kernel module? Regards -- ____________________________________________________________________ D o m i n i k S k ł a d a n o w s k i

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Re: Opteron Mobo Suggestions
by Bryan J. Smith <b.j.smith＠ieee.org> 23 Jun '05

23 Jun '05

From: Chris Mauritz <chrism(a)imntv.com> > If you have a task that's I/O bound, then perhaps Bryan's concerns will > impact your decision on a motherboard. For my purposes, I'm mostly cpu > bound, Then it doesn't apply. > it really doesn't mean a hell of a lot to me that one cpu is > "stuck" with mundane I/O tasks. And as cpus get faster and faster, > this becomes less of an issue (if it's really an issue at all for most > tasks). That's not it at all. It has nothing to do with CPU performance. It has everything to do with interconnect and the processor affinity with regards to I/O and memory mapped transfers. > Also, as Bryan mentions, the S2895 splits the I/O up a bit > better and the newer revs of that board support dual core Opterons > too. Technically, all mainboards should support dual-core Opterons. But the market reality is why give consumers a BIOS update when you can charge for a new mainboard? ;-> Dual-core A64/Opterons don't change the interconnect one bit. Dual-core Xeons/P4s are a whole different story. > So if you're in an I/O heavy environment you could choose that > board rather than the S2882. Assume you could make use of one of the PCIe x16 slots for a storage or other communications device, as well as the 2nd NIC. -- Bryan J. Smith mailto:b.j.smith@ieee.org

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Re: Opteron Mobo Suggestions
by Bryan J. Smith <b.j.smith＠ieee.org> 23 Jun '05

23 Jun '05

From: Kirk Bocek <t004(a)kbocek.com> > I've been planning to build a dual Opteron server for awhile. > I'd like to get people's suggestions on a suitable motherboard. I assume you read 2004 November Sys Admin on the Opteron, including avoiding cheap mainboard designs? http://www.samag.com/documents/sam0411b/ Specifically figure 6 for a 2-way mainboard: http://www.samag.com/documents/s=9408/sam0411b/0411b_f6.htm > I've looked at the Tyan K8SE (S2892) and K8SRE (S2891) but would > like to find more Linux-specific experiences with these boards. On 2-way, you want one with an AMD8131 (or AMD8132) HyperTransport PCI-X 1.0 (2.0) tunnel. On 4-way, you want one with at least 2 such tunnels. I assume you want 2-way. The S2891 is a nice, 2-way board for 1/2U. The S2892 is nice if you want more of a traditional SSI EEB mainboard. They are true NUMA and don't cut corners on the CPU and memory. _But_, unfortunately _both_ mainboards put _all_ I/O on CPU #1. That's not ideal. As such, you might be better of going with the S2895 which puts the nForce Pro 2050 and 1 GbE NIC on CPU #2, at least if you have a PCIe storage or NIC cards. It looks more like a workstation board, but the fact that 1 embedded GbE NIC _and_ 1 PCIe slot is on CPU #2 helps improve processor affinity for I/O (especially under Solaris, but even Linux to an extent as well). Tyan continues to disappoint me by putting _all_ I/O on 1 CPU. The only option where they don't is the nForce Pro 2200+2050 combination on the S2895 where the 2050 goes on CPU #2. Tyan should put the AMD8131 on CPU #2 on the 2891/2892 so it doesn't contend with the nForce 2200 on CPU #1 and its slots/peripherals (and there is no 2050). > Some features I expect are at least 4 SATA (SATA-300?) ports, ??? Why "dumb" SATA channels ??? Why not a 3Ware Escalade 8506-4+ or a LSI Logic MegaRAID 300-8X? > serial console support in the BIOS, Any PhoenixBIOS will typically give you that. > USB 2.0 and IEEE-1394 ports, On a server? The last thing you want is any storage over those two. I've been ripping out a lot of external storage solutions that use USB 2.0 or IEEE-1394 because they put server stability at risk. > low-end on-board video. Most low-footprint mainboards have video on-mainboard these days. Typically just glued to a PCI bus. > Anyone care to share their experiences? Just curious why you want "dumb" SATA channels, let alone external storage over USB or FireWire on a _server_. -- Bryan J. Smith mailto:b.j.smith@ieee.org

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Automated YUM update kills DNS
by Jeff Lasman 23 Jun '05

23 Jun '05

We've got several CentOS 3.x systems running DNS that we keep updated automatically via YUM. Recently two of those systems (not all of them) when updating themselves to the latest versions of BIND, automatically replaced /etc/named.conf with a new one and saved the old one as /etc/named.conf.rpmsave. Which of course broke DNS for those servers. All servers got updated, but only two of them did the rewrite. Any ideas as to why it might have happed, or how to make sure it doesn't happen again? Hopefully nothing so simplistic as "exclude bind from auto updates" though if that's the only answer, we'll take it. Thanks. Jeff -- Jeff Lasman, Nobaloney Internet Services 1254 So Waterman Ave., Suite 50, San Bernardino, CA 92408 Our blists address used on lists is for list email only Phone +1 909 266-9209, or see: "http://www.nobaloney.net/contactus.html"

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Re: [CentOS] Re: Opteron Mobo Suggestions
by Bryan J. Smith <b.j.smith＠ieee.org> 22 Jun '05

22 Jun '05

From: Kirk Bocek <t004(a)kbocek.com> > Yea, but who *is* this guy? :) I heard he is a jerk. ;-ppp > Don't really need physical 4-way. > I'm planning on 2-way dual core. On a server where throughput is king, everything is I/O. Dual-core just gives you more computing. > I mostly just want to see how two or three striped SATA drives will > perform. If the on-board ports don't perform, I can always add a > separate controller later. My understanding is that NCQ support isn't > here yet for Linux but that it should provide a boost. Do you understand what NCQ does? It allows an intelligent drive to queue for the bus, because the bus is dumb. So what do you think an intelligent strorage controller does? (light bulb!) 3Ware Escalade 7000/8000s are the undesputed king of queuing in ATA. You can't beat real-time ASIC+SRAM queuing! It can service requests faster than anything. That's why 3Ware calls it a "storage switch," because it's like having a "layer 3 switch" instead of a "layer 3 router" (traditional microcontroller+DRAM). And it's _ideal_ for RAID-0, 1 and 10. > Not for primary storage. Mostly just future proofing here. Throw in a $10 card. Besides, they all come with it these days. > I've been meaning to setup a backup system using external hard > drives instead of tape. That wouldn't fly over USB 1.1. Put in an out-of-band GbE card or iSCSI HBA instead. Trust me on this, you do _not_ want USB or FireWire. > So, Brian, having given me all that good information (thanks again), > what specific models do you suggest? What are *you* running on? I like the HP DL385 (2-way) and DL585 (4-way) servers. They use the reference AMD designs -- including (2) AMD813x's in the DL585: http://www.samag.com/documents/s=9408/sam0411b/0411b_f5.htm Do you need 4-way for computation? Or throughput? If the latter, then dual-core on 2-way is not going to give you anything. -- Bryan J. Smith mailto:b.j.smith@ieee.org

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Re: [CentOS] Re: Opteron Mobo Suggestions
by Bryan J. Smith <b.j.smith＠ieee.org> 22 Jun '05

22 Jun '05

From: Peter Arremann <loony(a)loonybin.org> > Bryan, > there are sometimes more important things than max performance... > Upgradability i.e. ... If you buy a complete server its one thing, but if > you're offering parts and people build there own they often do consider > upgradability. If you buy a server that right now should run fine with 1 CPU > but you want to upgrade later to a second one, then the Tyan design is for > you. This way you can run all your I/O still and still not have to pay extra > for the second CPU up front. The Tyan website even mentions this somewhere as > the reason for the design decision. And I understand this. And I understand why Tyan might offer it on _some_ models. But not _all_ models. ;-> That's what I can't believe. -- Bryan J. Smith mailto:b.j.smith@ieee.org

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Re: [CentOS] Re: Opteron Mobo Suggestions
by Bryan J. Smith <b.j.smith＠ieee.org> 22 Jun '05

22 Jun '05

From: Ugo Bellavance <ugob(a)camo-route.com> > I don't really know, but you could get a pretty cheap NAS with a gigabit > nic to do your backups instead of using USB/Firewire. And then attach any tape or other media library to that. There is this farce out there among sysadmins that they have to do backups to tape or other media in "real-time" during a time-limited "window." No, no, no, no, NO! REALITY: You only need to send the data in real-time during the window to a "buffering" system that actually then commits it to tape or other media at _any_ time it chooses. BONUSES: - I can send just a "differential" to that system, instead of a full filesystem dump (even if I want a "full" backup ;-). - I can restore from that "near-line" system whenever I want (assuming it is still on-line) - many others ... This is what has now evolved into the concept of a "virtual tape library." A near-line storage device that buffers between end systems that have limited backup windows and the tape (or other media) you may or may not need to always commit to. Be sure to get 2005 September Sys Admin. ;-> -- Bryan J. Smith mailto:b.j.smith@ieee.org

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Re: [CentOS] Centos 3 - yum update error (rpm-libs)
by thorsten＠uni.de 22 Jun '05

22 Jun '05

>Are you doing the switch now or are you upgrading CentOS after an >already good switch? I switch sometime ago. With no Problems until this problem with rpm now. >Here is a link with specific info: >http://www.centos.org/modules/smartfaq/faq.php?faqid=19 I switch following this instruction. Now I have this: :-( # rpm -qa | grep -i rpm- rpm-python-4.2.3-21_nonptl rpm-libs-4.2.3-13.WB2 rpm-python-4.2.3-13.WB2 rpm-4.2.3-21_nonptl rpm-4.2.3-13.WB2 rpm-libs-4.2.3-21_nonptl

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