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Strange system hangs
by Alfred von Campe 27 Nov '06

27 Nov '06

I've had a couple of complete system hangs on two different systems in the last couple of weeks. The first time it happened I shrugged it off, but now that it has happened a second time on a different system I need to investigate this a bit. further All the systems are identical: IBM (Lenovo) ThinkCentre M52 with 3GB of memory, running CentOS 4.4 with all the recent updates. The systems are currently running the 2.6.9-42.0.3.EL kernel (IIRC, the first hang happened with the 2.6.9-42.0.2.EL kernel). When it occurs, the system is completely hung. Whatever was on the screen at the time continues to be displayed, but the machine doesn't respond to pings (so you can't ssh into it), the mouse is frozen, you can't get to the alternate consoles (Ctrl-Alt-F1), etc. In other words, the only recourse is a reboot. There is absolutely nothing in /var/ log/messages or any other log files that I could find after the reboot. In both cases, the users report that they were editing a file when it happened (they weren't even trying to write out changes to disk). Anybody else seen anything similar to this? Any recommendations on how to capture all relevant information should this occur again? How would you debug a problem like this? Alfred

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Port multiplier support in megaraid* module for LSI LOGIC LSI00042 PCI-X SATA II Controller?
by Mike Fedyk 27 Nov '06

27 Nov '06

I have tried many permutations of search terms in google and I haven't been able to find any confirmation that the megaraid* modules in centos4 supports port multipliers/multiplexers. Here is a link to the controller I have in mind at newegg: http://www.newegg.com/product/product.asp?item=N82E16816118032 In case anyone is interested, here is what my research has turned up when looking for external JBOD SATA enclosures: I'm just looking for a hot swap JBOD enclosure, so anything over $1000 USD is out of the question. Luckily, I found a few meeting that criteria. The DS-1220 is rackmountable, holds 12 drives and uses two port multipliers. The only drawbacks I can see is that it looks like they could've fit 15 drives with three multipliers, and two drives need direct connections to the controller. That's 4 esata ports used ( 2 x 5 port multiplier + 2 direct to hard drive ). http://www.norcotek.com/item_detail.php?categoryid=8&modelno=DS-1220 The SC-SATA12RM is rackmountable, uses 4 multi-lane SAS connectors and holds 12 drives. Having full bandwidth to each drive can have its advantages for streaming reads and writes, but the seeky workload I expect won't benefit much from the extra theoretical bandwidth. In order to save on sata controller port usage, I'd probably have to get a few port multipliers. http://www.pc-pitstop.com/sata_enclosures/scsata12rm.asp The SC-SAT10PM holds 10 drives, uses two port multipliers, connects to the SATA HBA with 2 esata connections (and may be rack mountable with some customizations -- I need to check further). Because of the area the server and storage will be in, the enclosure doesn't strictly need to be rack mountable. http://www.pc-pitstop.com/sata_enclosures/ Here are some links to esata to sata, sata multilane/sas to four internal sata ports, etc. port converters: http://www.satacables.com/html/sata-pci-brackets.html http://www.cooldrives.com/intoexes4pop.html http://www.lycom.com.tw/ST130.htm

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Centos 4.3 32 bit -CIFS VFS: Send error in Close = -9
by Shanti kishore Balusu 27 Nov '06

27 Nov '06

Hello Guys I am facing a problem using cifs filesytem on centos 4.3 32 bit to connect to remote shares.we have DAS(Dell md1000) connected to a Dell 2950(win 2003 std).let me descibe the proc which i followed to access thi DAS via 2950.. 1) create a normal user account on Dell2950(win 2003) create 3 folders with names mysqhare1,myshare2,myshare3 in the storage area and assign all permissions to the newly created user(duser).right click newly created folder share them remove all accounts execpt admin & newly created user & assign full permissions to that share to newly created user(duser) 2) proc used to access shares via cifs wget http://pserver.samba.org/samba/ftp/cifs-cvs/mount.cifs mv mount.cifs /sbin/mount.cifs chmod +x /sbin/mount.cifs mount.cifs //MYDAS/Myshare1 /var/www/html/Myshare1 -o username=duser,password=mydpass,rw mount.cifs //MYDAS/Myshare2 /var/www/html/Myshare2 -o username=duser,password=mydpass,rw mount.cifs //MYDAS/Myshare3 /var/www/html/Myshare3 -o username=duser,password=mydpass,rw Note: MYDAS is pointed to the correct IP in /etc/hosts service httpd stop service httpd start We server flv files from these shares ie a kind of progressive download server(flv streaming using phpflv player) when i start serving files i keep getting the below errors in my dmesg & /var/log/messages.after a few hours of serving server totally hangs(not accessible via ssh) & has to be hard rebooted manully CIFS VFS: Send error in Close = -9 CIFS VFS: Send error in Close = -9 CIFS VFS: Send error in Close = -9 CIFS VFS: Send error in Close = -9 CIFS VFS: Send error in Close = -9 CIFS VFS: Send error in Close = -9 CIFS VFS: Send error in Close = -9 CIFS VFS: Send error in Close = -9 CIFS VFS: Send error in Close = -9 CIFS VFS: Send error in Close = -9 CIFS VFS: Send error in Close = -9 CIFS VFS: Send error in Close = -9 CIFS VFS: Send error in Close = -9 CIFS VFS: Send error in Close = -9 CIFS VFS: Send error in Close = -9 CIFS VFS: Send error in Close = -9 CIFS VFS: Send error in Close = -9 CIFS VFS: Send error in Close = -9 CIFS VFS: Send error in Close = -9 CIFS VFS: Send error in Close = -9 CIFS VFS: Send error in Close = -9 TCP: Treason uncloaked! Peer 80.235.63.248:64721/37374 shrinks window 1814256320:1814257772. Repaired. TCP: Treason uncloaked! Peer 80.235.63.248:64721/37374 shrinks window 1814256320:1814257772. Repaired. TCP: Treason uncloaked! Peer 196.29.40.33:42283/80 shrinks window 1747071341:1747071342. Repaired. TCP: Treason uncloaked! Peer 196.29.40.33:42283/80 shrinks window 1747071341:1747071342. Repaired. TCP: Treason uncloaked! Peer 200.219.181.142:42319/80 shrinks window 2850231833:2850231834. Repaired. TCP: Treason uncloaked! Peer 80.72.16.157:25598/80 shrinks window 3404607524:3404607525. Repaired. TCP: Treason uncloaked! Peer 69.71.145.10:61695/80 shrinks window 588793866:588793867. Repaired. TCP: Treason uncloaked! Peer 69.71.145.10:61695/80 shrinks window 588793866:588793867. Repaired. TCP: Treason uncloaked! Peer 69.71.145.10:61427/80 shrinks window 1127016461:1127016462. Repaired. TCP: Treason uncloaked! Peer 69.71.145.10:61427/80 shrinks window 1127016461:1127016462. Repaired. TCP: Treason uncloaked! Peer 69.71.145.10:61427/80 shrinks window 1127016461:1127016462. Repaired. TCP: Treason uncloaked! Peer 69.71.145.10:64133/80 shrinks window 1285353070:1285353071. Repaired. TCP: Treason uncloaked! Peer 69.71.145.10:64133/80 shrinks window 1285353070:1285353071. Repaired. TCP: Treason uncloaked! Peer 69.71.145.10:61417/80 shrinks window 1339027766:1339027767. Repaired. TCP: Treason uncloaked! Peer 209.198.241.58:1588/80 shrinks window 1933324239:1933324240. Repaired. TCP: Treason uncloaked! Peer 209.198.241.58:1588/80 shrinks window 1933324239:1933324240. Repaired. TCP: Treason uncloaked! Peer 209.198.241.58:1624/80 shrinks window 1932659556:1932659557. Repaired. TCP: Treason uncloaked! Peer 209.198.241.58:1638/80 shrinks window 1940233619:1940233620. Repaired. TCP: Treason uncloaked! Peer 209.198.241.58:1674/80 shrinks window 1940660229:1940660230. Repaired. TCP: Treason uncloaked! Peer 209.198.241.58:1696/80 shrinks window 1958796647:1958796648. Repaired. TCP: Treason uncloaked! Peer 62.68.71.146:2892/80 shrinks window 2790037614:2790037615. Repaired. TCP: Treason uncloaked! Peer 62.68.71.146:2892/80 shrinks window 2790037614:2790037615. Repaired. TCP: Treason uncloaked! Peer 62.68.71.146:2892/80 shrinks window 2790037614:2790037615. Repaired. TCP: Treason uncloaked! Peer 203.81.202.13:58537/20 shrinks window 3133631691:3133633151. Repaired. TCP: Treason uncloaked! Peer 62.68.66.170:10684/80 shrinks window 3483220098:3483220099. Repaired. TCP: Treason uncloaked! Peer 62.68.66.170:10685/80 shrinks window 3482623769:3482623770. Repaired. TCP: Treason uncloaked! Peer 62.68.66.170:10684/80 shrinks window 3483220098:3483220099. Repaired. TCP: Treason uncloaked! Peer 62.68.66.170:10685/80 shrinks window 3482623769:3482623770. Repaired. TCP: Treason uncloaked! Peer 62.68.66.170:10684/80 shrinks window 3483220098:3483220099. Repaired. TCP: Treason uncloaked! Peer 62.68.66.170:10685/80 shrinks window 3482623769:3482623770. Repaired. TCP: Treason uncloaked! Peer 62.68.66.170:10735/80 shrinks window 3577903330:3577903331. Repaired. TCP: Treason uncloaked! Peer 62.68.66.170:10735/80 shrinks window 3577903330:3577903331. Repaired. TCP: Treason uncloaked! Peer 62.68.66.170:10740/80 shrinks window 3591049537:3591049538. Repaired. TCP: Treason uncloaked! Peer 62.68.66.170:10740/80 shrinks window 3591049537:3591049538. Repaired. TCP: Treason uncloaked! Peer 62.68.66.170:10746/80 shrinks window 3602348201:3602348202. Repaired. TCP: Treason uncloaked! Peer 62.68.66.170:10740/80 shrinks window 3591049537:3591049538. Repaired. TCP: Treason uncloaked! Peer 62.68.66.170:10746/80 shrinks window 3602348201:3602348202. Repaired. TCP: Treason uncloaked! Peer 62.192.136.18:61855/80 shrinks window 1829344868:1829344869. Repaired. TCP: Treason uncloaked! Peer 62.192.136.18:64129/80 shrinks window 1834509995:1834509996. Repaired. TCP: Treason uncloaked! Peer 62.192.136.18:64129/80 shrinks window 1834509995:1834509996. Repaired. please help me find a sollution for my above problem.. below are the hardware & os details.. Hardware Dell1850 with 4 gig mem OS: Centos 4.3 32 bit please find the detailed logs.zip in the attached zip file.. Thanx & Regards Kishore Chowdary

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Which greylisting milter?
by Zyxian 27 Nov '06

27 Nov '06

Howdy. Over at http://greylisting.org/implementations/sendmail.shtml they list 5 different implementations - 1 perl and 4 C based. Does any one know if one is better than the other? Does it make a difference? Is it just a matter of preference? Thanks. Zyxian _________________________________ I learn more when something goes wrong...

1 0

ISCSI SAN suggestion
by Radu Radutiu 27 Nov '06

27 Nov '06

Sorry for the off-topic question but I need advice on a buying a ISCSI SAN for 4-6 servers running CentOS 4.4 .The main purpose for the SAN is to store email accounts (that will be accessed by imap - dovecot) and other documents. Minimal redundancy is required (e.g. dual power supplies, battery backed write cache or mirrored controllers) and price for a 2 TB configuration should be under $ 10000. Right now the short list includes Promise VTrack M300i and Dell/EMC AX150i. Do you have any experience with any of these models or can recommend a similar SAN that will meet the above requirements? Regards, Radu

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RE: [CentOS] postfix - hostname
by Alex Palenschat 27 Nov '06

27 Nov '06

> On 11/25/06, R Lists06 <lists06(a)abbacomm.net> wrote: > > > From: Guillermo Garron > > > Hi, > > > I have this problem > > > my email server's DNS name is > > > ns1.mydomain.com, and it is registered in the reverse DNS > also with > > > that name, when i installed my server at the hostname i entered > > > centos-server.mydomain.com when i tried to send an email from the > > > root console with > > > > > > # mail root > > > > > > the email is returned saying that > > > > > > root(a)centos-server.mydomain.com, could not be verified > > > > > > i used the command > > > # hostname ns1.mydomain.com > > > and also edited the file. > > > > > > /etc/hosts, > > > but i have the same result, the hostname did not change, i even > > > restart my server with no luck. what am I missing? > > > regards, > > > Guillermo. > > > PS my server is a CentOS 4.4, with postfix > > > Guillermo Garron The hostname is stored in /etc/sysconfig/network and when you are dealing with postfix there is a line in the /etc/postfix/main.cf file that needs to be edited that starts with myorigin= alex

1 0

grep from /
by R Lists06 27 Nov '06

27 Nov '06

Interesting If someone tries to grep a whole Centos 4 server as root from / for a single word, will you see errors like this? :-) WARNING: Kernel Errors Present Buffer I/O error on device fd0p10...: 51 Time(s) Buffer I/O error on device fd0p11...: 51 Time(s) Buffer I/O error on device fd0p12...: 51 Time(s) Buffer I/O error on device fd0p16...: 102 Time(s) Buffer I/O error on device fd0p24...: 51 Time(s) Buffer I/O error on device fd0p28...: 51 Time(s) Buffer I/O error on device fd0p32...: 51 Time(s) Buffer I/O error on device fd0p4,...: 102 Time(s) Buffer I/O error on device fd0p44...: 51 Time(s) Buffer I/O error on device fd0p48...: 102 Time(s) Buffer I/O error on device fd0p52...: 51 Time(s) Buffer I/O error on device fd0p56...: 51 Time(s) Buffer I/O error on device fd0p76...: 204 Time(s) Buffer I/O error on device fd0p8,...: 51 Time(s) Buffer I/O error on device fd0p84...: 51 Time(s) Buffer I/O error on device fd0p92...: 51 Time(s) :-) - rh -- Robert - Abba Communications Computer & Internet Services (509) 624-7159 - www.abbacomm.net

4 3

Looking for assistance
by System Admin 27 Nov '06

27 Nov '06

We have about 5 servers spread out throughout the country: 2 Centos 4.4, 1 Red Hat and 2 windows machines- looking for some good ideas for a back-up solution. Our servers hold a lot of data, but only a small portion of it is crucial on any given day. That crucial portion is always changing (for example, this week the crucial files all relate to November- current and previous projects, and the next project in early December). What we need to have is a backup solution that would allow us to roll back to any given day (about four weeks of daily history). Bare-metal backups are a must. Our ideal solution would be to find someone who could design and implement a system for us. All ideas and suggestions are welcome.

9 8

CentOS default accounts in /etc/passwd
by Paul Stepowski 26 Nov '06

26 Nov '06

Hi, I've noticed that the /etc/passwd file on CentOS 4.4 contains the users: sync, shutdown, and halt. The users' shells are set to /bin/sync, /sbin/shutdown, and /sbin/halt respectively. What are these accounts used for? Thanks, Paul

1 0

SATA Native Command Queuing
by Matt 26 Nov '06

26 Nov '06

Does CentOS support NCQ on SATA drives? If so is there something I must do to turn this support on? Matt

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