Discuss February 2009

discuss@lists.centos.org

251 participants
224 discussions

ext3 heavy file fragmentation with NFS write
by Andrzej Szymański 04 Mar '09

04 Mar '09

Hello, Does anybody know how to avoid the file fragmentation when a file is created over NFSv3? A file created locally is OK: dd bs=32k if=/dev/zero of=test count=32x1024 conv=fsync filefrag test test: 10 extents found, perfection would be 9 extents When I create the file in the same dir, but from another machine, mounted over NFS: filefrag test test: 4833 extents found, perfection would be 9 extents With such a file a sequential read is quite slow (~76MB vs >200MB on my raid card). I can just suspect that this is a problem of block allocation when the same file is appended by different processes (8 NFS threads). I've tried mounting ext3 with -o reservation and switch to NFS over TCP, with no improvement. Both systems are Centos 5.2 with kernel 2.6.18-92.1.22.el5 The ext3 is mounted with rw,nosuid,nodev,usrquota,grpquota,acl NFS export: rw,sync,no_root_squash 8 NFS threads. Remotely mounted with options rw,intr,nfsvers=3,proto=udp,rsize=32768,wsize=32768 I would be very grateful for any help. Andrzej

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(a) WinPower RPM available? (b) where to install if use tar.gz file?
by Lanny Marcus 02 Mar '09

02 Mar '09

Two quick and simple questions; I want to install the "WinPower" software for my new UPS. On their web site, they have a tar.gz file available for download. I know the reasons for staying with RPM, if at all possible. I've Googled and Yahood for ""WinPower"+RPM+Linux and get hits, but no obvious RPM. I tried "yum install winpower" and the response was "no package winpower available" (rpmforge is one of the yum repositories I use, so it's not there, with that name). (a) Is an RPM available for it? (If so, where and what's the name?) (b) If I need to download the tar.gz file and install from that, it looks from their documentation that they install into /opt/MonitorSoftware Is it better to install into /usr/local or into /opt? What is the recommendation for a CentOS box, when installing non RPM software? Where best to install non RPM stuff? TIA!

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TIME_WAITs...
by John Doe 02 Mar '09

02 Mar '09

Hi, I was asked to check some TIME_WAITs "problems" (my boss thinks there should almost never be any) and I bumped into something strange... All of our servers have apparently normal (in my opinion) 60s TIME_WAITs (even if it strangely caps around 14000 in my tests)... But one of them behaves differently (and my boss thinks it is the normal behavior). If I make 10000 rapid connections/selects/deconnections to mysql on this server, I get like 1 TW after around 3000, another TW around 6000 and another TW around 9000... That makes 3 TWs only. And they last 60 seconds... I am told this server was not really setup differently (no custom kernel). All servers are CentOS 5.2, kernels 2.6.18-92.1.[22|10].el5. I compared the values in sysctl.conf and /proc/sys/net/ipv4/* and nothing different. So, am I correct in thinking that seeing thousands TWs when there was a burst of thousands connections is normal? Any idea why so few TWs on this server? Any conf file I should check? # cat /proc/sys/net/ipv4/tcp_fin_timeout 60 # cat /proc/sys/net/ipv4/tcp_max_tw_buckets 180000 # cat /proc/sys/net/ipv4/tcp_tw_recycle 0 # cat /proc/sys/net/ipv4/tcp_tw_reuse 0 When I googled for it, many people were pointing to the tcp_fin_timeout value ... Is it really related to TWs? Thx, JD

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mailscanner installation - centos 5.2 - rpmforge + vanderkooij rpms
by Linux Advocate 01 Mar '09

01 Mar '09

Guys, i have just installed ( after reading the docs on the mailscanner site and centos lists ) Mailscanner, and was wondering.... a.) How do i test my installation? is there some sample spam/ virus messages that can be used to test. b.) MailScanner -V shows; b.1) LibClamAV Warning: ************************************************** LibClamAV Warning: *** The virus database is older than 7 days! *** LibClamAV Warning: *** Please update it as soon as possible. *** LibClamAV Warning: ************************************************** how do i update this database? b.2) there are some modules missing; how do i iinstall them or do i ignore them Module versions are: 1.00 AnyDBM_File 1.16 Archive::Zip 0.17 bignum 1.04 Carp 1.42 Compress::Zlib 1.119 Convert::BinHex missing Convert::TNEF <--- missing ? 2.121_08 Data::Dumper 2.27 Date::Parse 1.00 DirHandle 1.05 Fcntl Optional module versions are: 1.30 Archive::Tar 0.17 bignum missing Business::ISBN <---- missing ? missing Business::ISBN::Data missing Data::Dump 1.814 DB_File 1.14 DBD::SQLite 1.52 DBI 1.14 Digest 1.01 Digest::HMAC 2.36 Digest::MD5 2.11 Digest::SHA1 missing Encode::Detect missing Error missing ExtUtils::CBuilder missing ExtUtils::ParseXS regards, mgomez.

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gnet-2.0, gio-2.0
by Ondrej Filip 28 Feb '09

28 Feb '09

Hello, I'm porting one project to centos where we use gnet and gio libraries. Will be these libraries part of centos in future? I'm not sure what relationship is between these libraries and glib. Regards Ondrej Filip

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simple if statement
by Tom Brown 28 Feb '09

28 Feb '09

Hi Below if $remaining is empty i want the if to finish - what is it i need to put in SOMETHING? if [ "$remaining" = "" ] ; then SOMETHING ; else kill -9 $remaining fi thanks?

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centos 5.2 - latest rpms for mailcanner , clamav and spamassassin
by Linux Advocate 28 Feb '09

28 Feb '09

Guys, What repo has rpms for mailscanner, clamav and spamassasin?

7 8

how can enable in mutltpath?
by chloe K 28 Feb '09

28 Feb '09

Hi all How can I enable CONFIG_IP_ROUTE_MULTIPATH_CACHE to support multi path Thank you --------------------------------- Be smarter than spam. See how smart SpamGuard is at giving junk email the boot with the All-new Yahoo! Mail

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Repo order - priority plugins
by Linux Advocate 28 Feb '09

28 Feb '09

Guys, what is the best way of arranging the repos with regards to their priority? Any ideas, especially for all non base ones? /etc/yum.repos.d/CentOS-Base.repo - priority = 1, 2 /etc/yum.repos.d/atrpms.repo /etc/yum.repos.d/epel.repo /etc/yum.repos.d/kbs-extras.repo /etc/yum.repos.d/kbs-misc.repo /etc/yum.repos.d/rpmforge.repo How would we position dags repo?

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Re: [CentOS] HylaFax and Com Ports
by James B. Byrne 28 Feb '09

28 Feb '09

On Thu, Feb 26, 2009, Joseph L. Casale wrote: > I need to setup HylaFax which leads to my first question, anyone > got an opinion on whether or not to use HylaFax or HylaFax+? We use Hylafax together with Avantfax and are very pleased with the results. I cannot speak to HylaFax+ . We also use MultiTech MT5634ZBAs and have been very pleased with them as well. They must be ten years old by now. Avantfax is well worth a look if you are considering a web based solution for end user access to hylafax. -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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Discuss February 2009