Discuss September 2009

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300 participants
294 discussions

Excessive NFS operations
by lhecking＠users.sourceforge.net 03 Oct '09

03 Oct '09

Reading the "waiting IOs" thread made me remember I have a similar problem that has been here for months, and I have no sulution yet. A single CentOS 5.2 x86_64 machine here is overloading our NetApp filer with excessive NFS getattr, lookup and access operations. The weird thing is that the number of these operations increases over time. I have an mrtg graph (which I didn't want to attach here) showing e.g. 200 NFS Ops on Monday, measured with filer-mrtg, going up to, e.g. 1200 in a straight line within days. nfsstat -l on the filer proves beyond doubt that the load is caused by this particular machine. dstat shows me which NFS operations are causing it. date/time | null gatr satr look aces ... 10-09 12:22:52| 0 0 0 0 0 10-09 12:22:53| 0 525 0 602 602 10-09 12:22:54| 0 1275 0 1464 1438 10-09 12:22:55| 0 0 0 0 0 10-09 12:22:56| 0 0 0 0 0 10-09 12:22:57| 0 0 0 0 0 10-09 12:22:58| 0 238 0 270 270 10-09 12:22:59| 0 1461 0 1663 1660 10-09 12:23:00| 0 205 0 133 114 10-09 12:23:01| 0 0 0 0 0 10-09 12:23:02| 0 1 0 0 0 10-09 12:23:03| 0 0 0 0 0 10-09 12:23:04| 0 1411 0 1574 1574 10-09 12:23:05| 0 498 0 465 466 10-09 12:23:06| 0 0 0 0 0 10-09 12:23:07| 0 0 0 0 0 10-09 12:23:08| 0 0 0 0 0 10-09 12:23:09| 0 1082 0 1178 1192 10-09 12:23:10| 0 790 0 885 865 This behaviour is somehow tied to the Gnome desktop. I have other machines running CentOS 5.2 x86_64 (at init level 3) which don't show this behaviour. I also have CentOS 5.2 i386 machines which don't show it either. None of the other machines on the lan show it - RHEL3 32 and 64bit, Solaris. What I'd need is a monitoring tool than can tie the NFS ops to process ids or applications. lsof isn't nearly as helpful here as I thought. I even copied this workstation user's files to another account, logged in and ran the same apps - and couldn't reproduce it. Ideas? Essentially, this makes CentOS 64bit undeployable in our environemnt.

12 29

du vs df size difference
by Ryan Pugatch 02 Oct '09

02 Oct '09

Hi all, Curious issue.. looking in to how much disk space is being used on a machine (CentOS 5.3). When I compare the output of du vs df, I am seeing a 12GB difference with du saying 8G used and df saying 20G used. # du -hcx / 8.0G total # df -h / Filesystem Size Used Avail Use% Mounted on /dev/xvda3 22G 20G 637M 97% / I recognize that in most cases du and df are not going to report the same but I am concerned about having a 12GB disparity. Does anyone have any thoughts about this or reason as to why there is a big difference? I have read a few articles online about it and none have really shown such a large difference. Thanks Ryan Pugatch Systems Administrator, TripAdvisor

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Re: [CentOS] Asterisk and VOIP was Re: CentOS for non-tech user
by rb4centos＠gmail.com 02 Oct '09

02 Oct '09

-----Original Message----- From: Brian Mathis The difference is that CentOS is a general-purpose OS that can be used for many things, and has a much bigger installed base. That makes it more of a target and would likely be included in scanning tools. A custom OS running on a PBX might also have vulnerabilities, but it's also probably not a big target because of the diversity of systems out there and relative limited utility one would have if such a system were compromised. That you tend to tend to think of it as an "appliance" running the phone system does not change the fact that it's actually a full-blown server OS with the same issues as other servers. But if you're not connected to the Internet none of of this means anything. CentOS/Asterisk *would* be an appliance under these conditions. There are no "server" vulnerabilities because you're not connected to a LAN. Apologies if this is unreadable. I'm typing on my Centro and I do that very often.

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OT: dmidecode data - what is maximum RAM capacity of this box?
by Lanny Marcus 01 Oct '09

01 Oct '09

In Timo's thread about RAM today, I noticed dmidecode and I got the data for my Dell Dimension 2400 (Celeron CPU) box, which is below. I won this box in a raffle, during February 2005. After I got the box, I got conflicting information, from Crucial.com and from Dell Latin America, regarding the maximum RAM configuration. To be conservative, I bought two 256 MB DIMMS from Crucial.com, early in 2005. Running dmidecode, I got the below information. Questions: (a) Is the maximum capacity of this motherboard 1 GB instead of the 512 MB I thought it was? (b) Is it possible the mainboard capacity is 1 GB, but that the BIOS limits to 512 MB? To add further confusion, I just searched for this model on crucial.com and they are showing 2 GB total capacity. However, they do not allow one to select between the Celeron CPU which I have and a non Celeron CPU and they may have different capacity. TIA! Lanny dmidecode for Dell Dimension 2400 Celeron box Handle 0x1000, DMI type 16, 15 bytes. Physical Memory Array Location: System Board Or Motherboard Use: System Memory Error Correction Type: None Maximum Capacity: 1 GB Error Information Handle: Not Provided Number Of Devices: 2 Handle 0x1100, DMI type 17, 23 bytes. Memory Device Array Handle: 0x1000 Error Information Handle: Not Provided Total Width: 64 bits Data Width: 64 bits Size: 256 MB Form Factor: DIMM Set: None Locator: DIMM_1 Bank Locator: Not Specified Type: SDRAM Type Detail: Synchronous Speed: 266 MHz (3.8 ns) Handle 0x1101, DMI type 17, 23 bytes. Memory Device Array Handle: 0x1000 Error Information Handle: Not Provided Total Width: 64 bits Data Width: 64 bits Size: 256 MB Form Factor: DIMM Set: None Locator: DIMM_2 Bank Locator: Not Specified Type: SDRAM Type Detail: Synchronous Speed: 266 MHz (3.8 ns) Handle 0x1301, DMI type 19, 15 bytes. Memory Array Mapped Address Starting Address: 0x00000000000 Ending Address: 0x0001FFFFFFF Range Size: 512 MB Physical Array Handle: 0x1000 Partition Width: 0 Handle 0x1402, DMI type 20, 19 bytes. Memory Device Mapped Address Starting Address: 0x00000000000 Ending Address: 0x0000FFFFFFF Range Size: 256 MB Physical Device Handle: 0x1100 Memory Array Mapped Address Handle: 0x1301 Partition Row Position: 1 Handle 0x1403, DMI type 20, 19 bytes. Memory Device Mapped Address Starting Address: 0x00010000000 Ending Address: 0x0001FFFFFFF Range Size: 256 MB Physical Device Handle: 0x1101 Memory Array Mapped Address Handle: 0x1301 Partition Row Position: 1 from Crucial.com Q: How much memory can my computer handle? from Crucial.com A: 2048MB.

2 3

Any known problems with kernel-2.6.18-164.el5.x86_64 / x86_64 / 3ware?
by mbneto 01 Oct '09

01 Oct '09

Hi, I have a server that is running centos 5.3 x86_64 that until last week was running fine. With no error messages in console and in /var/log/messages the server simply stops responding. After a reboot everything is fine. The only change (that I could find) but that was not active before the first incident/reboot was the update of the kernel and friends. The server (is this can help) is a intel quad core, 8GB RAM , 3 x 1TB disks (raid mirror with 2 active / 1 spare via 3ware controller) Any known problem with the kernel-2.6.18-164.el5.x86_64? (I am assuming that this would be the only thing that could cause the problem due to the lack of other messages. Regards. yum.log Sep 24 12:13:48 Updated: openssl-0.9.8e-12.el5.x86_64 Sep 24 12:13:49 Updated: mysql-5.0.77-3.el5.x86_64 Sep 24 12:13:49 Updated: nspr-4.7.5-1.el5_4.x86_64 Sep 24 12:13:49 Updated: openssl-0.9.8e-12.el5.i686 Sep 24 12:13:49 Installed: libXrender-0.9.1-3.1.i386 Sep 24 12:13:49 Installed: freetype-2.2.1-21.el5_3.i386 Sep 24 12:13:51 Installed: fontconfig-2.4.1-7.el5.i386 Sep 24 12:13:52 Updated: mysql-5.0.77-3.el5.i386 Sep 24 12:13:52 Installed: libjpeg-6b-37.i386 Sep 24 12:13:52 Installed: 2:libpng-1.2.10-7.1.el5_3.2.i386 Sep 24 12:13:52 Updated: openssh-4.3p2-36.el5.x86_64 Sep 24 12:13:52 Updated: gnutls-1.4.1-3.el5_3.5.x86_64 Sep 24 12:13:52 Installed: keyutils-1.2-1.el5.x86_64 Sep 24 12:13:52 Installed: cairo-1.2.4-5.el5.i386 Sep 24 12:13:52 Installed: libtiff-3.8.2-7.el5_3.4.i386 Sep 24 12:13:53 Installed: atk-1.12.2-1.fc6.i386 Sep 24 12:13:53 Installed: libXfixes-4.0.1-2.1.i386 Sep 24 12:13:53 Updated: lftp-3.7.11-4.el5.x86_64 Sep 24 12:13:53 Installed: trousers-0.3.1-4.el5.x86_64 Sep 24 12:13:53 Updated: ecryptfs-utils-75-5.el5.x86_64 Sep 24 12:13:53 Installed: libXcursor-1.1.7-1.1.i386 Sep 24 12:13:53 Installed: libXft-2.1.10-1.1.i386 Sep 24 12:13:53 Installed: pango-1.14.9-5.el5.centos.i386 Sep 24 12:13:53 Installed: libXrandr-1.1.1-3.1.i386 Sep 24 12:13:54 Updated: nspr-4.7.5-1.el5_4.i386 Sep 24 12:13:54 Installed: libXinerama-1.0.1-2.1.i386 Sep 24 12:13:54 Installed: gnutls-1.4.1-3.el5_3.5.i386 Sep 24 12:13:54 Updated: openssh-clients-4.3p2-36.el5.x86_64 Sep 24 12:13:54 Updated: openssh-server-4.3p2-36.el5.x86_64 Sep 24 12:13:55 Updated: mysql-server-5.0.77-3.el5.x86_64 Sep 24 12:13:56 Updated: 1:nfs-utils-1.0.9-42.el5.x86_64 Sep 24 12:13:56 Updated: dnsmasq-2.45-1.1.el5_3.x86_64 Sep 24 12:13:57 Updated: openssl-devel-0.9.8e-12.el5.x86_64 Sep 24 12:13:57 Updated: mysql-devel-5.0.77-3.el5.x86_64 Sep 24 12:13:57 Updated: mysql-devel-5.0.77-3.el5.i386 Sep 24 12:14:04 Installed: kernel-2.6.18-164.el5.x86_64 Sep 24 12:14:04 Updated: kernel-headers-2.6.18-164.el5.x86_64 Sep 24 12:14:04 Installed: 1:cups-libs-1.3.7-8.el5_3.6.i386 Sep 24 12:14:05 Installed: gtk2-2.10.4-20.el5.i386 Sep 24 12:14:05 Installed: trousers-0.3.1-4.el5.i386 Sep 24 12:14:05 Updated: ecryptfs-utils-75-5.el5.i386

3 4

SATA cards?
by ML 01 Oct '09

01 Oct '09

Hi All, I have a server that is IDE drives and I dont have any so I wanted to put in a sata PCI card. Will CentOS be able to see the drives as they will be connected to the card? -ML

5 4

Re: [CentOS] CentOS for non-tech user
by Marcelo M. Garcia 30 Sep '09

30 Sep '09

Sorin Srbu wrote: >>> HTH. >> Hi Sorin >> >> You can "sudo bash" and you will have a root terminal. In it, you can >> set the root password for root. > > Yupp, as I said, at the time I was testing Ubuntu, I was rather green and > didn't know about those little tricks. Now is a another matter, but I still > prefer CentOS. Besides, opening a terminal and typing in "su -" is way > faster. Saves keystrokes. Hi The reason for Ubuntu in the laptop is simply because CentOS didn't work very well. I followed the wiki about XPS M1530[1] and everything almost work. At the office one of the developers uses a Dell Precision laptop with RHEL 5.3 (it came from Dell with RHEL) and works really fine. So, I image that some laptops are more CentOS/RHEL-friendly than others. Now I'm used to use sudo. It is a great tool. I use it everywhere. And everything I do appears in the logwatch. Regards mg. [1] http://wiki.centos.org/HowTos/Laptops/Dell/XPS_M1530

3 2

ftp issue in Centos 5.3
by Dave Stevens 30 Sep '09

30 Sep '09

I manage a small server that I back up weekly. I do this by making a tarball of relevant files then transferring it over the local subnet to my station (Fedora 11), whereupon I burn it to DVD. There is no optical burner on the server. The tarball amounts to a bit under 5 gigs. Recently I've started getting an error telling me to try PASV or PORT first. I use the gFTP client on my machine and as far as I know there is no option in this program to use either option either locally or remotely (on the server.) Any ideas on this one? Dave -- When addiction becomes commonplace in a society, people become addicted not only to alcohol and drugs, but to a thousand other destructive pursuits: money, power, dysfunctional relationships, or video games. A social perspective on addiction does not deny individual differences in vulnerability to addiction, but it removes them from the foreground of attention, because social determinants are more powerful.

3 3

Re: [CentOS] Asterisk and VOIP was Re: CentOS for non-tech user
by rb4centos＠gmail.com 30 Sep '09

30 Sep '09

-----Original Message----- From: Brian Mathis The difference is that CentOS is a general-purpose OS that can be used for many things, and has a much bigger installed base. That makes it more of a target and would likely be included in scanning tools. A custom OS running on a PBX might also have vulnerabilities, but it's also probably not a big target because of the diversity of systems out there and relative limited utility one would have if such a system were compromised. That you tend to tend to think of it as an "appliance" running the phone system does not change the fact that it's actually a full-blown server OS with the same issues as other servers. _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos

1 0

How to autoconfigure network?
by happymaster23 30 Sep '09

30 Sep '09

Hello, I have installed new network card under CentOS 5.3, but there are some problems. I want delete existing ifcfg-eth0 and automatically make new on as it is during OS installation process. Is it possible? Thank you

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Discuss September 2009