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Diskdevstat
by Jussi Hirvi 07 Jul '11

07 Jul '11

> Red Hat Enterprise Linux 6 also introduces diskdevstat for monitoring > disk operations and netdevstat for monitoring network operations. How could I monitor disk operations under CentOS 5? The quote is from RHEL 6 release notes http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.0_Relea… - Jussi

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Power-outage
by Timothy Murphy 07 Jul '11

07 Jul '11

I have a CentOS-5.6 remote server in a house in Italy, where there are occasional thunder-storms. There was one yesterday, when the electricity went off 3 times, for a second or so on each occasion. My server, an HP MicroServer, came back (re-booted) on 2 of the 3 occasions, but not on the third. I assume that the problem arises because the machine does not close down properly. (Although it is also possible that a voltage surge might have been responsible - I have no surge protector on this supply.) It seems to me that it should be possible to have a simple, torch-battery operated, system which will keep the machine alive long enough to make a graceful exit. A full-blown UPS would be excessive, I think, as I only want the machine to re-boot when the current comes back on. I know there is a Remote Management (iLO) card for this machine, which might be useful for this. Unfortunately, I've already used the PCIe slot for a second ethernet card. Any advice or suggestions gratefully received. -- Timothy Murphy e-mail: gayleard /at/ eircom.net tel: +353-86-2336090, +353-1-2842366 s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

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Re: [CentOS] Cluster Failover Troubleshooting (luci and ricci)
by Ryan Bunce 07 Jul '11

07 Jul '11

Ljubomir Ljubojevic wrote: You should provide your complete network setup (IP's routes, DNS) records for both systems, maybe someone else can find the error. Ljubomir Original posting on mailing list: http://lists.centos.org/pipermail/centos/2011-July/113454.html Here is my network configuration: |------ 10.6.2.x -------- Web1 ------- 172.2.2.x ---| Firewall ----- Switch -----------virt shared IP 10.6.2.42 | |------ 10.6.2.x -------- Web2 ------- 172.2.2.x ---| I'm currently using internal DNS for testing so no public DNS has been registered. I use the host file for the backend (172.x.x.x) network resolution. Routing is pretty simple, I don't think there's a problem with that. I think the piece that I need the most is some info on how to up the logging to provide additional debug information. If someone knows how to turn that up I'm sure I could come up with some more information to troubleshoot on my own. Thanks again. Ryan

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HP Smart Array B110i SATA RAID Controller Driver
by Kaushal Shriyan 07 Jul '11

07 Jul '11

Hi I am trying to install CentOS 5.6 on HP DL 180 G6 which has HP Smart Array B110i SATA RAID Controller Driver. I have 4 * 500 GB SATA HDD and configured RAID 1+0 using System BIOS, the BIOS detects usable disk space as 940GB disk space, when i start installing the OS, it does not detect HP Smart Array B110i SATA RAID Controller Driver As per http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp?la… Is there a way to get .iso file during installation of CentOS Linux ? Please suggest/guide Regards Kaushal

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crontab
by Helmut Drodofsky 07 Jul '11

07 Jul '11

I would like to run a program at 2:35 at the first Saturday of each odd month. My solution: 35 2 1-7 1,3,5,7,9,11 6 /bin/program The program was executed yesterday = Wednesday = day 3, cron ignores the day of the week! Is there a solution with cron - or have I to write a script to check the date? Helmut

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CentOS on the HP MicroServer
by Timothy Murphy 07 Jul '11

07 Jul '11

I'm been running two HP MicroServers as home-servers under CentOS-5.6 for 2 months, and have been very happy with their performance. I'm wondering if there are many other MicroServer/CentOS users around? I've been surprised when looking at the MicroServer forums (eg <<http://www.avforums.com/forums/networking-nas/ 1431514-hp-proliant-microserver-n36l-owners-thread.html>) how few posts I see from CentOS users, even though RHEL is one of the only two OS's officially supported by HP for this machine (the other is Windows Home Server). Is there by chance a MicroServer/CentOS forum anywhere? I haven't been able to locate one. The MicroServer is incredibly cheap at the moment, as HP keep extending their cash-back offer which brings the price down to about €160 (with 1GB RAM and a 250GB SATA disk). There is a large amount of official HP Linux support, eg the "HP Smart Update Manager", though as usual with HP software I find it quite difficult to use. (I have the same feeling about HP support for printers.) -- Timothy Murphy e-mail: gayleard /at/ eircom.net tel: +353-86-2336090, +353-1-2842366 s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

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Strange autotools error
by John J. Boyer 07 Jul '11

07 Jul '11

I am using CentOS 5.6, autoconf 2.59 and automake 1.9.6. I run an autogen script which cleans all autotools files and then installs new ones. If the appliction has no dependencies running configure, make and make install works fine. However if it has dependencies I get the messages "Creating Makefile" and "Could not find input file Makefile". I've herd that I need another development package. What is it? Or what causes these contradictory messages? I must say that I have encountered this sort of problem only on CentOS. Thanks, John -- John J. Boyer; President, Chief Software Developer Abilitiessoft, Inc. http://www.abilitiessoft.com Madison, Wisconsin USA Developing software for people with disabilities ----- End forwarded message ----- -- John J. Boyer; President, Chief Software Developer Abilitiessoft, Inc. http://www.abilitiessoft.com Madison, Wisconsin USA Developing software for people with disabilities

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How much SWAP Space.
by Kaushal Shriyan 07 Jul '11

07 Jul '11

Hi, I have loaded CentOS 5.6 on HP DL 180G6 2U Rack Server and the physical RAM is 32 GB. As per http://www.centos.org/docs/5/html/Deployment_Guide-en-US/ch-swapspace.html It says it should be 1 x of Physical RAM or less. Not sure about the "less" word in deciding swap space size Please suggest/guide further on what all parameters i should decide to set swap space. Regards, Kaushal

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What are the advantages of upgrading from 5.6 to 6?
by John J. Boyer 06 Jul '11

06 Jul '11

I've just installed CentOS 5.6. What would I get if I upgraded to 6? Would I have to reinstall all applications or could I just restore my /etc and /usr directories and do an update? Thanks, John -- John J. Boyer; President, Chief Software Developer Abilitiessoft, Inc. http://www.abilitiessoft.com Madison, Wisconsin USA Developing software for people with disabilities

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pam update
by Paul A 06 Jul '11

06 Jul '11

Hi, I'm currently using, CentOS release 4.8 (Final) and wanted to update the pam_tally module to support unlock_time. I understand this is only support on centos 5.x and up. What are my options for updating pam_tally to support unlock_time, can I simply download and update from a centos repo or should I compile pam. I would appreciate some suggestions. paul

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