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Re: [CentOS] Download the repo DAG of CentOS 5.5
by aly.khimji＠gmail.com 03 Apr '11

03 Apr '11

I believe there is a rpm available from the DAG site, that will install the .repo file and setup everything you need to access the repo Ak ------Original Message------ From: Fidel Dominguez-Valero Sender: centos-bounces(a)centos.org To: centos(a)centos.org ReplyTo: CentOS mailing list Subject: [CentOS] Download the repo DAG of CentOS 5.5 Sent: Apr 3, 2011 2:12 PM hello somebody might help to create a script to download the repo DAG of CentOS 5.5 to my PC. I already did with OS, Update, and Extras packages. I want to do with DAG repository. I tried but I don't know much about scripts. Thanks Fidel _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos Sent from my BlackBerry device on the Rogers Wireless Network

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KVM Host Disk Performance
by Chuck Munro 03 Apr '11

03 Apr '11

Hello all, I'm having quite an interesting time getting up to speed with KVM/QEMU and the various ways of creating virtual Guest VMs. But disk I/O performance remains a bit of a question mark for me. I'm looking for suggestions and opinions .... This new machine has tons of disk space, lots of CPU cores and loads of RAM, so those are not issues. I currently have several software RAID-6 md's, each of which is about 700 GBytes. The md's are created as partitionable arrays, and I assign the resulting "raw" disk devices to each CentOS Guest OS, which then partitions the space according to its needs. Unlike using the more common "filesystem-in-a-file" method, the use of partitionable MD devices usually results in wasted disk space, but my aim is to provide the best performance possible with robust RAID. Is there a better-performing way of assigning disk space to Guest VMs? What about 'qcow2'? I understand its copy-on-write offers several advantages, but does it perform better than using partitionable md arrays or does the underlying filesystem overhead get in the way? Perhaps the native overhead of RAID-6 dual parity makes the whole question moot. Would the use of RAID-10 with hot spares be paranoid enough? I'm using 2 TByte drives which inherently have much greater chances of data errors, so I must keep data reliability in mind. I don't want to start a religious war over RAID and Guest VM disk methodology, but I have the luxury of trying various disk configurations until I get a reasonable balance between performance and reliability with these large drives. So many questions ... so much to learn. Lots of Googling around is quite useful but can lead to information overload :-) Cheers, Chuck

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WD RE4-GP Dropped From Raid
by Gerhard Schneider 02 Apr '11

02 Apr '11

Did you check if you already have the G05 firmware on all RE4-GP? The G04 firmware is not suitable for RAID. http://forum.qnap.com/viewtopic.php?f=182&t=25057 GS -- Gerhard Schneider Institute of Lightweight Design and e-Mail: gs(a)ilsb.tuwien.ac.at Structural Biomechanics (E317) Tel.: +43 664 60 588 3171 Vienna University of Technology / Austria Fax: +43 1 58801 31799 A-1040 Wien, Gusshausstrasse 27-29 http://www.ilsb.tuwien.ac.at/~gs/

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repeated local ephemeral to 80
by Michael D. Berger 02 Apr '11

02 Apr '11

On my CentOS box that I use mainly as a web server, I have iptables set to log and reject anything that I don't expect. So lately, I have getting things like this: Mar 29 17:27:20 mbrc20 kernel: IPT-DROP IN= OUT=lo SRC=192.168.9.20 DST=192.168.9.20 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=46910 DF PROTO=TCP SPT=56624 DPT=80 WINDOW=32792 RES=0x00 SYN URGP=0 OPT (0204400C0402080A4A26F7A50000000001030307) UID=0 that on at least one occasion repeated for every few seconds for more than three hours. The ephemeral source port keeps changing in an irregular manner. Any suggestions? Thanks, Mike

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Cent OS clustering and Support.
by Kumar, Ranjan 02 Apr '11

02 Apr '11

Hi, We are a Channel product team within LSI and we are trying to add Cent OS 5.5 to our compatibility Matrix. We found out that LSI currently has a relationship with CentOS for another project on the Internal Storage division but not with the OS Certification team. We require some information on CentOS which will help us plan the deliverables. And considering the timelines we need to deliver at it will be great if someone from CentOS can help us out in this regard. If anybody else also can answer these in the mailing list, we would be grateful. The questions that we have are as follows:- 1) Cluster Support : * Does CentOS 5.5 provides native cluster support ? * Is there any cluster suite available for CentOS 5.5 ? * Can we use the cluster suite in CentOS 4 for 5.5. 2) Does CentOS have any self Certification tool which allows OEMs/Vendors to qualify the OS and post it in their compatibility matrix? One we start our qualification, we might need some help in resolving issues/defects on CentOS. Can we open a channel or Point of contact who will be able to help us out with such issues. I would also request to forward this email to the right forum if the mailing list we are sending to is not the appropriate one. Thanks and Regards. Kumar Ranjan LSI Technologies.

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WD RE4-GP Dropped From Raid
by Steve Brooks 01 Apr '11

01 Apr '11

Hi All, I have a WD RE4-GP which dropped an Adaptec 51645 RAID controller. I ran a smartctl short test on the drive and it failed with a read error. So I ran the Western Digital's own diagnostic software (DLGDIAG), both the short and extended test on the drive and it passed with no errors. So I ran the smartctl short test again and again it failed. I then ran smartctl long test and that also failed at the same logical block address as the short test. Can anyone shed any light on this? Can I RMA the drive even if it passes Western Digital's own tests? Thanks in advance for any advice. Cheers, Steve

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logical volume - device present without table
by neubyr 01 Apr '11

01 Apr '11

I am trying to mount a logical volume for creating new initrd image. The lvs command is showing a logical volume with 'd' attribute - device present without tables. It's getting listed under /dev/mapper but not under /dev/VolGroup00. Any help on what might be wrong here? -- thanks, neuby.r

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Samba 3.3.8 and libsmbclient 3.0.33
by Timothy Kesten 01 Apr '11

01 Apr '11

Hi Folks, I know, that there is Samba Vers. 3..38 for WIN7-Clients. But what's about libsmbclient? There's only Vers. 3.033. Can I use / Have I to use this libraries for samba 3.3.8 Thx Timothy

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script question
by Jerry Geis 31 Mar '11

31 Mar '11

I can do "simply" search and replace with sed. However, I want to setup httpd.conf from a script that changes the default "/" which is presently: <Directory /> Options FollowSymLinks AllowOverride None </Directory> and change it to the following: <Directory /> Order Deny,Allow Deny from all AllowOverride None </Directory> How do you do that with scripts? Basically substitute everything between the two Directory tags. Thanks, Jerry

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Re: [CentOS] CentOS Digest, Vol 74, Issue 31
by Cal Sawyer 31 Mar '11

31 Mar '11

thanks for the reply, Phil It would, were udev not inserting USB and/or eSATA drives at /dev/sdb1 and/or /dev/sdc1 and exposing the array to the udev rule intended to handle only removable devices (at sdc or sdd). The array then mounts unpredictably in /media/xxx-sdc1 or sdd1 - not what is wanted - depend on how many removable devices are plugged at the time of rebooting. Of course, a single removable device will camp at sdb, which is out of reach of udev so the whole hotplug thing is broken until someone removes all of the devices at site, allowing a clean boot. mapper correctly places the / filesystem higher in position in rc.sysinit, followed by start_udev (where the damage gets done) and finally fstab evaluation way down the line. I suppose i could just hardwire the array mount into rc.sysint to engage after modules get loaded and hopefully before start_udev, unless there is a better way to enforce it. I'm not sure at this stage (need to analyse that ~1000-line script) if there is a suitable insertion point. It would be really good if it could be done outside of rc.sysint in some predictable place. We're "stuck" (but not unhappily) with this kernel/rev for the foreseeable future - i have over 100 of these systems and they are housed behind VPN'd networks, which mitigates somewhat their inevitable vulnerabilities. regards, - csawyer 30. Re: Controlling the order of /dev/sdX devices? (Phil Schaffner) CentOS 5.4(final) 2.6.18-164el5PAE. I am trying to prevent removable USB and eSATA devices from occupying /dev/sdX devices ahead of a 3ware RAID controller. For example: at boot, if a USB drive and eSATA HDD (connected to an LSI 1068E onboard controller, reflashed in "IT" mode to handle hotplug devices) were both present, they would occupy devices /dev/sdb and /dev/sdc, ahead of the RAID controller which ends up as /dev/sdd. As these are removable devices, they should normally get handled by custom udev script looking for adds matching KERNEL=="sd[c-z][0-9]" ,SUBSYSTEM=="block", so the volume handled by RAID controller gets grabbed by udev but fails to mount and subsequent udev plug events fails due the slots left empty below /dev/sdd. If no hotplug devices are present while booting, fstab handles mounting of the system and RAID volume: SATA system HDD /dev/VolGroup00/LogVol00 / RAID array LABEL=STORE /store ## mounts == /dev/sdb1 I realise this description is kind of a tangle, but i am essentially looking for a way to hard-map the 3ware RAID controller to /dev/sdb (UUID won't work as there are multiples of this system) before PCI (?) enumeration picks up the USB and LSI-managed devices so that udev can take care of the device at /dev/sdc and above. I've tried blacklisting the mpt and usb-storage modules and short-circuiting SUBSYSTEM=="block" devices in 05-udev-early.rules, all with zero or negative effect. rc.sysinit doesn't appear to be the right place and that's about as deep down as i know how to go. cheers, cs ------------------------------ Message: 30 Date: Thu, 31 Mar 2011 10:24:42 -0400 From: Phil Schaffner <Philip.R.Schaffner(a)NASA.gov> Subject: Re: [CentOS] Controlling the order of /dev/sdX devices? To: <centos(a)centos.org> Message-ID: <4D948EAA.2070005(a)NASA.gov> Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Cal Sawyer wrote on 03/31/2011 08:13 AM: > Hi > > CentOS 5.4(final) 2.6.18-164el5PAE. I hope you are aware that you are using a very obsolete OS with a lot of known (i.e. exploitable) security holes and bugs that have subsequently been fixed. ... > I realise this description is kind of a tangle Indeed. Why does a line in /etc/fstab like LABEL=STORE /store ext3 defaults 1 2 not work?

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