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RHEL/Centos6 handling disks w/4k sectors?
by Les Mikesell 07 Feb '11

07 Feb '11

Does anyone know if 4k sectors will be handled better by the kernel in Centos6? I'd like to copy backups to a 750Gb laptop type drive for offsite storage but the best write speed I can get is about 8MB/sec even with dd to the raw disk which shouldn't have an issue with partition alignment. -- Les Mikesell lesmikesell(a)gmail.com

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selenium rc server - run it on a specific display help!
by Roland RoLaNd 07 Feb '11

07 Feb '11

Dear all, i'm trying to run multiple selenium rc server on a centos box (different ports) with developers connecting to it through VNC (different respective ports) to check their automated test result. i can easily do the above manually (when it comes to running RC server). though automating the process is proving to be difficult. can anyone guide me on how to run a service on a specific display in an automated process? right now if i connect to a vnc session (any port) and i run it manually through iterm, it works normally. though setting an cron job that does the above, isnt working (rc opens in shell instead of on each dev's assigned display)

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OpenSSH could be faster...then why don't they path it??
by kellyremo 07 Feb '11

07 Feb '11

https://www.psc.edu/networking/projects/hpn-ssh/hpn-v-ssh-tput.jpg "SCP and the underlying SSH2 protocol implementation in OpenSSH is network performance limited by statically defined internal flow control buffers. These buffers often end up acting as a bottleneck for network throughput of SCP, especially on long and high bandwith network links. Modifying the ssh code to allow the buffers to be defined at run time eliminates this bottleneck. We have created a patch that will remove the bottlenecks in OpenSSH and is fully interoperable with other servers and clients. In addition HPN clients will be able to download faster from non HPN servers, and HPN servers will be able to receive uploads faster from non HPN clients. However, the host receiving the data must have a properly tuned TCP/IP stack." My question is: So Why Does the original OpenSSH has "limited statically defined internal flow control buffers"?? It could be way faster, even 10x!! With the HPN-SCP path it could be the descendant of FTP! Why aren't there any ""OpenSCP packages""? ('normal SCP+HPN-SCP path+no local user needed for SCP'ing+chroot by default') Any opinions? Thank you!

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if the file changes send email about diff
by kellyremo 06 Feb '11

06 Feb '11

I have 2 script. Script "A", Script "B". Script "A" is regulary watching the "dhcpacks" [dhcp release is configured to 2mins] in the logs, for the past 2 minutes. it writes the MAC addresses to a file [/dev/shm/dhcpacks-in-last-2min.txt] every 2 minutes. Ok, this is working, active clients are in this file. Super! Script "B": http://pastebin.com/raw.php?i=wvhwhPWu I'm trying to create a script, that watches the changes in "/dev/shm/dhcpacks-in-last-2min.txt" file [in every 1 sec]. Ok. But: my "watcher" script [the pastebined] is not working fine...sometime it works, sometime it send that someone "XY logged out", but it's not true! nothing happened, and the problem is not in the Script "A". Can someone help me point out, what am i missing? How can i watch a file [in every sec], that contains only MAC addresses, and if someone doesn't get dhcpack in 2 minutes, the file "/dev/shm/dhcpacks-in-last-2min.txt" changes, and that clients MAC address will be gone from it, and i need to know, who was it [pastebined my script..but somethings wrong with it]. Thank you for any help..i've been pathing my script for days now.. :\

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future version of bind for el5
by fakessh ＠ 06 Feb '11

06 Feb '11

hello all the people I'd call http://people.redhat.com/ atkac ~ / official member of the team redhat for news of future versions of bind 9.7 for el5 sincerely -- gpg --keyserver pgp.mit.edu --recv-key 092164A7 http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x092164A7

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Fan speed control on Supermicro X8DAL board with CentOS
by Chuck Munro 06 Feb '11

06 Feb '11

Hello folks, I'm having a difficult time trying to figure out why the CPU cooling fans run at full speed on my Supermicro X8DAL-3 motherboard. There doesn't seem to be any variable speed (the fans are PWM compatible) ... they either idle at almost nothing, or suddenly burst into a high-pitched scream that gets my ears bleeding after a few seconds. Once they jump to warp-10, they remain there. The "Super-I/O" chip on this board is a Winbond W83627DHG which does the temperature and voltage monitoring. Is anyone aware of which driver or kernel module I need for that chip in order to get control of the fans? The Supermicro web site and the board's manual aren't any help. Fresh installs of CentOS-5.5 and RHEL-6 don't exert any control by default. Installing the lm_sensors package and probing with the 'sensors' command didn't help either. Slowly going deaf ....... Chuck

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Significant speedup of package building with mock from EPEL for RHEL 6, should definitely go in CentOS 5
by Nico Kadel-Garcia 05 Feb '11

05 Feb '11

The speedups in building RPM's with "mock" from the EPEL packages for RHEL 6 are *profound*, especially if your environment is like mine and you have thousands of user id's. The issue seems to be the handling of "/var/log/lastlog" and similar files, which are otherwise quite large and take significant time to compress and uncompress when laying out new mock environments. Karabhir, what are the odds of encouragng a switch to http://mirrors.kernel.org/fedora-epel/6/mock-1.1.8-1.el6.src.rpm, and backporting it to centos/5/5/extras ? It's working very well for me, and I think it would be a helpful improvement in RPM building for both the CentOs 5.6 and CentOS 6 efforts.

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x25 line xterm
by Hal Davison 05 Feb '11

05 Feb '11

Noted that xterm by default uses 24 lines per window. I have reviewed /etc/termcap looking for a specific entry for xterm that I can edit to change the ln#24 to ln#25 for our application. When I used RedHat there was an editable option to change the number of displayable lines as is done in putty. Any suggestions? --Hal. -- Hal Davison Observe Goal, Set the course, Burn the map Davison Consulting This correspondence was composed using Dragon Speaking Version 10 Peg#: 2007011701

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CentOS 6.0 alpha testers
by valent.turkovic＠gmail.com 05 Feb '11

05 Feb '11

Hi guys, who do I need to contact to become CentOS tester? When is first alpha due for release and testing? Cheers, Valent. -- follow me - www.twitter.com/valentt & http://kernelreloaded.blog385.com linux, anime, spirituality, wireless, scuba, linuxmce smart home, zwave ICQ: 2125241, Skype: valent.turkovic, MSN: valent.turkovic(a)hotmail.com

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LiveCD System recovery - Mounting LVM?
by Johan Martinez 05 Feb '11

05 Feb '11

Hi, I am trying to recover data from my old system which had LVM. The disk had two partitions - /dev/sda1 (boot, Linux) and /dev/sda2 (Linux LVM). I had taken a backup of both partitions using dd. Now I am booting of CentOS live cd for system restore. I recreated partitions like previous system using fdisk and then used dd to dump all the data onto it. I would like to mount sda2 as LVM, but I don't know how to do that. Any steps or howto mount LVM manually would be really helpful. I think I can recover the system once I am able to access sda1 and sda2. Any help? jM.

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