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34758 discussions

Live CD Planning systems
by Robert Moskowitz 08 Jan '08

08 Jan '08

My company supplies me with a very nice HP nc2400. Much faster, more memory, etc than my old HP nc4010. Problem is the drive is not swappable, and they encrypt the drive (the OS is XP). The nc2400 has a DVD/CDRW and 2 USB 2.0 ports so I was thinking..... Make a Live DVD with everything I need but map /etc /root /home and /var/log (and what else?) to a USB flash drive (16Gb are available and I was just sent a PR on a 32Gb, maybe I can get an eval device :) ). So first I would want a bootable DVD that would have everything I want to have running on the cd2400. And of course, everytime one of the components get updated, I will have to build a new DVD. Then I would like to run within XEN my company's XP image on that encrypted drive. Is this possible. If I could do this, I can move the nc2400 as my 'workhorse', downgrade my nc4010 to my test box, and reallocate the Toshiba 3490 to the family.... And more importantly one less box to carry when traveling! I guess one thing in this whole equation will I be able to repartition the USB flash drive with a swap partition (will probably never use, as there is 1.5Gb memory in the nc2400. Twice as much as the nc4010), and an ext3 data partition? Or should I use LVM on it?

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Intel SRCS16 Controllers
by Joseph L. Casale 08 Jan '08

08 Jan '08

I have a centos box with a few of these in it. Its shipped monitoring/alerting software needs X, and this server only has a console installed. Does anyone have any experience with or a suggestion on how I could monitor these cards with something 3rd party based that doesn't need a gui, or Java at that matter! Thanks! jlc

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aacraid hard/firmware differences?
by Les Mikesell 08 Jan '08

08 Jan '08

This isn't really a Centos question but it affects the systems so I'll ask here anyway. I've noticed when swapping disks around on IBM 3550 boxes that some of them see one more cylinder on drives than others but I can't find any settings or differences that might control this. It's an obvious problem when you fdisk/format on the one that sees the additional cylinder, then move or copy this disk to one that doesn't. Does anyone know what controls this or if it is just a hardware or firmware version difference? -- Les Mikesell lesmikesell(a)gmail.com

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Strange Problem with dm-0
by James B. Byrne 08 Jan '08

08 Jan '08

I began an update of one of our servers via yum and, coincidentally or not, I have been getting the following logged into the message file since: messages:Jan 7 15:55:51 inet07 kernel: post_create: setxattr failed, rc=28 (dev=dm-0 ino=280175) Now, this tells me that dev dm-0 is out of space but, what is dm-0? So, can anyone tell me what is happening and why? -- *** 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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RE: [CentOS] I am confused. Chmod / chown issues?
by Jason Pyeron 07 Jan '08

07 Jan '08

> -----Original Message----- > From: replies-lists-a1z2-centos(a)listmail.innovate.net > [mailto:replies-lists-a1z2-centos@listmail.innovate.net] > Sent: Sunday, January 06, 2008 16:30 > To: Jason Pyeron > Subject: Re: [CentOS] I am confused. Chmod / chown issues? > > did you add yourself to the "busdev" group within your current > session? if so your session won't get the group access by default. > you log out/in to get it or (i think - though i never use it), use > "newgrp" (man newgrp for details). > > - Rick Yea, did that first. -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - - - Jason Pyeron PD Inc. http://www.pdinc.us - - Sr. Consultant 10 West 24th Street #100 - - +1 (443) 269-1555 x333 Baltimore, Maryland 21218 - - - -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- This message is for the designated recipient only and may contain privileged, proprietary, or otherwise private information. If you have received it in error, purge the message from your system and notify the sender immediately. Any other use of the email by you is prohibited.

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Switching screen resolution on the fly
by Jerry Geis 07 Jan '08

07 Jan '08

Is there any way other than CTL ALT + and CTL ALT - to set and or change the resolution of the X server when I want to. Is there a way to so take me to "1920x1080" mode and then later take me to "1366x768" mode. With xvidtune I see the -next and -prev options but I was hoping for jumping to specific modes. I so realize I can also edit out unwanted modes in the xorg.conf but I'd rather not manually change items on a machine. Thanks, Jerry

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ARGH!!! Instal fails at drive format time
by Robert Moskowitz 07 Jan '08

07 Jan '08

Got all the way through the selection of packages. All those time consuming tasks and the install got to formating the drive and crashed on a format error! Since I know exactly how I want to lay out the partitions, is there a way I can boot from CD, and get into Disk Druid to set the partitions and do the formating. Then when I come to the install just select to keep the drive how it is? And I have to have LVM....

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Migrating software raid from SUSE 9.0 to Centos 5
by Dan Carl 07 Jan '08

07 Jan '08

I have a SUSE 9.0 box with a software raid. It consists of 6 IDE drives and three different controllers The OS is on a separate drive. What I want to do is put a new boot drive in load Centos on it. Then I want to be able to mount the raid without loosing any of the data on it. What information do I need from the SUSE OS (raid info etc...) to tell Centos how to recognize it? The data is backup on DVD's but it would be a real pain to reload it.(its around a terabyte of data) So I'm writing here for some advice. I've setup many raids in the past but only fresh installs. Thanks

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DRBD NFS load issues
by Jed Reynolds 07 Jan '08

07 Jan '08

My NFS setup is a heartbeat setup on two servers running Active/Passive DRBD. The NFS servers themselves are 1x 2 core Opterons with 8G ram and 5TB space with 16 drives and a 3ware controller. They're connected to a HP procurve switch with bonded ethernet. The sync-rates between the two DRBD nodes seem to safely reach 200Mbps or better. The processors on the active NFS servers run with a load of 0.2, so it seems mighty healthy. Until I do a serious backup. I have a few load balanced web nodes and two database nodes as NFS clients. When I start backing up my database to a mounted NFS partition, a plain rsync drives the NFS box through the roof and forces a failover. I can do my backup using --bwlimit=1500, but then I'm not anywhere close to a fast backup, just 1.5MBps. My backups are probably 40G. (The database has fast disks and between database copies I see run at up to 60MBps - close to 500Mbps). I obviously do not have a networking issue. The processor loads up like this: bwlimit 1500 load 2.3 bwlimit 2500 load 3.5 bwlimit 4500 load 5.5+ The DRBD secondary seems to run at about 1/2 the load of the primary. What I'm wondering is--why is this thing *so* load sensitive? Is it DRBD? Is it NFS? I'm guessing that since I only have two cores in the NFS boxes that a prolonged transfer makes NFS dominates 1 core and DRBD dominate the next, and so I'm saturating my processor. Thots? Jed

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Remote desktop...
by Tolun ARDAHANLI 07 Jan '08

07 Jan '08

Hi; I need any suggestions of "remote desktop" program. Can you advise me about that... ? thanks to everybody... -- Tolun ARDAHANLI Bilgisayar Muhendisi E-posta:tolun.ardahanli@linux.org.tr Icq:326600 ---------------------------------------------------------------------------- Tolun ARDAHANLI Computer Engineer E-mail:tolun.ardahanli@linux.org.tr Icq:326600

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