Discuss January 2011

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276 participants
289 discussions

Storage Area Network
by Nastou Panagiotis 22 Jan '11

22 Jan '11

Hello, I have a Rocks cluster based on Centos 5.2. Can this Centos version support a Storage Area Network? What kind of software do I need for installing and managing it? Regards, Panos Nastou Dpt of Mathematics Aegean University Samos Island Greece

2 1

Xen; xm usb-add syntax - or - where is xm usb-attach
by aurfalien＠gmail.com 22 Jan '11

22 Jan '11

Hi all, I'm running Centos 5.5 with Xen 4.0.1 Would like to use a USB key (not a block device) in my domU. Dom0 lsusb yields; Bus 002 Device 004: ID 064f:0bd8 ABC-Systems AB CDE/FG xm usb-add shows; Usage: xm usb-add <domain> <[host:bus.addr] [host:vendor_id:product_id]> Not sure what combo will work in this case. However, I've read some notes regarding xm usb-attach. What subset of Xen do I need for this command to show? - aurf

2 4

CentOS and Dell MD3200i / MD3220i iSCSI w/ multipath
by Edward Morbius 22 Jan '11

22 Jan '11

We've been wrestling with this for ... rather longer than I'd care to admit. Host / initiator systems are a number of real and virtualized CentOS 5.5 boxes. Storage arrays / targets are Dell MD3220i storage arrays. CentOS is not a Dell-supported configuration, and we've had little helpful advice from Dell. There's been some amount of FUD in that Dell don't seem to know what Dell's own software installation (the md3 Dell doesn't seem to have much OS experience generally. Their docs are pretty inconsistent. I've noted omissions, terminology differences, and procedural differences among the "Owner's Manual", "Deployment Guide", a professional services "Remote Services Installation Agreement" service description. Some of the multipathing guidance we've had comes from their EqualLogic line of storage servers. Questions: 1: Is there anyone out there running this configuration and are you satisfied with it? 2: We get a set of error messages on the initator at target login. These appear to be benign, and web research suggests it's the result of a driver configuration issue in trying to send instructions to a http://comments.gmane.org/gmane.linux.iscsi.open-iscsi/5970 http://bit.ly/gguLl7 MD3000i boxes have 1 controller that can execute IO and one that cannot execute READ/WRITE IO until a special command is sent. In older kernels, layers like the partition scanning and udev and hal would send down IO to those disabled paths and we would see IO errors like in your link. In newer kernels we have device handler modules (for MD3000i you would want scsi_dh_rdac (so do "modprobe scsi_dh_rdac" and then lsmod to see if it is there)) that will detect if the path is not active and if so it will either not send the IO or it will not print a error message since we expect the IO to fail. We'd prefer *not* seeing spurious I/O errors that we don't have to sift through looking for real storage issues. 3: The MD32xxi series is a dual-controller array with multiple ports on each controller. Multiple targets can be logged into from an initiator, with the pathways aggregated by the Linux multipath (device-mapper-multipath) system. There's very little clear documentation on multipath. In particular, any way to trigger alerting from multipath events / failures, or iscsi session actions, would be helpful. The MD32xxi series only supports reporting from a GUI management utility (MDSM) which would be at best problematic to run in a server environment. The other question is: is multipathing typical of iSCSI configuation? Little of the iSCSI docs I've found discusses multipath configurations at all: http://www.open-iscsi.org/ http://www.cuddletech.com/articles/iscsi/index.html (good but very dated) http://www.cyberciti.biz/tips/rhel-centos-fedora-linux-iscsi-howto.html (no mention of multipathing) 4: Dell suggests a shutdown procedure including a flush of multipathing paths ("multipath -F" -- in the "Owner's Manual"): 3 Flush the Device Mapper multipath maps list to remove any old or modified mappings # multipath F Presumably this would go into one of the init scripts -- perhaps the /etc/init.d/multipath script, as part of the "stop" sequence (after the multipath daemon is killed). Anyone done this or know why the practice is recommended? Based on our experience with Dell I would NOT recommend this configuration for others. But we're stuck with it, and any help in getting things configured would be very helpful and gratefully received. I'm also hoping to get clearance to release docs we've generated, though that's the subject of some internal negotiation. -- Dr. Ed Morbius Chief Scientist Krell Power Systems Unlimited

3 5

vmware
by mattias 22 Jan '11

22 Jan '11

Can i run xen and vmware on the same machine?

6 10

smartmontools SRPM fails
by Mike McCarty 22 Jan '11

22 Jan '11

I want to install smarmontools v 5.40, and so I pulled the SRPM for 5.39 so I could patch and install... $ wget -Nc ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/s… However, the install of the source fails. $ rpm -ivh smartmontools-5.39.1-2.el6.src.rpm warning: smartmontools-5.39.1-2.el6.src.rpm: V3 RSA/MD5 signature: NOKEY, key ID fd431d51 1:smartmontools warning: user mockbuild does not exist - using root warning: group mockbuild does not exist - using root ########################################### [100%] error: unpacking of archive failed on file /home/jmccarty/devtools/RebuildRPM/build/SOURCES/smartd.initd;4d39deaa: cpio: MD5 sum mismatch Is the SRPM corrupted? I've pulled a few from other places for other versions (like Fedora) from pbone, and they all have this problem. Any hints available? Mike -- p="p=%c%s%c;main(){printf(p,34,p,34);}";main(){printf(p,34,p,34);} Oppose globalization and One World Governments like the UN. This message made from 100% recycled bits. You have found the bank of Larn. I speak only for myself, and I am unanimous in that!

4 7

vmware
by mattias 21 Jan '11

21 Jan '11

I solved it I installed the openvz kernel without openvz utilites And now vmware works

1 0

Let's talk about HTTPS Everywhere
by S Mathias 21 Jan '11

21 Jan '11

Ok. It's a Firefox Add-on: https://www.eff.org/https-everywhere Questions: 1) But: Why can't i find it on the offical Firefox Add-ons site?: https://addons.mozilla.org/en-US/firefox/ 2) Did anyone audited the "HTTPS Everywhere" code? 3) Can someone trust this Add-on? Is it safe to install/use? 4) If it's so great why isn't it more prevalent? What's youre opinion? Or answer? :\ Thanks!

11 18

how to set imagemagicks tmp folder?
by S Mathias 21 Jan '11

21 Jan '11

my /tmp is too small [when i want to use "convert"]. how can i set imagemagick, to use an other tmp folder, what has enough space? thank you!

6 8

Is there a difference between RHEL 6 and 5.6?
by Robert Moskowitz 21 Jan '11

21 Jan '11

I have seen over the past few months subjects on RHEL 6 and RHEL 5.6 Are these two different builds for Centos to chase or one in the same?

6 8

looking for a package
by m.roth＠5-cent.us 21 Jan '11

21 Jan '11

I'm trying to update a workstation, and it wants to update mpeg2-utils. But that has a dependency of libmpeg2-0.5.1-3, for i386. epel doesn't have it, and I tried looking on rpmfusion.org, and I can only find a very few packages there. Anyone have an idea which of the regular repositories carries libmpeg2? mark

5 4

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Discuss January 2011