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3081
December 2nd, 2011 19:00
buffer errors on md3000i connections
Ok, so I am only have a single LUN setup on my iscsi san (md3000i) and have two nics connected on the server connected to it. I have round robin multipath setup. Is there anyway for stopping these 20mb "disks" from showing up and causing these buffer errors from the kernel? Here are the errors and some conf info http://pastebin.com/raw.php?i=ueCwXmwa.
Doesnt appear that i can remove them from the hosts group. Says something about in band management requirements. Thoughts?
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MACscr
15 Posts
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December 2nd, 2011 19:00
Updated pastebin in case the above expires: pastebin.com/raw.php
Dev Mgr
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9.3K Posts
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December 3rd, 2011 10:00
You'll need to install MDSM on the host. MDSM is compatible with RHEL4, RHEL5, and some SLES distros. On CentOS it may or may not work (not supported by Dell, but sometimes it does work).
If you don't have any of the supported distros, I'd suggest to contact your OS support and ask them if there's a way to blacklist certain devices.
(you didn't mention your OS, but as you did mention kernel errors, I assume it's a linux/unix/bsd type OS)
MACscr
15 Posts
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December 4th, 2011 16:00
LOL, im not going to install MDSM on every single node connected to it. I only need it on the management node, which i do have.
MACscr
15 Posts
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December 4th, 2011 17:00
But yeah, the systems are RHEL 5.
Dev Mgr
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9.3K Posts
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December 4th, 2011 22:00
You don't need the management software on every node, but you do need the host software on each node. This gives you the multipathing software (native mpio isn't supported and has a high likelyhood of not properly working when it comes down to needing it (controller failure or so) as well as blocks the 20MB 'disks'.
MACscr
15 Posts
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December 4th, 2011 23:00
Well i am actually using the native dm-multipath and rdac. i only have a single controller.
Installed Packages
device-mapper-multipath.x86_64 0.4.7-46.el5_7.2
Kernel: 2.6.18-274.12.1.el5xen