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Old 07-08-2008, 08:33 AM   #1
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Registered: Jul 2008
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Problem mounting RAID5 set (LVM paritions)

I have a friend that I'm trying to help out from off-site. He had a CentOS 4 server with a RAID5 set being served through an Adaptec 2110S card. He started having problems with his box and for some reason decided to re-install from scratch to CentOS 5.

I'm able to fdisk the RAID5 partition located at /dev/i2o/hda1, so I know that the new install is at least seeing the raid set. However, I'm not able to mount the disk. It should be noted that the RAID array was composed of 4 disks in a RAID5 configuration, with only one (I think, fdisk only showing one partition) partition. It was set up using LVM, which could be at the root of the problem.

Here is the output of the mount command:
root@box[~]: mount /dev/i2o/hda1 /temp
mount: you must specify the filesystem type

I need to be able to temporarily mount this partition to be able to pull off some data, but I don't see an option specific to LVM.

I think this may have something to do with the fact that it was set up using LVM rather than just regular ext3. If there is any other information that I can provide, please don't hesitate to let me know...this is my first time posting.

Thanks in advance!!
Old 07-09-2008, 01:31 PM   #2
Registered: Sep 2007
Location: SF Bay Area, CA
Distribution: CentOS, SLES 10+, RHEL 3+, Debian Sarge
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Heya, welcome to LQ.

If its set up using LVM, you really shouldn't try and mount the physical partition directly. Hopefully you haven't done anything through fdisk to mangle the RAID device.

What you need to do is to restore the metadata. Since your friend erased everything, check out this article:

Skip the raid section and go to the section "Recovering and Renaming the LVM2 Volume" and start from there.

Hope this helps.
Old 07-10-2008, 09:17 AM   #3
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Registered: Jul 2008
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Thanks for the advice. Literally minutes after posting this I found the article that you referenced, and had already followed the instructions there to get the volumes activated and mounted.

Thanks for your help, it is appreciated


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