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Old 08-03-2009, 01:53 PM   #1
Registered: Mar 2005
Location: NYC
Distribution: CentOS 5
Posts: 54

Rep: Reputation: 16
Stupid RAID error(s). How should I fix this?

I have a (backup) server offsite that I replicate our office data server to. Unfortunately, I created a RAID0 partition for / on my two PATA drives (my /boot partition is RAID1).

To fix this, I think I should:
attach a PATA drive that I can add live (through a USB connection), copy the / partition to a partition on the PATA/USB drive. Reformat the RAID0 partition as RAID1, then copy back the partition.

Will that work? I can do this without rebooting, I believe. Correct? I think I should probably reboot to make sure the machine will come up if there's a problem in the future, anyway.

Does anyone have a better solution?


Old 08-03-2009, 02:00 PM   #2
Registered: Jul 2009
Location: Illinois, US
Distribution: Fedora 11
Posts: 374

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You shouldn't do the copy live (if anything changes during the copy, you could get an inconsistent filesystem), and you won't be able to unmount / live. You should boot a Live CD or USB environment - pick your favorite mainstream distro's install disk, perhaps - and work from there. I assume that by 'copy the / partition' you mean the files and not the partition itself; the latter won't work since switching from RAID 0 to RAID 1 will halve your disk space. That'll work fine, but two major things to remember: first, make sure you use an -a (--archive) option when making both the copy and copying back. cp and rsync both take -a, but cp has a habit of missing .files, so I recommend rsync. Second, you'll need to manually install grub to your new RAID 1 or it won't boot. Take some time to read up on that if you're not already comfortable doing it.
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Old 08-03-2009, 02:14 PM   #3
Registered: Mar 2005
Location: NYC
Distribution: CentOS 5
Posts: 54

Original Poster
Rep: Reputation: 16
Thanks for the heads up on the live copy. I *could* grow the partition on the RAID1 PATA, but that's a good point, too.

Since I take the / partition, but exclude the /tmp, /boot, /var, and /home directories (since they are on different partitions), could I:
1) dd if=/dev/md1 of=/dev/$USBDRIVE
2) reset the RAID to RAID1
4) reinstall grub on the / directory
5) reboot


Last edited by ABL; 08-03-2009 at 02:14 PM. Reason: added rsync in step 3


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