Rescuing mangled RAID5 array
- From: Greg Eden <greg@xxxxxxxxxxxxx>
- Date: Tue, 14 Nov 2006 18:30:26 +0000
Hello
I'm trying to recover data from a broken RAID5 array (drive removed whilst array was rebuilding!).
What's the best way to get an image of the corrupted partition and how would I run fsck -y on the image. The corrupted partition is 1.3TB, /dev/da1s1d, usually mounted as /raid. I have another empty 2TB partition handy, /dev/da2s1d currently mounted as /raid2.
Following this thread
http://lists.freebsd.org/pipermail/freebsd-questions/2006-November/ 134984.html
I'm trying
dd if=/dev/da1s1d of=/raid2/rescueimage
but it's proceeding very slowly (2MB/sec) and I'm not entirely sure I'm going to be able to mount and fix the resulting image with fsck at the end of it.
So is there a faster way to clone a partition (unfortunately the drive array itself doesn't offer this functionality) and can you fsck an md mounted image. assuming i should use md to mount the image?
There's nothing wrong with the drives physically, just mangled metadata I think. I can actually mount the partition readonly but many directories are missing or listed as 'Bad file descriptor'. I've copied about 20% of the data off but the most important 50% doesn't even have it's directory listed any more :(
Thanks in advance for any help
Greg.
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