[CentOS] Recover RAID

Christopher Chan christopher.chan at bradbury.edu.hk
Thu Mar 4 05:34:53 UTC 2010

On Thursday, March 04, 2010 01:15 PM, Jeff Sadino wrote:
> Backups?  I wish :)  I will now.

/me hands Jeff a big clueby4 to use on the former admin.

> But looking closer, that md1 is not my OS partition, just a data
> partition.  If I take that md1 entry out of the raidtab file and restart
> the computer, I would think that it would start up just fine, minus the
> data partition (and for the moment neglecting any vital programs that
> might be installed on that partition).  My question is when I start the
> computer back up, in order to start up without that partition there any
> more, will the OS write any new files or anything that will not be
> reversible?

Yes...logs mainly. Most probably not reversible that lot. You may need 
to comment out the entry in /etc/fstab for md1 too. You might see 
messages from services tied to the data partition and if they get in the 
way of start up, just go into single-user mode and disable them...

> Thank you again,
> Jeff
> On Wed, Mar 3, 2010 at 6:40 PM, Ross Walker <rswwalker at gmail.com
> <mailto:rswwalker at gmail.com>> wrote:
>     On Mar 3, 2010, at 10:24 PM, Jeff Sadino <jsadino.queens at gmail.com
>     <mailto:jsadino.queens at gmail.com>>
>     wrote:
>      > Ok, I'm learning a lot about raids and what to do, and what not to
>      > do.  Looking at some info I had before, md1 was 200GB in size, which
>      > makes sense, but it was only 39GB full.  The way I repartitioned
>      > drive 1, I probably overwrote only about 11GB.  Does that make it
>      > any easier to recover any amount of the raid?  Is there some sort of
>      > "recover lost partitions" option in Linux or gparted?
>     Don't you have backups of this data?
>     You can just re-create the raid0 and restore the data.
>     -Ross
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