md RAID and LVM recovery techniques.

[Robin Laing]

Dennis Castanos wrote:
> I.have good luck with 'ghost for linux' for single non raid drive.  I 
> was wondering if the slave drive (RAID) had to be restored along with 
> the primary, when wanting to restore to an erlier backup for whatever 
> reason.
> dennismouille at yahoo.com
> 
> */Robin Laing <Robin.Laing at drdc-rddc.gc.ca>/* wrote:
> 
>     Robin Laing wrote:
>      > Hello,
>      >
>      > I know how to recover a single md drive but I am not sure how
>     this works
>      > under LVM.
>      >
>      > My situation is two drives for md0 (~130gig) and two for md1.
>     This on
>      > FC4 so shouldn't make that much difference.
>      >
>      > Joined together under LVM. One of the md0 drives failed on the
>     weekend
>      > and I want to ensure that I do this correctly.
>      >
>      > As the drive comes up with no file-system error, I want to pull the
>      > drive out and test it in an external carrier and possibly map out
>     bad
>      > blocks.
>      >
>      > The other option is to replace the drive with a much larger drive
>     (price
>      > is lower) and partition the as a replacement.
>      >
>      > Can I just rebuild the drive under md tools and it will work in
>     the LVM
>      > or do I have to re-label the drive?
>      >
>      > If I pull the drive and put it in a carrier, will I be able to
>     pull data
>      > off of the drive?
>      >
>      > Basically, can I just ignore the LVM on this drive?
>      >
>      >
> 
>     Well no help from the list as of yet but I did finally find this which
>     may be useful to others.
> 
>     http://www.linuxjournal.com/article/8874
> 
> 
>     -- 
>     Robin Laing
> 
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> 
My LVM is across multiple drives.  One set of drives are working great. 
  The second set is out of business at this time.

I am making a current full backup before I start working on the drives. 
  There are no issues with the working drives "yet".

I will do a full test of the HDDs, before putting them back in service. 
  The may just need to be synced as there was a power issue, not a full 
crash.

-- 
Robin Laing