Re: Problem diagnosing rebuilding raid5 array

Thanks a lot Neil and also big thanks to Brian.

With your help I've have now successfully rebuilt the array. When I  
get the drives RMA'd and get new drives back I'll add those to the  
array and turn it into a raid 6.

Thanks again,
Peter


Quoting NeilBrown [off-list ref]:

On Wed, 16 Oct 2013 22:27:54 -0400 peter@steinhoff.se wrote:

quoted

I was just wondering but since I lost 4kB of data when I cloned sdd,
does that mean that I will have 4x4kB of garbled data somewhere since
I assembled 4 drives (n-1) and the raid system wouldn't know? Or would
that have been detected somehow when I ran fsck (ext3)?

You could have 2*4kB of garbled data (the block you lost, and the
corresponding block on the device that was rebuilt).
Or you could have 1*4kB, or 0*4kB garbled if either the corrupted block or
the recovered block were parity blocks.

Those bad blocks are not likely in filesystem metadata else fsck should have
noticed.  They could be in some file(s), or in some free space - in which
case you'll never notice.

NeilBrown