Google first, ask later.  I found this in the manuals:

26.3.4 Fixing a Bad LAST_ID on an OST

The procedures there spell out pretty well what I must do, so this should be relatively straight forward.  But, does this comment refer to just this OST, or to all OST?
Note - The file system must be stopped on all servers before performing this procedure.

So, is this the best approach to follow, allowing for the fact that there is nothing at all left on the OST, or is there a better short cut to choosing an appropriate LAST_ID?

Thanks again,

On 5/19/2014 1:50 PM, Bob Ball wrote:
I need to completely remake a failed OST.  I have done this in the past, but this time, the disk failed in such a way that I cannot fully get recovery information from the OST before I destroy and recreate.  In particular, I am unable to recover the LAST_ID file, but successfully retrieved the last_rcvd and CONFIGS/* files.

mount -t ldiskfs /dev/sde /mnt/ost
pushd /mnt/ost
cd O
cd 0
cp -p LAST_ID /root/reformat/sde

The O directory exists, but it is empty.  What can I do concerning this missing LAST_ID file?  I mean, I probably have something, somewhere, from some previous recovery, but that is way, way out of date.

My intent is to recreate this OST with the same index, and then put it back into production.  All files were moved off the OST before reaching this state, so nothing else needs to be recovered here.


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