[Lustre-discuss] [HPDD-discuss] Recovering a failed OST
Bob Ball
ball at umich.edu
Mon May 19 11:24:22 PDT 2014
Oh, better still, as I kept looking, and the low-level panic retreated,
I found this on the mdt:
[root at lmd02 ~]# lctl get_param osc.*.prealloc_next_id
...
osc.umt3-OST0025-osc.prealloc_next_id=6778336
So, unless someone tells me that I am way off base, I'm going to proceed
with the assumption that this is a valid starting point, and proceed to
get my file system back online.
bob
On 5/19/2014 2:05 PM, Bob Ball wrote:
> 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,
> bob
>
>
> 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.
>>
>> Thanks,
>> bob
>>
>> _______________________________________________
>> HPDD-discuss mailing list
>> HPDD-discuss at lists.01.org
>> https://lists.01.org/mailman/listinfo/hpdd-discuss
>>
>
>
>
> _______________________________________________
> HPDD-discuss mailing list
> HPDD-discuss at lists.01.org
> https://lists.01.org/mailman/listinfo/hpdd-discuss
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.lustre.org/pipermail/lustre-discuss-lustre.org/attachments/20140519/74281d97/attachment.htm>
More information about the lustre-discuss
mailing list