[Lustre-discuss] OST crash with group descriptors corrupted

[thhsieh]

Hello,

I am wondering that, whether it is possible to give up that
problematic OST, and only make the other OSTs active, so that
we can rescue part of the data files ?

Now we have totally 6 OSTs, and one of the OST has problem
that I have no idea to repair now. If now I only activate
the 5 OSTs, could I get back (at most) 5/6 of data files,
or I can just get back junk files (since the files are
divided into fragments and are distributed into all OSTs) ?

If only activates the 5 OSTs can get back some data files,
what's the procedure I could do ?

Because I am under time pressure to recover the system.
Hence I am considering the worst situation ....

Thanks so much for your kindly reply.


Best Regards,

T.H.Hsieh


On Tue, Mar 10, 2009 at 10:56:17PM +0800, thhsieh wrote:
> Hello,
> 
> We have done it without "-n" command augument.
> Hence the filesystem is modified.
> 
> Best Regards,
> 
> T.H.Hsieh
> 
> 
> On Tue, Mar 10, 2009 at 10:04:24AM -0400, Brian J. Murrell wrote:
> > On Tue, 2009-03-10 at 18:14 +0800, thhsieh wrote:
> > > Hello,
> > 
> > Hi.
> > 
> > > Thanks very much for your kindly reply.
> > 
> > NP.
> > 
> > > We did the e2fsck (version 1.41.4) on all the OST partitions.
> > 
> > You did that with or without "-n" in the command arguments?
> > 
> > > [80083.964462] LDISKFS-fs: group descriptors corrupted!
> > > [81423.119834] LDISKFS-fs error (device sdb1): ldiskfs_check_descriptors: Checksum for group 11165 failed (0!=20224)
> > 
> > Hrm.  I don't know enough about the innards of ext3 to parse that.
> > Maybe (well, no maybes about it) Andreas will know if he is reading.
> > 
> > > We tried e2fsck with superblock 32768, but after some error
> > > corrections again we encounter the same problem.
> > 
> > Again, with our without e2fsck's "-n" argument?
> > 
> > b.
> > 
> 
> 
> 
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> 
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