[Lustre-discuss] Lustre client question

[Kevin Van Maren]

See bug 24264 -- certainly possible that the raid controller corrupted  
your filesystem.

If you remove the new drive and reboot, does the file system look  
cleaner?

Kevin


On May 13, 2011, at 11:39 AM, Zachary Beebleson <zbeeble at math.uchicago.edu 
 > wrote:

>
> We recently had two raid rebuilds on a couple storage targets that  
> did not go
> according to plan. The cards reported a successful rebuild in each  
> case, but
> ldiskfs errors started showing up on the associated OSSs and the  
> effected OSTs
> were  remounted read-only. We are planning to migrate off the data,  
> but we've
> noticed that some clients are getting i/o errors, while others are  
> not. As an
> example, a file that has a stripe on at least one affected OST could  
> not be
> read on one client, i.e. I received a read-error trying to access  
> it, while it
> was perfectly readable and apparently uncorrupted on another (I am  
> able to
> migrate the file to healthy OSTs by copying to a new file name). The  
> clients
> with the i/o problem see inactive devices corresponding to the read- 
> only OSTs
> when I issue a 'lfs df', while the others without the i/o problems  
> report the
> targets as normal. Is it just that many clients are not aware of an  
> OST problem
> yet? I need clients with minimal I/O disruptions in order to migrate  
> as much
> data off as possible.
>
> A client reboot appears to awaken them to the fact that there are  
> problems with
> the OSTs. However, I need them to be able to read the data in order  
> to migrate
> it off. Is there a way to reconnect the clients to the problematic  
> OSTs?
>
> We have dd-ed copies of the OSTs to try e2fsck against them, but the  
> results
> were not promising. The check aborted with:
>
> ------
> Resize inode (re)creation failed: A block group is missing an inode
> table.Continue? yes
>
> ext2fs_read_inode: A block group is missing an inode table while  
> reading inode
> 7 in recreate inode
> e2fsck: aborted
> ------
>
> Any advice would be greatly appreciated.
> Zach
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