Lustre discuss - May 2010 - How to eliminate an OST from an OSS server

Dear,

I have a pre-installed lustre file-system with two MDSs and two OSSs. Each OSS
has 6 arrays of disks. In OSS01, one of the arrays is not working properly due
to a physical error in one of the disks of the array. I wanted to eliminate this
array from OSS01. Simply I restarted MDSs and the OSSs and didn''t mount
that array. Then I mounted the file-system on the clients. The clients
didn''t produce any error after mounting but the file-system is not
accessible; i.e. I can''t even issue an "ls" command to view
the contents of the file-system. I need to eliminate that corrupted array to be
able to use the file-system but don''t know how. Could anyone help me
with that or just guide me what should I read to learn how to fix this issue.

Thank you,
Mohamed Adel
Bibliotheca Alexandrina

On Wed, 2010-05-26 at 09:43 +0300, Mohamed Adel wrote: 
> Dear,
> 
> I have a pre-installed lustre file-system with two MDSs and two OSSs. Each
OSS has 6 arrays of disks. In OSS01, one of the arrays is not working properly
due to a physical error in one of the disks of the array. I wanted to eliminate
this array from OSS01. Simply I restarted MDSs and the OSSs and didn''t
mount that array. Then I mounted the file-system on the clients. The clients
didn''t produce any error after mounting but the file-system is not
accessible; i.e. I can''t even issue an "ls" command to view
the contents of the file-system. I need to eliminate that corrupted array to be
able to use the file-system but don''t know how.
You likely want to deactivate the OST on the MDT and possibly on the
clients also, depending on your goals.
> Could anyone help me with that or just guide me what should I read to learn
how to fix this issue.
Have you checked the operations manual at
http://wiki.lustre.org/index.php/Lustre_Documentation?

Maybe you did but you just didn''t realize "deactivate" was
the operation
you were looking to perform.

Cheers,
b.

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