[Lustre-discuss] Lustre MDS Errors 1-7 and operation 101

[Thomas Roth]

Thanks, Andreas.

Andreas Dilger wrote:
>>
>>
>> error (-107) is /* Transport endpoint is not connected */  -   I have
>> seen this before on clients which had lost the connection to the
>> cluster. But this is on the MGS/MDS - one server with one partition for
>> the MGS and one for the MDT.
>> The second error suggests of course that the MGS is actually not
>> connected - but how can a Lustre system run when its MGS isn't there?
>> Makes no sense, does it?
> 
> It means some client is trying to perform operations on the MGS before
> it is connected.

Who? Before the client is connected, or before the MGS is connected?
Of course the client can't do something before it is connected? But the
MGS is connected in the sense that it is mounted and responsive - I can
do a fresh client mount of this system any time.
Maybe that's more semantics than Lustre. In any case, I am  reassured by
your comments, in particular since the cluster is doing fine in this
situation.

Regards,
Thomas

>> O.k., the cluster is running Debian Etch 64bit, Kernel 2.6.22, Lustre
>> 1.6.5.1.  The "operation 101" thing is supposed to have been solved in
>> the 1.6.4 -> 1.6.5 upgrade, according to the change logs.
> 
> There are a million things that might cause "operation 101" problems.
> 101 = LDLM_ENQUEUE, so this is just a lock enqueue.
>  
> Cheers, Andreas
> --
> Andreas Dilger
> Sr. Staff Engineer, Lustre Group
> Sun Microsystems of Canada, Inc.
> 

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Thomas Roth
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