[Lustre-discuss] Seeing OST errors on the OSS that doesnt have it mounted

Alex Lee alee at datadirectnet.com
Wed Aug 27 20:41:24 PDT 2008


Andreas Dilger wrote:
> On Aug 26, 2008  22:56 -0700, Alex Lee wrote:
>   
>> I'm getting these error messages on my OSS. However the OST006 is not mounted on this OSS(lustre-oss-0-0).  OST0006 is visible to the server because lustre-oss-0-0 is the failover node for lustre-oss-0-1 which does mount OST0006.
>>
>> Should I be worried about these errors? I dont understand why the OSS is even giving these errors out since there is no hardware issue that I can see. Also the OST is not mounted on that OSS I would think its "invisible" to the OSS.
>>
>> I only get these errors during lustre usage. When the filesystem is not used I never get any errors.
>>     
>
> When a client has a problem accessing a service (OST or MDT) on the primary
> node (e.g. RPC timeout) it will retry on the same node first, then try the
> backup and continue to try both until one of them answers...
>
>   
>> Aug 23 12:27:52 lustre-oss-0-0 kernel: LustreError: 2918:0:(ldlm_lib.c:1536:target_send_reply_msg()) @@
>> @ processing error (-19)  req at ffff81026f189a00 x52/t0 o8-><?>@<?>:0/0 lens 240/0 e 0 to 0 dl 1219462372
>>  ref 1 fl Interpret:/0/0 rc -19/0
>>     
>
> The fact that lustre-oss-0-0 returns -ENODEV (-19) isn't a reason to stop
> trying there, because it may take some time for OST to failover from primary
> server to backup.
>
> What this really means is that your primary server is having network
> trouble, or is so severely overloaded that the client has given up on
> it and is trying the backup.  It could also be a problem on the client
> I guess.
>
> Cheers, Andreas
> --
> Andreas Dilger
> Sr. Staff Engineer, Lustre Group
> Sun Microsystems of Canada, Inc.
>
>   

Andreas,

Thanks for the info.

Is there any documentation on how to decode the error messages? I feel 
bad keep posting on the list for every single error message I dont 
understand.

Thanks,
-Alex



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