[Lustre-discuss] Performance problems with Lustre 1.6.1

[Juan Piernas Canovas]

Hi Kilian,

Thanks for your reply. Yes, I have also read that a deadlock can occur, 
but I have not had that problem so far.

I have forgotten to mention that if I use 8 independent files, one per 
OST, and every process reads the file in its OST, the performance is 
even better. Therefore, I assume (maybe, wrongly) that this is a 
consistency/synchronization problem when several process access to the 
same file, even when all of them are reading non-overlapped portions.

Regards,

    Juan.

Kilian CAVALOTTI wrote:
> Hi Juan,
>
> On Monday 01 October 2007 03:56:33 pm Juan Piernas Canovas wrote:
>   
>> I have set up a small Lustre file system with 1 MDS and 8 OSS/OST.
>> The particularity of our system is that every OSS is also a client of
>> the file system (there are 8 clients altogether).
>>     
>
> I'm not sure if that's related, but I recall reading in the Lustre 
> manual that running a client and an OST on the same machine could lead 
> to a whole range of unexpected results, including deadlocks:
> http://manual.lustre.org/manual/LustreManual16_HTML/DynamicHTML-26-1.html#wp1072362
>
> Cheers,
>