[Lustre-discuss] write RPC & congestion

Cory Spitz spitzcor at cray.com
Tue Sep 28 09:53:47 PDT 2010


The Lustre Operations Manual only covers configuration and tuning for XT3
running Catamount.  However, the tuneables you are concerned about relate more
to what kind and how much storage you have and less about XT specific tunings.


On 09/27/2010 05:59 PM, burlen wrote:
>   On 09/24/2010 06:36 PM, Andreas Dilger wrote:
>> On 2010-09-24, at 19:10, Andreas Dilger wrote:
>>> On 2010-09-24, at 18:20, burlen wrote:
>>>> To be sure I understand this, is it correct that each OST has its own pool of service threads? So system wide number of service threads is bound by oss_max_threads*num_osts?
>>> Actuall, the current oss_max_threads tunable is for the whole OSS (as the name implies).
> Again many thanks for your help
> With respect to an upper bound on number of rpcs and RMDAs in flight 
> system wide, does the situation change much on the Cray XT5 with Lustre 
> 1.8 and OSSs directly connected to the 3d torus? I am asking after 
> having seen the XT3 section in manual. not sure if it applies to XT5 and 
> if it does how this might influence the above tunables.
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