[Lustre-discuss] OSS Cache Size for read optimization

Oleg Drokin Oleg.Drokin at Sun.COM
Fri Apr 3 12:31:19 PDT 2009


Yes, it is for dirty cache limiting on a per-osc basis.
There is also /proc/fs/lustre/llite/*/max_cached_mb that regulates how  
much cached
data per client you can have. (default is 3/4 of RAM)

On Apr 3, 2009, at 2:52 PM, Lundgren, Andrew wrote:

> The parameter is called dirty, is that write cache, or is it read- 
> write?
>
>>
>> Current Lustre does not cache on OSTs at all. All IO is direct.
>> Future Lustre releases will provide an OST cache.
>>
>> For now, you can increase the amount of data cached on clients, which
>> might help a little. Client caching is set with
>> /proc/fs/lustre/osc/*/max_dirty_mb.
>>
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