[Lustre-devel] MRP-203 obdfilter not able to serve more then 32 requests in parallel

Nathan Rutman Nathan_Rutman at xyratex.com
Wed Aug 24 12:12:46 PDT 2011

Thanks Oleg.
cc'ing lustre-devel

On Aug 24, 2011, at 11:22 AM, Oleg Drokin wrote:

	Increasing number of dirs is fine by me, but it has implications for upgrading and downgrading.
	For example I think number of dirs is really hardcoded everywhere instead of using value in server data.
	Also if you want to change the value on existing OST, we need a rehash functionality,
	and then using older releases on such filesystems would lead to corruptions which also needs to be avoided somehow.

On Aug 24, 2011, at 11:06 AM, Nathan Rutman wrote:

		currently we have to use 32 directories for object in OST. but for large scale OST it isn't enough. 
		so we need to able to extend that number to ~1024 or more.


	This was brought up at LUG (presentation attached below) and my recollection is that Oleg had some strong opinions on this -- maybe not increasing the number of dirs but certainly on any locking changes.  Oleg -- did you have any objection to increasing the number of object directories?
	130-200_Ben_Evans_LUG ... - OLCF.ORNL.GOV <http://www.olcf.ornl.gov/wp-content/events/lug2011/4-13-2011/130-200_Ben_Evans_LUG-2011_Ben_Evans_V3.pptx> 

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