Check out http://ceph.com/docs/master/rados/operations/pools/#set-pool-values
"Hit sets" are bloom filters which we use to track which objects are
accessed ("hit") during a specific time period (hit_set_period). More
hit sets within a given time let us distinguish more fine-grained
accesses to them, but require more tracking space. If you're trying to
flush dirty data out of the cache pool more quickly, you'll want to
adjust the dirty age values more than the hit set values.
-Greg
Software Engineer #42 @ http://inktank.com | http://ceph.com
On Mon, Aug 11, 2014 at 7:11 PM, Никитенко Виталий <[email protected]> wrote:
> Hi!
> I can not understand the meaning of the parameter hit_set_period. This is the
> minimum time then begin flush changed data from cache to based pool? Or this
> time after which the not changed data is deleted from cache pool?
> For example: there is a pool main_pool on 4 OSD and ssd_pool on ssd disk. I
> set the cache ssd_pool for main_pool and set hit_set_period 3600. Begin
> write a virtual machine to main_pool. After some time the image of the
> virtual machine will be located on the main pool? I want know, what period
> of time i lost data then ssd will break.
> Thank
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