Thanks Sage, the cache system's look pretty great so far. Combined with
erasure coding it's really adding a lot of options.
-Michael
On 21/05/2014 21:54, Sage Weil wrote:
On Wed, 21 May 2014, Michael wrote:
Hi All,
Experimenting with cache pools for RBD, created two pools, slowdata-hot backed
by slowdata-cold. Set up max data to be stored in hot to be 100GB, data to be
moved to cold above 40% hot usage. Created a 100GB RBD image, mounted it
tested reading/writing, then dumped in 80GB of data. All looked to be going
well. Left everything to settle down and then unmounted the RBD and deleted
it. Afterwards:
pool name category KB objects clones degraded
unfound rd rd KB wr wr KB
slowdata-cold - 55835980 13817 0 0
0 27741 3 16818 67715123
slowdata-hot - 12 23610 0 0
0 1863785 112250386 150951 138481712
Deleting the RBD image cleaned out the hot pool's data but left the cold
pool full of data and both of them full of objects. Anyone else trying
this out?
This is normal. The cache pool contains a sort of "whiteout" that
indicates the object is deleted, but it isn't cold enough yet to have
flushed that change to the base pool. As you write more data you will
find the backend pool's objects for that image will eventually disappear.
sage
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