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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