Hi Vlad, On Wednesday, July 27, 2016, Vladislav Bolkhovitin <[email protected]> wrote:
> > Alex Gorbachev wrote on 07/27/2016 10:33 AM: > > One other experiment: just running blkdiscard against the RBD block > > device completely clears it, to the point where the rbd-diff method > > reports 0 blocks utilized. So to summarize: > > > > - ESXi sending UNMAP via SCST does not seem to release storage from > > RBD (BLOCKIO handler that is supposed to work with UNMAP) > > > > - blkdiscard does release the space > > How did you run blkdiscard? It might be that blkdiscard discarded big > areas, while ESXi > sending UNMAP commands for areas smaller, than min size, which could be > discarded, or > not aligned as needed, so those discard requests just ignored. I indeed ran blkdiscard on the whole device. So the question to the Ceph list is below what length discard is ignored? I saw at least one other user post a similar issue with ESXi-SCST-RBD. > > For completely correct test you need to run blkdiscard for exactly the > same areas, both > start and size, as the ESXi UNMAP requests you are seeing on the SCST > traces. I am running a test with the debug settings you provided, and will keep this thread updated with results. Much appreciate the guidance. Alex > > Vlad > > -- -- Alex Gorbachev Storcium
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