Hello, On Thu, 6 Aug 2015 21:41:00 +0000 Sai Srinath Sundar-SSI wrote: > Hi, > I was using RADOS bench to test on a single node ceph cluster with a > dedicated SSD as storage for my OSD. I created a pool to do the same and > filled up my ssd until maximum capacity using RADOS bench with my object > size as 4k. On removing the pool, I noticed that it seems to take a > really long time for the OSD to delete the pool. In fact it seems to > delete at the rate of ~60 GB an hour. On trying this with 4MB objects > however, the same process only takes a couple of minutes. Has anyone > else observed similar behavior like this and can comment on the same? > Thanks Sai Srinath Sundar Deletion of objects is (among other Ceph operations) a very costly process. People run into this frequently and it has been discussed here. The deletion of an object comes with a "fixed cost" (I/O, updating maps) and with 4KB objects you have 1000 times more objects than with 4MB ones. You should be happy that isn't 1000 times slower (as far as I can see from your mail). Regards, Christian -- Christian Balzer Network/Systems Engineer chibi@xxxxxxx Global OnLine Japan/Fusion Communications http://www.gol.com/ _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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