On 04/07/14 02:32, VELARTIS Philipp D?rhammer wrote: > Ceph.conf: > rbd cache = true > rbd cache size = 2147483648 > rbd cache max dirty = 1073741824 Just a FYI - I posted a setting very like this in another thread, and remarked that it was "aggressive" - probably too much so for any but single purpose benchmarks using a handful of VMs - as it will add 2G to the memory footprint of *each* one [1]. If that was your intention, no worries - but I thought I should clarify it before I'm responsible for everyone eating all their RAM :-) Cheers Mark [1] e.g your qemu-system-x86_64 will expand its memory consumption by approx this amount.