Hi list, We're using CoW clones (using OpenStack via Glance and Cinder) to store virtual machine images. For example: > # rbd info cinder-volumes/volume-a09bd74b-f100-4043-a422-5e6be20d26b2 > rbd image 'volume-a09bd74b-f100-4043-a422-5e6be20d26b2': > size 25600 MB in 3200 objects > order 23 (8192 kB objects) > block_name_prefix: rbd_data.c569832b851bc > format: 2 > features: layering, striping > flags: > parent: glance-images/37a54104-fe3c-4e2a-a94b-da0f3776e1ac@snap > overlap: 4096 MB > stripe unit: 8192 kB > stripe count: 1 It seems our storage cluster writes a lot, also when the virtualization cluster isn't loaded at all and there seem to be more writes than reads. In general that is, which is quite odd and unexpected. In addition, performance is not as good as we would like. Can someone please share their thoughts on this matter and for example at flattening (or maybe not) the volumes. Thanks in advance! Cheers, Kees _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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