On Mon, May 30, 2016 at 12:45:07PM +0800, baotiao wrote: > This machine is running for qemu, the file is qemu qcow file type > > [root@w-openstack20 /data/nova/instances/7898b630-c4ef-49ab-9ce9-3735e090c282]# file disk > disk: QEMU QCOW Image (v3), has backing file (path /data/nova/instances/_base/3f27393376152ac352b2d85703011e38517e), 429496729600 bytes Oh, you're using delta/snapshot based qcow images. That, by it's very nature, generates fragmented image files as they are a delta over the backing file. .... > actual 48421430, ideal 20716, fragmentation factor 99.96% > > How can I solve this problem, what do you suggest me to do? Use a extent size hint (say 1-8MB) for your qcow2 image files so that they don't fragment badly as they are written to. Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
