On Wed, 2014-08-06 at 08:05 -0700, Sage Weil wrote: > BTW, do we still need to use something != virtio in order for > trim/discard? This was also my first concern when virtio was suggested. We were using ide primarily so we could take advantage of discard. The vms we will be supporting are more pets than cattle so we'll want to reclaim any space they're not using. For the record I am getting significantly better performance on my fio tests with io='native' and bus='virtio' changes in the guest. vnstat on the OSD nodes still doesn't show the peak throughput numbers that I get using the rbd kernel module, but it's in the neighborhood at any rate. I see that the latest version of fio can use rbd directly so maybe I'll run my tests that way so I can separate librbd performance from qemu performance. Thanks for all the help! Tregaron
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