On 03/15/2015 07:54 PM, Mike Christie wrote: > On 03/09/2015 11:15 AM, Nick Fisk wrote: >> Hi Mike, >> >> I was using bs_aio with the krbd and still saw a small caching effect. I'm >> not sure if it was on the ESXi or tgt/krbd page cache side, but I was >> definitely seeing the IO's being coalesced into larger ones on the krbd > > I am not sure what you mean here. By coalescing you mean merging right? > That is not the same as caching. Coalescing/merging is expected for both > aio and rdwr. For being able to see caching with aio though, I think you are right and there might be a case where can use buffered writes even when using O_DIRECT to the rbd device. I am not too familiar with that code, so let me ping a person that works here and get back to the list. _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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