Am 22.05.2012 22:49, schrieb Greg Farnum:
Anyway, it looks like you're just paying a synchronous write penalty
What does that exactly mean? Shouldn't one threaded write to four
260MB/s devices gives at least 100Mb/s?
since with 1 write at a time you're getting 30-40MB/s out of rados bench, but with 16 you're getting>100MB/s.
>(If you bump up past 16 or increase the size of each with -b you may
find yourself getting even more.)
yep noticed that.
So try enabling RBD writeback caching — see http://marc.info/?l=ceph-devel&m=133758599712768&w=2
will test tomorrow. Thanks.
Stefan
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