Hello, On Fri, 20 Dec 2013 09:20:48 +0100 Dan van der Ster wrote: > Hi, > Our fio tests against qemu-kvm on RBD look quite promising, details here: > > https://docs.google.com/spreadsheet/ccc?key=0AoB4ekP8AM3RdGlDaHhoSV81MDhUS25EUVZxdmN6WHc&usp=drive_web#gid=0 > That data is very interesting and welcome, however it would be a lot more relevant if it included information about your setup (though it is relatively easy to create a Ceph cluster than can saturate GbE ^.^) and your configuration. For example I assume you're using the native QEMU RBD interface. How did you configure caching, just turned it on and left it at the default values? > tl;dr: rbd with caching enabled is (1) at least 2x faster than the > local instance storage, and (2) reaches the hypervisor's GbE network > limit in ~all cases except very small random writes. > > BTW, currently we have ~10 VMs running those fio tests in a loop, and > we're seeing ~25,000op/s sustained in the ceph logs. Not bad IMHO. Given the feedback I got from my "Sanity Check" mail, I'm even more interested in the actual setup you're using now. Given your workplace, I expect to be impressed. ^o^ > Cheers, Dan > CERN IT/DSS > [snip] Regards, Christian -- Christian Balzer Network/Systems Engineer chibi@xxxxxxx Global OnLine Japan/Fusion Communications http://www.gol.com/ _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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