On Sun, Dec 8, 2013 at 8:33 PM, Mark Kirkwood <mark.kirkw...@catalyst.net.nz > wrote: > > I'd suggest testing the components separately - try to rule out NIC (and > switch) issues and SSD performance issues, then when you are sure the bits > all go fast individually test how ceph performs again. > > What make and model of SSD? I'd check that the firmware is up to date > (sometimes makes a huge difference). I'm also wondering if you might get > better performance by having (say) 7 osds and using 4 of the SSD for > journals for them.
Thanks, Mark. In my haste, I left out part of a paragraph... probably really a whole paragraph... that contains a pretty crucial detail. I had previously run rados bench on this hardware with some success (24-26MBps throughput w/ 4k blocks). ceph osd bench looks great. iperf on the network looks great. After my last round of testing (with a few aborted rados bench tests), I deleted the pool and recreated it (same name, crush ruleset, pg num, size, etc). That is when I started to notice the degraded performance.
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