Hi I wanted to share my findings of running ceph on HP servers. We had a lot of problems with CPU load, which was sometimes even 800. We were trying to figure out why this happens even while not doing anything special. Our OSD nodes are running DL380 G6 with Dual Quad core cpu's and 32gb memory. The solution we found to work was to set the following settings in bios HP Power Profile Mode: Maximum Performance Power Regulator Mode: Static High Performance IntelR Turbo Boost Technology: Disabled With these settings our loads never go over 20 and there are no "hangs" in writes or reads at any time. If anyone else has any experiences with these settings, I would appreciate to hear about your findings. The Turbo Boost, is, I would assume the biggest thing here. When CPU frequency is adjusted, the CPU's "hang" for a while to do the adjustment, and when the adjustment happens a lot, it creates this high load. Br, Tuomas -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.ceph.com/pipermail/ceph-users-ceph.com/attachments/20150526/e3d83fec/attachment.htm>
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