Hi all, I have some fileserver with insufficient read speed. Enabling read ahead inside the VM improve the read speed, but it's looks, that this has an drawback during lvm-operations like pvmove.
For test purposes, I move the lvm-storage inside an VM from vdb to vdc1. It's take days, because it's 3TB data. After enbling read ahead (echo 4096 > /sys/block/vdb/queue/read_ahead_kb; echo 4096 > /sys/block/vdc/queue/read_ahead_kb) the move-speed drop noticeable! Are they any tunings to improve speed related to lvm on rbd-storage? Perhaps, if using partitions, align the partition on 4MB? Any hints? Udo _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
