Dear all, I have installed DRBD 8.3.11 compiled from sources. However the backend block will freeze if there is high IO load. I use Remus to support high availability and checkpointing is controlled by remus for each 400ms. If I check the Iostat I got the idle CPU will decreasing extremely each checkpointing and when its reach 0% of idle cpu the local backing device will freeze and damage the replication. Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn drbd1 0.00 0.00 0.00 0 0 avg-cpu: %user %nice %system %iowait %steal %idle 1.52 0.00 6.09 0.00 0.00 92.39 Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn drbd1 0.00 0.00 0.00 0 0 avg-cpu: %user %nice %system %iowait %steal %idle 41.24 0.00 12.37 0.00 0.52 45.88 Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn drbd1 55.15 131.96 1327.84 256 2576 avg-cpu: %user %nice %system %iowait %steal %idle 70.85 0.00 29.15 0.00 0.00 0.00 Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn drbd1 50.25 128.64 711.56 256 1416 avg-cpu: %user %nice %system %iowait %steal %idle 54.73 0.00 45.27 0.00 0.00 0.00 Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn drbd1 5.97 127.36 37.81 256 76 avg-cpu: %user %nice %system %iowait %steal %idle 39.50 0.00 60.50 0.00 0.00 0.00 Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn drbd1 2.50 68.00 0.00 136 0 avg-cpu: %user %nice %system %iowait %steal %idle 35.00 0.00 65.00 0.00 0.00 0.00 Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn drbd1 15.00 138.00 66.00 276 132 avg-cpu: %user %nice %system %iowait %steal %idle 32.50 0.00 67.50 0.00 0.00 0.00 Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn drbd1 77.50 138.00 1890.00 276 3780 avg-cpu: %user %nice %system %iowait %steal %idle 33.00 0.00 67.00 0.00 0.00 0.00 Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn drbd1 14.50 128.00 264.00 256 528 avg-cpu: %user %nice %system %iowait %steal %idle 27.64 0.00 72.36 0.00 0.00 0.00 Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn drbd1 31.66 72.36 470.35 144 936 avg-cpu: %user %nice %system %iowait %steal %idle 32.00 0.00 68.00 0.00 0.00 0.00 Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn drbd1 0.00 0.00 0.00 0 0 avg-cpu: %user %nice %system %iowait %steal %idle 26.37 0.00 73.63 0.00 0.00 0.00 Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn drbd1 6.47 127.36 33.83 256 68 avg-cpu: %user %nice %system %iowait %steal %idle 27.50 0.00 72.50 0.00 0.00 0.00 Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn drbd1 4.00 128.00 0.00 256 0 avg-cpu: %user %nice %system %iowait %steal %idle 27.50 0.00 72.50 0.00 0.00 0.00 Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn drbd1 4.00 128.00 0.00 256 0 avg-cpu: %user %nice %system %iowait %steal %idle 29.50 0.00 70.50 0.00 0.00 0.00 I am also considering drbd optimization but its came with no luck. Hopefully some one would shared his experience. Best Regards, Agya _______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users