Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
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
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