On 31/5/17 22:20, CoolCold wrote:
top stat:
top - 12:09:03 up 4:55, 2 users, load average: 3.33, 3.18, 2.88
Tasks: 487 total, 4 running, 483 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.0 us, 4.5 sy, 0.0 ni, 95.3 id, 0.0 wa, 0.0 hi, 0.1 si, 0.0 st
KiB Mem : 13174918+total, 13005539+free, 1191212 used, 502584 buff/cache
KiB Swap: 9764860 total, 9764860 free, 0 used. 13020440+avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
22275 root 20 0 0 0 0 R 99.0 0.0 7:01.01 md1_raid10
this cpu usage 99-100% is constant.
Sorry, but doesn't that say 95.3% idle?
Do you have a multi core CPU? Is it multi threaded? What type of CPU is it?
When running top, press 1, it will then show you each individual core
and the stats for it.
You might find that creating 10 RAID1 devices, and then using linear
raid to join them together will perform better, from hearsay and memory,
this will allow you to use a CPU for each RAID1, and another CPU for the
linear, so if you had 11 CPU's (or more) then this should get you the
best possible outcome (from a CPU point of view). In fact, if you have
more than one CPU it would help.
Also, you might want to run a newer kernel, I think there was a lot of
work done on the resync parts to optimise that. You might also prefer to
focus on performance measurements *after* the resync has completed,
since that would be your "normal" status. Though in addition, you should
test performance with one lost disk, and while replacing that disk to
ensure that you are still able to sustain the required load during those
events.
Regards,
Adam
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