On 21/10/2016 10:04, Eugene M. Zheganin wrote:
Hi.
On 21.10.2016 9:22, Steven Hartland wrote:
On 21/10/2016 04:52, Eugene M. Zheganin wrote:
Hi.
On 20.10.2016 21:17, Steven Hartland wrote:
Do you have atime enabled for the relevant volume?
I do.
If so disable it and see if that helps:
zfs set atime=off <volume>
Nah, it doesn't help at all.
As per with Jonathon what does gstat -pd and top -SHz show?
gstat (while ls'ing):
dT: 1.005s w: 1.000s
L(q) ops/s r/s kBps ms/r w/s kBps ms/w d/s kBps
ms/d %busy Name
1 49 49 2948 13.5 0 0 0.0 0 0 0.0
65.0| ada0
0 32 32 1798 11.1 0 0 0.0 0 0 0.0
35.3| ada1
Averagely busy then on rust.
gstat (while idling):
dT: 1.003s w: 1.000s
L(q) ops/s r/s kBps ms/r w/s kBps ms/w d/s kBps
ms/d %busy Name
0 0 0 0 0.0 0 0 0.0 0 0 0.0
0.0| ada0
0 2 2 255 0.8 0 0 0.0 0 0 0.0
0.1| ada1
top -SHz output doesn't really differ while ls'ing or idling:
last pid: 12351; load averages: 0.46, 0.49,
0.46 up 39+14:41:02 14:03:05
376 processes: 3 running, 354 sleeping, 19 waiting
CPU: 5.8% user, 0.0% nice, 16.3% system, 0.0% interrupt, 77.9% idle
Mem: 21M Active, 646M Inact, 931M Wired, 2311M Free
ARC: 73M Total, 3396K MFU, 21M MRU, 545K Anon, 1292K Header, 47M Other
Swap: 4096M Total, 4096M Free
PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND
600 root 39 0 27564K 5072K nanslp 1 295.0H 24.56% monit
0 root -17 0 0K 2608K - 1 75:24 0.00%
kernel{zio_write_issue}
767 freeswitch 20 0 139M 31668K uwait 0 48:29 0.00%
freeswitch{freeswitch}
683 asterisk 20 0 806M 483M uwait 0 41:09 0.00%
asterisk{asterisk}
0 root -8 0 0K 2608K - 0 37:43 0.00%
kernel{metaslab_group_t}
[... others lines are just 0% ...]
This looks like you only have ~4Gb ram which is pretty low for ZFS I
suspect vfs.zfs.prefetch_disable will be 1, which will crash the
performance.
Regards
Steve
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