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High latency observed on all volumes hosted on 7mode

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Category:
data-ontap-7
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7dot
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Applies to

  • Data ONTAP 7mode
  • Performance

Issue

  • Host report high disk latency alerts from Icinga Tool for VMs hosted on these volumes

2009317030 - server alerts.jpg

  • High latency identifed on disk utilization using sysstat -x 1 command :

Filer*> sysstat -x 1
 CPU    NFS   CIFS   HTTP   Total     Net   kB/s    Disk   kB/s    Tape   kB/s  Cache  Cache    CP  CP  Disk   OTHER    FCP  iSCSI     FCP   kB/s   iSCSI   kB/s
                                       in    out    read  write    read  write    age    hit  time  ty  util                            in    out      in    out
 50%   4103      2      0    4107   15431 191459  197658      8       0      0    18s    90%    0%  -    99%       2      0      0       0      0       0      0
 75%   4189      0      0    4197   19668 187389  292677  15835       0      0    17s    90%   36%  Fs  100%       8      0      0       0      0       0      0
 71%   3341      0      0    3358   19126 130803  272552 182357       0      0    18s    90%  100%  :s   98%      17      0      0       0      0       0      0
 68%   3478      0      0    3542   12713 148801  208659  61992       0      0    18s    91%  100%  :f  100%      64      0      0       0      0       0      0
 54%   4095      0      0    4096   11759 205888  214216  13968       0      0    18s    90%   34%  :    96%       1      0      0       0      0       0      0
 53%   4307      0      0    4310   15494 207465  218200      8       0      0    18s    90%    0%  -    95%       3      0      0       0      0       0      0
 48%   3984      0      0    3992   12258 177437  187736      0       0      0    17s    88%    0%  -    93%       8      0      0       0      0       0      0
 51%   4217      0      0    4218   16525 190835  201012     24       0      0    17s    89%    0%  -    99%       1      0      0       0      0       0      0
 52%   4433      3      0    4476   21521 203624  220932      0       0      0    17s    89%    0%  -    96%      40      0      0       0      0       0      0
 46%   3816      0      0    3817   15315 179245  192284      0       0      0    17s    89%    0%  -    94%       1      0      0       0      0       0      0
 53%   3494      2      0    3505   20996 145992  158036     32       0      0    17s    89%    0%  -    89%       9      0      0       0      0       0      0

  • Use statit to identify if high disk utilization or latency in the aggregate containing the volume.

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