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Lower than expected performance while utilizing a single volume

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Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

ONTAP 9

Issue

  • Lower than expected performance while utilizing a single volume
  • You may notice high latency on a volume, and CPU utilization is low.

Example:

  • The output of commands  sysstat, qos statistics volume performance show, and qos statistics volume latency show has high latency on vol1 only and CPU is low for the node.
  • Other volumes are not having latency
Cluster::> qos statistics volume latency show                                          

Workload            ID    Latency    Network    Cluster       Data       Disk        QoS      NVRAM      Cloud
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
-total-              -  1057.00us   118.00us    86.00us   210.00us   609.00us    34.00us        0ms        0ms
vol1-wid25471    25471    20.76ms   598.00us     2.44ms     7.37ms        0ms    10.35ms        0ms        0ms
vol2-wid15658    15658   428.00us   155.00us        0ms   273.00us        0ms        0ms        0ms        0ms
-total-              -     1.53ms   521.00us   153.00us   111.00us   158.00us   591.00us        0ms        0ms
vol1-wid25471    25471    48.54ms   932.00us     2.37ms   780.00us        0ms    44.46ms        0ms        0ms
vol2-wid15658    15658   316.00us   128.00us        0ms   188.00us        0ms        0ms        0ms        0ms
-total-              -   830.00us   134.00us    75.00us   125.00us   444.00us    52.00us        0ms        0ms
vol1-wid25471    25471    37.61ms   698.00us     1.92ms        0ms        0ms    34.99ms        0ms        0ms
vol2-wid15658    15658   471.00us   130.00us        0ms   341.00us        0ms        0ms        0ms        0ms

cluster1::> qos statistics volume performance show 
Workload            ID     IOPS       Throughput   Latency
--------------- ------ -------- ---------------- ----------
-total-              -     4993       859.84MB/s  1044.00us
vol1-wid25471    25471       81       569.00MB/s   522.28ms
vol2-wid47655    47655       80        68.33MB/s     2.30ms
vol3-wid43753    43753       72        61.00MB/s     2.12ms
vol4-wid27831    27831       70        60.67MB/s     2.12ms
vol5-wid17972    17972       62         8.42MB/s   829.00us
vol6-wid14310    14310       62         1.80MB/s   623.00us
vol7-wid51942    51942       62         3.14MB/s   689.00us
vol8-wid631        631       61         3.46MB/s   648.00us
vol9-wid43632    43632       59         3.09MB/s   633.00us
vol10-wid52828   52828       58         7.09MB/s  1065.00us
-total-              -     4604       872.46MB/s  1106.00us
vol1-wid25471    25471       70       560.67MB/s   152.15ms
vol2-wid47655    47655       70        59.33MB/s     2.15ms
vol3-wid43753    43753       70        60.33MB/s     2.33ms
vol4-wid27831    27831       70        60.67MB/s     2.14ms
vol5-wid17972    17972       65        15.11MB/s  1485.00us
vol6-wid14310    14310       62         8.45MB/s   977.00us
vol7-wid51942    51942       60         5.75MB/s   826.00us
vol8-wid631        631       58         4.42MB/s   613.00us
vol9-wid43632    43632       57         8.38MB/s   982.00us
vol10-wid52828   52828       56         4.41MB/s   574.00us
    

Cluster::> node run -node node1 -command sysstat -x 1
 CPU    NFS   CIFS   HTTP   Total     Net   kB/s    Disk   kB/s    Tape   kB/s   Cache  Cache    CP           CP_Ty               CP_Ph       Disk   OTHER    FCP  iSCSI     FCP   kB/s   iSCSI   kB/s
                                       in    out    read  write    read  write     age    hit  time  [T--H--F--N--B--O--#--:]  [n--v--p--f]   util                            in    out      in    out
 13%    261      3      0    2927  222768 258592     104       0       0      0    12    100%    0%   0--0--0--0--0--0--0--0    0--0--0--0      1%    2663      0      0       0      0       0      0
 15%    403      6      0    3040  255451 255197     116       0       0      0    12    100%    0%   0--0--0--0--0--0--0--0    0--0--0--0      2%    2631      0      0       0      0       0      0
  5%    348     10      0     811    6094   9894     232      24       0      0    12    100%    0%   0--0--0--0--0--0--0--0    0--0--0--0      2%     453      0      0       0      0       0      0
  2%    172     14      0     222    2795    535     840       0       0      0    12    100%    0%   0--0--0--0--0--0--0--0    0--0--0--0      2%      36      0      0       0      0       0      0
  2%    172     10      0     196    2358   1024     296      32       0      0    12    100%    0%   0--0--0--0--0--0--0--0    0--0--0--0      2%      14      0      0       0      0       0      0
  4%    179      4      0     185    1252   1725   30312    7788       0      0    12     96%   17%   1--0--0--0--0--0--0--0    0--0--0--1      7%       2      0      0       0      0       0      0
  6%    191      7      0    1243    7036   3093     892   35628       0      0    12    100%    9%   0--0--0--0--0--0--0--0    0--0--0--0      6%    1045      0      0       0      0       0      0
 11%    331     16      0    1884  211723 259196     508    3100       0      0    12     99%    5%   0--0--0--0--0--0--0--0    0--0--0--0      5%    1537      0      0       0      0       0      0
 11%    270     15      0    2163  233854 259417     560       0       0      0    12    100%    0%   0--0--0--0--0--0--0--0    0--0--0--0      2%    1878      0      0       0      0       0      0
 12%    380      5      0    2168  219803 258504     736      32       0      0    12    100%    0%   0--0--0--0--0--0--0--0    0--0--0--0      3%    1783      0      0       0      0       0      0
 12%    146      1      0    1791  211641 257702      84       0       0      0    12    100%    0%   0--0--0--0--0--0--0--0    0--0--0--0      1%    1644      0      0       0      0       0      0
 12%    614      3      0    2339  212750 259381     104       0       0      0    12    100%    0%   0--0--0--0--0--0--0--0    0--0--0--0      2%    1722      0      0       0      0       0      0
 13%    419      2      0    2508  213848 251174     232      24       0      0    12    100%    0%   0--0--0--0--0--0--0--0    0--0--0--0      3%    2087      0      0       0      0       0      0
 13%    262      3      0    2130  213556 259212     144       0       0      0    12    100%    0%   0--0--0--0--0--0--0--0    0--0--0--0      2%    1865      0      0       0      0       0      0
 14%    778      5      0    2433  226228 284261    2024      32       0      0    12     99%    0%   0--0--0--0--0--0--0--0    0--0--0--0      8%    1650      0      0       0      0       0      0
 13%    631      4      0    2454  224345 221650     104       0       0      0    12    100%    0%   0--0--0--0--0--0--0--0    0--0--0--0      1%    1819      0      0       0      0       0      0

 

 

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