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IO is suspended temporarily when implementing cluster switch replacement

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34
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0
Category:
ontap-9
Specialty:
CORE
Last Updated:

Applies to

  • ONTAP 9
  • Cisco Nexus 9336C-FX2

Issue

vdbench

[2025-03-07 16:42:27.027] 16:42:27.045 540 1958.00 15.30 8192 20.02 0.471 0.601 0.438 2.925 0.195 0.9 16.0 10.8
[2025-03-07 16:42:41.356]
[2025-03-07 16:42:41.356] 3 07, 2025 interval i/o MB/sec bytes read resp read write resp resp queue cpu% cpu%
[2025-03-07 16:42:41.356] rate 1024**2 i/o pct time resp resp max stddev depth sys+u sys
[2025-03-07 16:42:41.356] 16:42:28.046 541 946.00 7.39 8192 19.77 0.428 0.497 0.411 3.656 0.136 113.4 7.8 4.1
[2025-03-07 16:42:41.356] 16:42:29.046 542 0.00 0.00 0 0.00 0.000 0.000 0.000 0.000 0.000 256.1 4.6 3.0
[2025-03-07 16:42:41.356] 16:42:30.046 543 0.00 0.00 0 0.00 0.000 0.000 0.000 0.000 0.000 256.0 4.6 2.6
[2025-03-07 16:42:41.357] 16:42:31.046 544 0.00 0.00 0 0.00 0.000 0.000 0.000 0.000 0.000 256.0 4.5 3.0
[2025-03-07 16:42:41.357] 16:42:32.049 545 0.00 0.00 0 0.00 0.000 0.000 0.000 0.000 0.000 255.9 6.0 2.5
[2025-03-07 16:42:41.384] 16:42:33.045 546 0.00 0.00 0 0.00 0.000 0.000 0.000 0.000 0.000 256.3 4.1 1.5
[2025-03-07 16:42:41.384] 16:42:34.045 547 0.00 0.00 0 0.00 0.000 0.000 0.000 0.000 0.000 255.6 6.0 3.0
[2025-03-07 16:42:41.384] 16:42:35.045 548 0.00 0.00 0 0.00 0.000 0.000 0.000 0.000 0.000 256.1 4.1 2.6
[2025-03-07 16:42:41.384] 16:42:36.045 549 0.00 0.00 0 0.00 0.000 0.000 0.000 0.000 0.000 255.9 5.0 2.5
[2025-03-07 16:42:41.384] 16:42:37.045 550 0.00 0.00 0 0.00 0.000 0.000 0.000 0.000 0.000 256.1 4.6 1.5
[2025-03-07 16:42:41.384] 16:42:38.045 551 0.00 0.00 0 0.00 0.000 0.000 0.000 0.000 0.000 255.8 4.6 2.5
[2025-03-07 16:42:41.413] 16:42:39.049 552 0.00 0.00 0 0.00 0.000 0.000 0.000 0.000 0.000 256.1 4.6 1.0
[2025-03-07 16:42:41.413] 16:42:40.045 553 0.00 0.00 0 0.00 0.000 0.000 0.000 0.000 0.000 256.1 4.6 2.5
[2025-03-07 16:42:41.413] 16:42:41.046 554 0.00 0.00 0 0.00 0.000 0.000 0.000 0.000 0.000 255.9 4.1 1.5
[2025-03-07 16:42:42.018] 16:42:42.045 555 0.00 0.00 0 0.00 0.000 0.000 0.000 0.000 0.000 256.1 3.1 1.5
[2025-03-07 16:42:43.016] 16:42:43.045 556 0.00 0.00 0 0.00 0.000 0.000 0.000 0.000 0.000 255.9 4.6 2.0
[2025-03-07 16:42:44.024] 16:42:44.045 557 0.00 0.00 0 0.00 0.000 0.000 0.000 0.000 0.000 256.1 4.6 3.1
[2025-03-07 16:42:45.030] 16:42:45.049 558 8624.00 67.38 8192 17.95 517.602 483.260 525.115 17170.839 2900.045 255.6 22.3 10.9

sysstat

::> system node run -node tststdt601 -command sysstat -u
[2025-03-07 16:42:17.093]  CPU   Total     Net   kB/s    Disk   kB/s    Tape   kB/s  Cache  Cache    CP           CP_Ty            Disk
[2025-03-07 16:42:17.093]        ops/s      in    out    read  write    read  write    age    hit  time  [T--H--F--N--B--O--#--:]  util
[2025-03-07 16:42:27.592]  18%    1865    9670   5470   10243 193013       0      0     2     98%   60%   0--0--0--0--0--0--0--0     0%
[2025-03-07 16:42:29.083]   2%       0    4788    365       0     16       0      0     2     99%    0%   0--0--0--0--0--0--0--0     0%
[2025-03-07 16:42:30.586]   1%       0      28     30      21   3896       0      0     2    100%    1%   0--0--0--0--0--0--0--0     0%
[2025-03-07 16:42:32.094]   4%       0      45     30       0     24       0      0     2     95%    0%   0--0--0--0--0--0--0--0     0%
[2025-03-07 16:42:33.594]   2%       0      37     42       8      0       0      0     2     97%    0%   0--0--0--0--0--0--0--0     0%
[2025-03-07 16:42:35.094]   2%       0      24     22       8     16       0      0     2     98%    0%   0--0--0--0--0--0--0--0     0%
[2025-03-07 16:42:36.594]   6%       0      34     34       8     29       0      0     2    100%    0%   0--0--0--0--0--0--0--0     0%
[2025-03-07 16:42:38.094]   3%       0       3      5    6445  33792       0      0     2     99%   16%   0--0--0--0--0--0--0--0     0%
[2025-03-07 16:42:39.581]   1%       0      23     24      16     16       0      0     2     98%    0%   0--0--0--0--0--0--0--0     0%
[2025-03-07 16:42:41.082]   4%     134     196     75     464   3797       0      0     2    100%    2%   0--0--0--0--0--0--0--0     0%
[2025-03-07 16:42:42.595]   2%      12    1029     40       8     16       0      0     2     96%    0%   0--0--0--0--0--0--0--0     0%
[2025-03-07 16:42:44.083]   1%      24      10     16       0     16       0      0     2     99%    0%   0--0--0--0--0--0--0--0     0%

  • IO goes through direct path during the procedure

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