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Performance impact using Volume Move

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Applies to

  • ONTAP 9
  • Volume move

Issue

  • Increased latency can be seen on Disk and/or Data Delay Center (D-blade) in qos statistics output due to volume moves
  • There may also be high cpu activity / utilization seen.
  • Note: Data latency during volume move is rare due to being a background process on CPU

Example: The following commands show high disk latency or Data latency while a volume move is running

nas1::> qos statistics volume latency show -volume data -vserver data_svm3
Workload            ID    Latency    Network    Cluster      Data       Disk        QoS
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------
-total-              -     0.00us     0.00us    0.00us   000.00us        0ms        0ms
data-wid307        307   300.00ms     0.00us       0ms   150.00ms   150.00ms        0ms
-total-              -     0.00us     0.00us    0.00us   000.00us        0ms        0ms
data-wid307        307   892.00ms     0.00us       0ms    92.00ms   800.00ms        0ms
-total-              -     0.00us     0.00us    0.00us   000.00us        0ms        0ms
data-wid307        307   125.00ms     0.00us       0ms    25.00ms   100.00ms        0ms
-total-              -     0.00us     0.00us    0.00us   000.00us        0ms        0ms
data-wid307        307   332.00ms     0.00us       0ms   300.00ms    32.00ms        0ms

nas1::> volume move show
Vserver   Volume     State    Move Phase Percent-Complete Time-To-Complete
--------- ---------- -------- ---------- ---------------- ----------------
data_svm3   data     alert    replicating    98%  Wed Sep 30 22:58:25 2022

 

 

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