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High CPU utilization on a Snapmirror Destination Node

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ontap-9
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Perf
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Applies to

  • ONTAP 9
  • Snapmirror DP relationships 

Issue 

  • Latency is seen when high CPU utilization occurs due to Snapmirror job in progress.

  • The top workloads for D blade utlization was WAFL SCAN, wafl cp , WAFL and snapmirror as per perf archive graphs.

  • Output of wafl scan status   shows  scanners like snap create summary update; block ownership calculation and volume deswizzling ( which is for snapmirror) scans happening.

  • Since this is the destination for snapmirror, so these scanners are expected.


::>system node run -node * -command wafl scan status

Node: xxxx
Volume xxx:
 Scan id                   Type of scan     progress
  603754     snap create summary update     block 496578 of 676206
  604189    block ownership calculation     block 469500 of 676205
Volume xxy:
 Scan id                   Type of scan     progress
  604343     snap create summary update     block 6452 of 45690
  604265     blocks used summary update     block 24304 of 45690

Volume abc:
 Scan id                   Type of scan     progress
  604291     snap create summary update     block 7689 of 59397
  604234     blocks used summary update     block 13233 of 59397
      55             volume deswizzling     snap 366, inode 183826 of 33554416. level 1 of normal files. Totals: Normal files: L1:1798785/3219086468 L2:6755/3234086207 L3:3369/1298071658 L4:0/0      Inode file: L0:0/0 L1:0/0 L2:0/0 L3:0/0 L4:0/0
 

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