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I/O Interruptions during manual aggregate relocation

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ontap-9
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nas
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Applies to

  • AFF-A900 (ONTAP 9.12.1P14)
  • FAS8200 (ONTAP 9.14.1P13)
  • Environments using NFS with VMware workloads
  • Manual Aggregate relocation(ARL)

Issue

  • During planned manual ARL operations in an ONTAP cluster, symptoms below were observed
  • Brief VM I/O interruptions and VM hangs
  • Increased CPU load and high-availability events reported by affected VMs

Audit log

Tue Dec 16 2025 20:11:15 [kern_audit:info:4314] 8003e80000000142:8003e80000000521 :: cluster1:console :: console :: cluster1:admin :: storage aggregate relocation start -node node-02 -destination node-01 -aggregate-list aggr2 -relocate-to-higher-version true :: Pending
Tue Dec 16 2025 20:11:15 [kern_audit:info:4314] 8003e80000000142:8003e80000000521 :: cluster1:console :: console :: cluster1:admin :: Question: Warning: Destination is running a... :: Pending
Tue Dec 16 2025 20:11:17 [kern_audit:info:4314] 8003e80000000142:8003e80000000521 :: cluster1:console :: console :: cluster1:admin :: Question: Warning: Destination is running a... : y :: Success
Tue Dec 16 2025 20:11:17 [kern_audit:info:4314] 8003e80000000142:8003e80000000521 :: cluster1:console :: console :: cluster1:admin :: storage aggregate relocation start -node node-02 -destination node-01 -aggregate-list aggr2 -relocate-to-higher-version true :: Success

  • ARL finished within 7 seconds

EMS

Tue Dec 16 20:11:17 [node-02: sfo_arl_worker: arl.aggrStart:notice]: Starting relocation of aggregate aggr2 at time 29490708598.
Tue Dec 16 20:11:22 [node-02: sfo_arl_worker: volmigrate.migrating:info]: Migrating volume aggr2 to node-01 (ID xxxxxxxxxx).
Tue Dec 16 20:11:22 [node-02: config_thread: raid.aggregate.relocate:info]: Aggregate aggr2: Prepared for 'relocation' operation.
Tue Dec 16 20:11:23 [node-02: sfo_arl_worker: volmigrate.result:info]: Migration of volume aggr2 to node-01 was successful.
Tue Dec 16 20:11:24 [node-02: sfo_arl_worker: arl.OpFinished:notice]: Aggregate relocation operation from the source node node-02 to the destination node node-01 finished in 7243 milliseconds. 'override-vetoes' set to false, and 'override-destination-checks' set to false.
Tue Dec 16 20:11:23 [node-01: wafl_spcd_main: monitor.volumes.one.ok:debug]: Aggregate aggr2 is OK.
Tue Dec 16 20:11:23 [node-01: config_thread: raid.config.online.req.ok:notice]: Aggregate aggr2 is mounted. Time taken to mount the aggregate was 615 milliseconds.

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