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High latency during disk failure in ONTAP MCC-IP with ADP Partitioned Disks

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Category:
ontap-9
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perf
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Applies to

  • ONTAP 9
  • MetroCluster IP(MCC-IP)
  • Advanced Disk Partitioning (ADP)

Issue

  • During a disk failure event in an MCC-IP configuration with ADP, the affected volumes experienced high write latency.
  • SQL Server reported I/O requests taking longer than 15 seconds, leading to transaction errors and temporary service disruptions.
  • Example log output:
Mon Sep 15 18:53:19 +0800 [SiteB-01:scsi_cmdblk_strthr_admin:disk.timeout.flush.start:notice]: Aggressive timeout flush started on disk 0v.i2.1L31 S/N 44L0A17HTZ1H. Details: PowerCycled: true Reason: DiskSpasm.
Mon Sep 15 18:53:55 +0800 [SiteB-01:config_thread:raid.disk.offline:notice]: Marking Disk /SiteB_DATA_1/plex2/rg0/0v.i2.1L31P1 Shelf 0 Bay 25 offline.
  • SQL Server Error Log:
SQL Server has encountered 1 occurrence(s) of I/O requests taking longer than 15 seconds to complete on file templog.ldf (transaction log).

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