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Data inaccessible during the Brocade switch firmware upgrade on fabric MetroCluster

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Applies to

  • ONTAP 9.8P18
  • MetroCluster FC

Issue

  • During a planned Brocade switch firmware upgrade in a MetroCluster FC environment, users experienced:Loss of connection to NAS (CIFS) file shares and applications.
  • Long CP (Consistency Point) delays, causing I/O to be unresponsive for up to 90–100 seconds;CIFS “Operation Timed Out” errors.
 
Example EMS log output:
 
[CLuster1:wafl_exempt07:wafl.cp.toolong:error]: Aggregate data_aggr experienced a long CP.
[CLuster1:slifc_asyncd_3:scsi.cmd.selectionTimeout:error]: Disk device switch1:9.126L1031: Adapter/target error: ... Targeted device did not respond to requested I/O. I/O will be retried.
[CLuster1:bg_disk_fw_update_admin:bdfu.selected:info]: Disk switch1:9.126L1034 ... selected for background disk firmware update.

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