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Multiple aggregates long CPs caused by failed Flash Cache

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50
Visibility:
Public
Votes:
0
Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

  • ONTAP 9
  • All FAS systems with NVMe-based Flash Cache

Issue

  • Multiple aggregates experience a long CP:
Mon Nov 21 18:55:17 CST [AI-A: wafl_exempt08: wafl.cp.toolong:error]: Aggregate SATA_03 experienced a long CP.
Mon Nov 21 18:57:32 CST [AI-A: wafl_exempt11: wafl.cp.toolong:error]: Aggregate SATA_02 experienced a long CP.
Mon Nov 21 18:58:43 CST [AI-A: wafl_exempt03: wafl.cp.toolong:error]: Aggregate SATA_01 experienced a long CP.
  • The external cache writes errors:
Tue Nov 08 02:00:11 CST [AI-A: wafl_exempt07: ems.engine.suppressed:debug]: Event 'extCache.io.writeError' suppressed 77 times in last 457317 seconds.
Tue Nov 08 02:00:11 CST [AI-A: wafl_exempt07: extCache.io.writeError:notice]: WAFL external cache I/O write error: Insertq_save: unable to alloc context chain, code 0
  • The card status is a failure in sysconfig -a output
slot 3: Flash Cache NVMe
Serial Number:      S3K6NX0M200744
Part Number:        119-00329
Hardware Revision:  A0
Firmware Version:   NA01
Model Name:         X3311A
Capacity:           1024 GB
Vendor Name:        Samsung
State:              failed
  • High latency is not observed.

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