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CONTAP-426766: EMS logs reports WAFL inconsistency for bad compressed block at VBN

  1. Last updated
    Jun 10, 2025
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101
Visibility:
Public
Votes:
0
Category:
ontap-9
Specialty:
CORE
Last Updated:
6/10/2025, 11:06:50 AM

Issue

NetApp has identified a software issue on FAS and Cloud Volumes ONTAP products involving an interaction between Flash Cache and FabricPool (FP) that may result in a condition where incorrect data can be returned to clients after a failover.
Symptoms:

  • Failed read(s) back to the client
    • The node may log an EMS entry indicating the failure (see example below)
  • Client Application fails or detects data inconsistency

Sample EMS log entry:
  wafl.incons.compressed.buf: WAFL inconsistent: bad compressed block at VBN XXXXXXXXXXX (vvbn:XXXXXXXXXX fbn:XXXX level:X compression group first vbn:XXXXXXX compression group size X) in inode (fileid:XXXXXXX snapid:X) in volume volname@vserver:XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX.

 

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