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CONTAP-496940: CPLEDGER_CHECK_USED_BY_PLANE0 failed at CP [1568382, 1568382]: Volume delta 4252 != Inode/Bitmap delta 4256 Detected bitmap inconsistency on aggregate CNNDCML

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Issue

  • ONTAP node reboots unexpectedly with error:
    CPLEDGER_CHECK_USED_BY_PLANE0 failed at CP [1568382, 1568382]: Volume delta 4252 != Inode/Bitmap delta 4256 Detected bitmap inconsistency on aggregate MyAggregate
  • After the takeover, the partner can serve data for a short time but then hit the same preconditions, leading to the same unexpected reboot of the ha-partner node, leading to a full ha-pair-downtime
  • error messages leading towards the unexpected reboot might show auto-grow to fail when not configured properly and recompression scanners complaining about not enough space:
    Sun Jul 19 00:10:23 +0000 [MyCluster-01: wafl_exempt23: wafl.vol.full:alert]: Insufficient space on volume MyVolume@vserver:2a113ba0-f580-11e4-8e5f-00a098640375 to perform operation. 264KB was requested but only 1.00KB was available.
    Sun Jul 19 00:12:08 +0000 [MyCluster-01: wafl_exempt15: se.scan.filecg.stopped:error]: Recompression of file based compressed blocks to container level compression is halted because volume 'MyVolume' might run out of space during this procedure. SIS scan type 'DENSE_TSSE_COMPRESSION_GATHER'.
    Sun Jul 19 03:07:54 +0000 [MyCluster-01: wafl_spcd_main: wafl.vol.autoSize.fail:notice]: Unable to grow volume 'MyVolume@vserver:2a113ba0-f580-11e4-8e5f-00a098640375' to recover space: Volume cannot be grown beyond maximum growth limit.

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