zfs forgetting cache wedges?

To: NetBSD current-users mailing list <current-users%NetBSD.org@localhost>
Subject: zfs forgetting cache wedges?
From: Frank Kardel <kardel%netbsd.org@localhost>
Date: Mon, 28 Sep 2020 11:54:33 +0200

Hi, is it normal that ZFS sort of forgets its cache configuration?

Given this configuration:

NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUPHEALTH ALTROOTpool-1 8.94T 2.76T 6.17T - 5% 30% 1.11xONLINE -

  raidz1              8.94T  2.76T  6.17T         -     5%    30%
    wedges/zfs10g0-0      -      -      -         -      -      -
    wedges/zfs10g1-0      -      -      -         -      -      -
    wedges/zfs10g2-0      -      -      -         -      -      -
cache                     -      -      -         -      -      -
  wedges/zfs-c1        256G  4.40G   252G         -     0%     1%

After a boot it looks like this:

NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUPHEALTH ALTROOTpool-1 8.94T 2.76T 6.17T - 5% 30% 1.11xONLINE -

  raidz1              8.94T  2.76T  6.17T         -     5%    30%
    wedges/zfs10g0-0      -      -      -         -      -      -
    wedges/zfs10g1-0      -      -      -         -      -      -
    wedges/zfs10g2-0      -      -      -         -      -      -
cache                     -      -      -         -      -      -
  384839849488            -      -      -         -      -      -

The cache wedge does not look very usable in that state.

Removing the device and adding it again gives a working cache deviceuntil the next reboot.


What am I doing wrong or what needs to be fixed?

Frank

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- Re: zfs forgetting cache wedges?
  - From: Michael van Elst

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