[Bug 1877892] Re: lvmcache man page lacks warning about unclean shutdowns

[pauldoo]

I raised this on linux-lvm mailing list recently, and included links
there to previous posts of this problem: https://www.redhat.com/archives
/linux-lvm/2020-May/msg00000.html

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https://bugs.launchpad.net/bugs/1877892

Title:
  lvmcache man page lacks warning about unclean shutdowns

Status in lvm2 package in Ubuntu:
  New

Bug description:
  Hello,
  The man page for lvmcache lacks any warnings about the behaviour of lvmcache when unclean shutdowns occur.  In particular an unclean shutdown results in the entire cache being marked dirty on next boot and a lengthy write out of the entire cache begins.  This occurs regardless of the mode (writethrough or writeback).

  This behaviour has been raised previously on upstream linux-lvm and
  dm-devel mailing lists, but the situation has not changed since at
  least 2014.  I don't expect the implementation to be changed therfor,
  only that the documentation be updated to highlight this behaviour.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: lvm2 2.03.07-1ubuntu1
  ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
  Uname: Linux 5.4.0-29-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Sun May 10 20:55:55 2020
  SourcePackage: lvm2
  UpgradeStatus: Upgraded to focal on 2020-04-24 (15 days ago)

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