Package: lvm2
Version: 2.03.02-3
Severity: wishlist

Dear Maintainer,

when trying to use the cleaner cachepolicy in writeback mode, lvm2 fails like 
this:

   Cache mode "writeback" is not compatible with cache policy "cleaner".

However, the kernel suports this combination, which is very useful to
avoid cache migrations but sitll have a hotspot writeback cache.

It would be nice if lvm2 also supported this combination (can't see why it
dosn't, in fact).

-- System Information:
Debian Release: 10.5
  APT prefers stable
  APT policy: (990, 'stable'), (500, 'unstable-debug'), (500, 'testing-debug'), 
(500, 'stable-updates'), (500, 'stable-debug'), (500, 'unstable'), (500, 
'testing'), (1, 'experimental-debug'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386, x32

Kernel: Linux 5.6.19-050619-generic (SMP w/8 CPU cores)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, 
TAINT_UNSIGNED_MODULE
Locale: LANG=en_DK.UTF-8, LC_CTYPE=en_DK.UTF-8 (charmap=UTF-8), 
LANGUAGE=en_DK.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages lvm2 depends on:
ii  dmeventd                  2:1.02.155-3
ii  dmsetup                   2:1.02.171-3
ii  libaio1                   0.3.112-3
ii  libblkid1                 2.33.1-0.1
ii  libc6                     2.30-4
ii  libdevmapper-event1.02.1  2:1.02.171-3
ii  libdevmapper1.02.1        2:1.02.171-3
ii  libreadline5              5.2+dfsg-3+b13
ii  libselinux1               3.1-2
ii  libsystemd0               246.4-1
ii  libudev1                  241-7~deb10u4
ii  lsb-base                  10.2019051400

Versions of packages lvm2 recommends:
ii  thin-provisioning-tools  0.7.6-2.1

lvm2 suggests no packages.

-- Configuration Files:
/etc/lvm/lvmlocal.conf changed [not included]

-- debconf information excluded

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