FTR, on Archlinux this option is also not used, however the `--type
writecache` works fine. So either something changed in later versions,
or it might be that some other `configure` option is needed. The
Archlinux `lvm version` output is:
λ lvm version
LVM version: 2.03.12(2) (2021-05-07)
Library version: 1.02.177 (2021-05-07)
/dev/mapper: mkdir failed: Permission denied
Failure to communicate with kernel device-mapper driver.
Incompatible libdevmapper 1.02.177 (2021-05-07) and kernel driver (unknown
version).
Configuration: ./configure CONFIG_SHELL=/bin/bash --prefix=/usr
--sbindir=/usr/bin --sysconfdir=/etc --localstatedir=/var --enable-cmdlib
--enable-dmeventd --enable-lvmpolld --enable-pkgconfig --enable-readline
--enable-udev_rules --enable-udev_sync --with-cache=internal
--with-default-dm-run-dir=/run --with-default-locking-dir=/run/lock/lvm
--with-default-pid-dir=/run --with-default-run-dir=/run/lvm
--with-systemdsystemunitdir=/usr/lib/systemd/system --with-thin=internal
--with-udev-prefix=/usr --enable-udev-systemd-background-jobs
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https://bugs.launchpad.net/bugs/1868129
Title:
I can't attach a writecache to LV
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