Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: lvm2 (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1874641

Title:
  Can't create writecache LV

Status in lvm2 package in Ubuntu:
  Confirmed

Bug description:
  #lvconvert --type writecache --cachesettings 'low_watermark=0 
high_watermark=10 writeback_jobs=2048' --cachevol cache ssd
    WARNING: Unrecognised segment type writecache
    Invalid argument for --type: writecache
    Error during parsing of command line.

  lvm2 package was build without key --with-writecache=internal

  #lvm version
    LVM version:     2.03.07(2) (2019-11-30)
    Library version: 1.02.167 (2019-11-30)
    Driver version:  4.41.0
    Configuration:   ./configure --build=x86_64-linux-gnu --prefix=/usr 
--includedir=${prefix}/include --mandir=${prefix}/share/man 
--infodir=${prefix}/share/info --sysconfdir=/etc --localstatedir=/var 
--disable-silent-rules --libdir=${prefix}/lib/x86_64-linux-gnu 
--libexecdir=${prefix}/lib/x86_64-linux-gnu --runstatedir=/run 
--disable-maintainer-mode --disable-dependency-tracking --exec-prefix= 
--bindir=/bin --libdir=/lib/x86_64-linux-gnu --sbindir=/sbin 
--with-usrlibdir=/usr/lib/x86_64-linux-gnu --with-optimisation=-O2 
--with-cache=internal --with-device-uid=0 --with-device-gid=6 
--with-device-mode=0660 --with-default-pid-dir=/run 
--with-default-run-dir=/run/lvm --with-default-locking-dir=/run/lock/lvm 
--with-thin=internal --with-thin-check=/usr/sbin/thin_check 
--with-thin-dump=/usr/sbin/thin_dump --with-thin-repair=/usr/sbin/thin_repair 
--enable-applib --enable-blkid_wiping --enable-cmdlib --enable-dmeventd 
--enable-dbus-service --enable-lvmlockd-dlm --enable-lvmlockd-sanlock 
--enable-lvmpolld --enable-notify-dbus --enable-pkgconfig --enable-readline 
--enable-udev_rules --enable-udev_sync

  #lsmod | grep dm_writecache
  dm_writecache          36864  0

  #lsb_release -rd
  Description:  Ubuntu 20.04 LTS
  Release:      20.04

  #apt-cache policy lvm2
  lvm2:
    Installed: 2.03.07-1ubuntu1
    Candidate: 2.03.07-1ubuntu1
    Version table:
   *** 2.03.07-1ubuntu1 500
          500 http://ua.archive.ubuntu.com/ubuntu focal/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: lvm2 2.03.07-1ubuntu1
  ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
  Uname: Linux 5.4.0-26-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: pass
  Date: Fri Apr 24 07:48:49 2020
  InstallationDate: Installed on 2020-04-23 (0 days ago)
  InstallationMedia: Ubuntu-Server 20.04 LTS "Focal Fossa" - Release amd64 
(20200423)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: lvm2
  UpgradeStatus: No upgrade log present (probably fresh install)

  
  # lvs
    LV    VG  Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync 
Convert
    cache ssd -wi-a-----  <5.00g                                                
    
    data  ssd -wi-a----- <10.00g

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