LVM caching enabled in Ubuntu 16.04 (or, to be completely honest, Linux Mint 18) is also incompatible with the older caching implementation in Linux Mint Debian Edition 2 (i.e. Debian Jessie). I hoped the following procedure would create an LVM cache that works for both Jessie and Xenial:
1) Under Jessie, remove the cache from the LVM volume. 2) Reboot into Xenial and add an LVM cache to the volume. (This works fine). 3) Reboot back to Jessie to use the LVM volume with caching created under Xenial. My goal is to support dual boot between jessie and xenial with LVM caching enabled on my data volumes. This doesn't work. The LVM volume comes up a disabled or offline under Jessie and there's no apparent way to bring it up without removing the cache. (I can easily recreate this on my scratch/test machine in case there's useful data to be gathered). So, LVM caching between debian jessie and ubuntu xenial is neither forward or backwards compatible. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to lvm2 in Ubuntu. https://bugs.launchpad.net/bugs/1556602 Title: LVM in 16.04 cannot mount LVM Cached Volumes created in 15.10 Status in lvm2 package in Ubuntu: Confirmed Bug description: I'm test driving Ubuntu Mate Beta 1 (from USB) on a machine that uses LVM caching. (I use some SSD to cache old hard drives). My LVM setup was created with Linux Mint Debian Edition - Betsy release. The system cannot mount these cached volumes due to the following error reported by 'pvs': ubuntu-mate@ubuntu-mate:~$ sudo pvs LV CacheArchive has invalid cache's feature flag. LV CacheArchive is missing cache policy name. Internal error: LV segments corrupted in CacheArchive. LV CacheArchive has invalid cache's feature flag. LV CacheArchive is missing cache policy name. Internal error: LV segments corrupted in CacheArchive. PV VG Fmt Attr PSize PFree /dev/sda5 vga lvm2 a-- 80.00g 70.00g /dev/sda6 vga lvm2 a-- 160.00g 50.00g /dev/sdb1 vga lvm2 a-- 200.00g 50.00g I did a bit of googling and found a similar report for upgrades from Fedora 21 to Fedora 23. See https://bugzilla.redhat.com/show_bug.cgi?id=1282188. I'll annotate this bug with the LVM version from my existing Debian based configuration in a few minutes. This is a show-stopper for me because I use LVM caching on both of my PCs. It's a great way to marry a 256 GB SSD with a 2 TB hard drive. I keep the OS and some key partitions on the SSD and then use the rest of the SSD to cache the hard drive. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: lvm2 2.02.133-1ubuntu7 ProcVersionSignature: Ubuntu 4.4.0-7.22-generic 4.4.2 Uname: Linux 4.4.0-7-generic x86_64 ApportVersion: 2.20-0ubuntu3 Architecture: amd64 CasperVersion: 1.367 CurrentDesktop: MATE Date: Sun Mar 13 12:48:41 2016 LiveMediaBuild: Ubuntu-MATE 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160224) ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: lvm2 UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lvm2/+bug/1556602/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
