Public bug reported:
Hi,
I added an SSD drive and convert my LVs to cached LVs :
# pvs
PV VG Fmt Attr PSize PFree
/dev/sda6 vg_acer lvm2 a-- 90,00g 6,00g <= rotational drive
/dev/sda7 lvm2 --- 9,46g 9,46g
/dev/sdb vg_acer lvm2 a-- 29,50g 4,95g <= SSD drive
# lvs
LV VG Attr LSize Pool Origin Data%
Meta% Move Log Cpy%Sync Convert
lv_docker vg_acer Cwi-aoC--- 7,00g [cache_docker] [lv_docker_corig] 100,00
6,35 0,00
lv_home vg_acer Cwi-aoC--- 60,00g [cache_home] [lv_home_corig] 11,06
19,24 0,03
lv_root vg_acer Cwi-aoC--- 14,00g [cache_root] [lv_root_corig] 100,00
9,73 0,00
lv_swap vg_acer -wi-ao---- 3,00g
# mount | grep mapper
/dev/mapper/vg_acer-lv_root on / type ext4
(rw,relatime,errors=remount-ro,data=ordered)
/dev/mapper/vg_acer-lv_home on /home type ext4 (rw,relatime,data=ordered)
/dev/mapper/vg_acer-lv_docker on /var/lib/docker type ext4
(rw,relatime,data=ordered)
The problem is : after each boot, the system does a full resync of the
lv_root LV :
# lvs
-o+cache_dirty_blocks,cache_read_hits,cache_read_misses,cache_write_hits,cache_write_misses
LV VG Attr LSize Pool Origin Data%
Meta% Move Log Cpy%Sync Convert CacheDirtyBlocks CacheReadHits
CacheReadMisses CacheWriteHits CacheWriteMisses
lv_docker vg_acer Cwi-aoC--- 7,00g [cache_docker] [lv_docker_corig] 100,00
6,35 0,19 78 605182
1144143 200214 516198
lv_home vg_acer Cwi-aoC--- 60,00g [cache_home] [lv_home_corig] 11,05
19,24 0,12 34 334339
238365 656695 352970
lv_root vg_acer Cwi-aoC--- 14,00g [cache_root] [lv_root_corig] 100,00
9,73 90,38 88844 32320
44223 1508 2924
lv_swap vg_acer -wi-ao---- 3,00g
The problem only occurs on lv_root, which is the root filesystem. lv_home and
lv_docker seem to be OK after boot.
I guess this might be related to this message I get on shutdown :
Systemd-shutdown: Failed to finalize DM devices, ignoring.
# uname -r
4.4.0-21-generic
# lvm version
LVM version: 2.02.133(2) (2015-10-30)
Library version: 1.02.110 (2015-10-30)
Driver version: 4.34.0
# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04 LTS
Release: 16.04
Codename: xenial
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lvm2 2.02.133-1ubuntu10
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: GNOME-Flashback:Unity
Date: Sun May 1 19:19:54 2016
SourcePackage: lvm2
UpgradeStatus: Upgraded to xenial on 2016-04-24 (6 days ago)
** Affects: lvm2 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug xenial
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https://bugs.launchpad.net/bugs/1577206
Title:
root on dm-cache : always do full resync after reboot
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