I've restored my system to a working state by building lvm2 from
upstream source that includes the referenced patch and using the
compiled lvm to do a config backup which added the missing metadata
attributes then using native lvm (lvm2 2.02.133-1ubuntu7) to restore the
config backup.
All is working now using lvm2 2.02.133-1ubuntu7 package.
guy@mediaserver:~/tools$ sudo lvs
LV lv_cache has invalid cache's feature flag.
LV lv_cache is missing cache policy name.
Internal error: LV segments corrupted in lv_cache.
guy@mediaserver:~/tools$ sudo ./lvm vgcfgbackup -v
Using volume group(s) on command line.
Cache is missing cache policy, using mq.
Cache is missing cache mode, using writethrough.
Creating volume group backup "/etc/lvm/backup/vg1" (seqno 13).
Volume group "vg1" successfully backed up.
guy@mediaserver:~/tools$ sudo vgcfgrestore vg1
Restored volume group vg1
guy@mediaserver:~/tools$ sudo lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log
Cpy%Sync Convert
media vg1 Cwi---C--- 500.00g [lv_cache] [media_corig]
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https://bugs.launchpad.net/bugs/1556602
Title:
LVM in 16.04 cannot mount LVM Cached Volumes created in 15.10
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