[linux-lvm] Check of pool ernie/cache failed (status:1). Manual repair required!

[Dennis Schridde]

Hello!

In case the question comes up: Fedora 28 (the live system I am trying to use 
for recovery) is using Linux 4.16.3-301.fc28 and `lvm version`:
LVM version 2.02.177(2)
Library version 1.02.146
Driver version 4.37.0

The system I was originally using to break the cache was using Linux 4.16.7-
gentoo, and `LD_LIBRARY_PATH=$PWD/lib64 ./bin/lvm version` from its initrd 
reports (running on the Fedora 28 live system):
LVM version: 2.02.173(2)
Library version: 1.02.142
Driver version: 4.37.0

Could someone please give me a hint what is actually broken here?  Is it just 
the metadata?  If so, how can that break -- shouldn't that metadata never be 
modified after creating the LV?  And could it not be recovered from /etc/lvm/
archive?  What does "manual repair" mean in detail?  Is there some way to 
recover the cache?  Or is it at least possible to uncache the LV forcibly, to 
hopefully recover the data on the origin LV?  What is your recommendation to 
minimise data loss?

Best regards,
Dennis
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