[dm-devel] fixing mangled UUIDs

[John Stoffel]

Alasdair> Have you tried '--manglename none' if you aren't using a
Alasdair> udev system that mangles names?  (Also available via
Alasdair> environmnet variable - see man page.)

That seems to be working, using the default Debbian Jessie lvm tools:

  dmsetup --manglename none status --target cache
  data-home: 0 1153433600 cache 8 2443/32768 128 54020/819200 80721
  350897 64427 66938 0 23882 1 1 writeback 2 migration_threshold 2048
  smq 0 rw -
  data-local: 0 702545920 cache 8 2443/32768 128 1078/819200 6268 85795
  1492 2715 0 1057 0 1 writeback 2 migration_threshold 2048 smq 0 rw -


So now I can try to monitor my cache usage.

So the question still remains, what is the long term fix so I don't
have to deal with this breakage by default?  Do I have bad UUIDS on my
volumes?

John