Comment # 20 on bug 997637 from Neil Rickert

Here's requested output (requested in comment 19):

After a successful boot:

 ----
# systemctl status lvm2-lvmetad.service
��� lvm2-lvmetad.service - LVM2 metadata daemon
   Loaded: loaded (/usr/lib/systemd/system/lvm2-lvmetad.service; disabled;
vendor preset: disabled)
   Active: active (running) since Wed 2016-09-28 09:03:49 CDT; 1min 48s ago
     Docs: man:lvmetad(8)
 Main PID: 1196 (lvmetad)
    Tasks: 1 (limit: 512)
   CGroup: /system.slice/lvm2-lvmetad.service
           ������1196 /sbin/lvmetad -f

Sep 28 09:03:49 nwr8 systemd[1]: Started LVM2 metadata daemon.

# systemctl status lvm2-pvscan@pv_major:pv_minor.service
��� lvm2-pvscan@pv_major:pv_minor.service - LVM2 PV scan on device
pv_major:pv_minor
   Loaded: loaded (/usr/lib/systemd/system/lvm2-pvscan@.service; static; vendor
preset: disabled)
   Active: inactive (dead)
     Docs: man:pvscan(8)

# systemctl status systemd-cryptsetup@home.service
��� systemd-cryptsetup@home.service
   Loaded: not-found (Reason: No such file or directory)
   Active: inactive (dead)

# systemctl status systemd-cryptsetup@xhome.service
��� systemd-cryptsetup@xhome.service
   Loaded: not-found (Reason: No such file or directory)
   Active: inactive (dead)
 ----
I repeated that last one with "xhome" because I am actually mounting the home
volume at "/xhome" on that system (and I then use symlinks into it from home
directory).  That's to avoid problems with using the same home volume on more
than one system.  I'm not sure that's checking anything, since cryptsetup would
be for the LVM, rather than for the home volume.

After an unsuccessful boot (I ran these from emergency mode before doing
anything else:

 ----
# systemctl status lvm2-lvmetad.service
��� lvm2-lvmetad.service - LVM2 metadata daemon
   Loaded: loaded (/usr/lib/systemd/system/lvm2-lvmetad.service; disabled;
vendor preset: disabled)
   Active: active (running) since Wed 2016-09-28 09:09:56 CDT; 2min 9s ago
     Docs: man:lvmetad(8)
 Main PID: 1142 (lvmetad)
    Tasks: 1 (limit: 512)
   CGroup: /system.slice/lvm2-lvmetad.service
           ������1142 /sbin/lvmetad -f

Sep 28 09:09:56 nwr8 systemd[1]: Started LVM2 metadata daemon.

# systemctl status lvm2-pvscan@pv_majorr:pv_minor.service
��� lvm2-pvscan@pv_majorr:pv_minor.service - LVM2 PV scan on device
pv_majorr:pv_minor
   Loaded: loaded (/usr/lib/systemd/system/lvm2-pvscan@.service; static; vendor
preset: disabled)
   Active: inactive (dead)
     Docs: man:pvscan(8)
 ----

I'll add that I booted 3 times this morning.  The first two boots were
successful.  The third took me to emergency mode with "/xhome" not mounted.  I
mention this as an indicator that the problem is intermittent.