i routinely specify errors=remount-ro for all mountpoints in fstab.  well
i'm guessing it must've finally actually just happened.  i got a few rsync
command errors like

rsync: mkstemp "/vp/201/var/nagios/spool/checkresults/.checkzXAdNO.u4thPb"
failed: Read-only file system (30)
rsync: mkstemp "/vp/201/var/nagios/spool/checkresults/.checkzfSgt2.TEekFF"
failed: Read-only file system (30)
rsync: mkstemp "/vp/201/var/run/.utmp.rddpv9" failed: Read-only file system
(30)

so i check /proc/mounts and whaddyaknow it's mysteriously become readonly.
but i'm very surprised to find nothing unusual in /var/log/messages.  and
/proc/mdstat is all UU's.

i was just about to migrate containers onto this box.  it was fine last
week.  well heck, better run some tests instead i guess.  but what?  if it
wasn't raid1/lvm, i'd run fsck -c, but as it is raid1/lvm, what should i
bang on it with?
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