RobH added a comment.

Well, we have @Mark's approval to use the on-site spares for this (as we have 
plenty.)

Now the only question is how best to implement.

We could do as @Joe suggests and add the two additional disks as raid1 and 
extend the LVM onto them.

Ideally, we setup future installs to be raid10 across all 4 disks.  If we 
cannot afford any reimage time now, we can still do that.  As @fgiunchedi 
points out, we'll want to ensure partman is updated so when reinstall does roll 
around, its not broken.

@Smalyshev: If we can afford the downtime, I think its better longterm to 
reimage them with raid10 and a new lvm.  If we cannot afford the downtime, then 
we can do as @joe suggests and simply raid1 add the new disks and extend the 
LVM.

Please advise (both @smalyshev and anyone else with knowledge on the subject)

I'll create a sub-task to pull and add the additional disks, but with a note 
not to install them without checking first.  (Seating them shouldn't cause any 
issues, but we should be certain and actively monitoring the system during 
this.)


TASK DETAIL
  https://phabricator.wikimedia.org/T119579

EMAIL PREFERENCES
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To: RobH
Cc: RobH, mark, fgiunchedi, hoo, Aklapper, Joe, StudiesWorld, Smalyshev, 
jkroll, Wikidata-bugs, Jdouglas, aude, Deskana, Manybubbles, Mbch331



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