After checking out Nagios to see how office1 was doing, I noticed that none of the cairo nodes were reachable, so I went down and attempted to fix it with Toby, with some help from Charlie
Nagios was reporting that Cluster-SW0 was down; none of the switches in the Cairo rack were labelled, so I power cycled all 3. That didn't do anything. I know very little about the clusters beyond their names, so I got Charlie. We tried hopperprime and thought maybe a dead NIC in there, then we speculated that the Cluster-SW0 was bad, but we came to the conclusion that c0 just needed to be power cycled. Seemed to do the trick, for now.
We've added the DHCP entries from hopper for athena and bazaar to quark's dhcpd.conf. I restarted dhcrelay on a0 and b0 to point to quark rather than hopper.
Hassan and I reinstalled the OS on c8. All appears to be well, for now.