4.6.15 1700 CST We have found the latency issue to be related to one of several SAN's. We are currently restarting VM's associated with this particular SAN. Some will require a FSCK. 4.6.15 1550 CST We are currently investigating a DoS attack affecting servers on in the 66.180.164 and 216.235.70 subnets.
As of 1930 CST, all but two of the affected VM's were back online.