University of Cambridge Computer Laboratory - Status Page

Following on from the earlier unscheduled VM storage outage, we need to replace a failed memory module in the storage server that backs one of our departmental VM pools in order to restore performance and reliablity.

This requires us to shut down all VMs on xene-pool1, which will affect the following departmental services:

• cl-student-ssh - Undergraduate SSH server

• MSA (partial outage, one of two servers affected)

• Request Tracker

• VPN2 (partial outage, one of two servers affected and new connections are already steered towards the other server)

• Departmental database server (SQL Server / svr-win-db / db-*)

• Windows Remote Desktop service

• dbwebserver

• WSUS (Windows Updates)

And it will affect the following user VMs:

• cl-teaching-ecad

• dev-compilers0

• egress

• knot

• lmserv-mentor

• svr-papers

• svr-www-ecad

• svr-yg386-web

These will be shut down soon after 5pm and will remain off for approximately an hour. The at-risk window is given as 2.5 hours due to uncertainty with the exact timing.

We will take the opportunity to do some routine maintenance (software and firmware updates) of the storage system at the same time, in order to avoid a future need to do more scheduled maintenance.