University of Cambridge Computer Laboratory - GPU cluster storage maintenance – Maintenance details

This maintenance has been completed. Personal VMs can be started via Xen Orchestra (https://xo.cl.cam.ac.uk/) as needed.

The outage has overrun due to a problem encountered during the storage server's RAM upgrade. Progress is being made; we can still upgrade the RAM and restore service, just not in the way we expected to. Current estimate for restoration of service: 19:00-19:15.

This work is ongoing and is likely to overrun due to an unexpected hardware problem.

The server that hosts storage for the departmental GPU cluster needs an urgent security update, and a reboot.

This will necessitate shutting down all GPU and CPU development VMs, dev-gpu-* and dev-cpu-1, including the shared servers dev-gpu-1 and dev-cpu-1. These VMs' disks, as well as associated data directories (GPU home directories and shared "gpuscratch" space), will be unavailable for about half an hour. As it will take time to shut down and restart the VM infrastructure, VMs will be unavailable for longer: approximately an hour.

We will take the opportunity to add RAM to the storage server too, to improve performance.