Upgrading oyster.

1. Pacify nagios for oyster.
2. Pacify nagios for its MPU guests too.
3. Migrate essential VMs elsewhere.
4. Stop oyster's VMs from suspending and resuming at every reboot: !boot.services mREMOVE(rc_libvirtguests)
5. Shut down every VM in rvirsh oyster list :

          kvmtool shutdown --name rembrandt
          kvmtool shutdown --name nimrodkvm
          kvmtool shutdown --name tetrakvm
          kvmtool shutdown --name praecox
          kvmtool shutdown --name knox
          kvmtool shutdown --name sanremo
          kvmtool shutdown --name tench
          kvmtool shutdown --name nescxldb
          kvmtool shutdown --name barb
          kvmtool shutdown --name tarnkvm
          kvmtool shutdown --name natter
          kvmtool shutdown --name charlar
          kvmtool shutdown --name canary
          kvmtool shutdown --name redmires
          kvmtool shutdown --name yubtest
          kvmtool shutdown --name dstwo
          kvmtool shutdown --name dsone
          kvmtool shutdown --name guppy
          kvmtool shutdown --name bakerstreet
          kvmtool shutdown --name huxley
          kvmtool shutdown --name dunkvm
          kvmtool shutdown --name banter
          kvmtool shutdown --name craic
          kvmtool shutdown --name lardup
          kvmtool shutdown --name gabble
          kvmtool shutdown --name heda
          kvmtool shutdown --name rhacotis
          kvmtool shutdown --name arachne
          kvmtool shutdown --name storck
   

6. Check rvirsh oyster list to make sure they're all down.
7. Check that /var/lib/libvirt/qemu is empty (apart from 3 empty directories).
8. rfe lcfg/oyster and remove DICE_STICK_WITH_SL65
9. Wait for the new profile to hit oyster and check /var/lcfg/log/client etc.
10. Install any new packages before rebooting, to minimise later reboots: om updaterpms run -- -f
11. Shut oyster down.
12. Install the new memory.
13. Switch oyster on.
14. Ensure that the new memory is recognised and passed by the POST.
15. If possible boot to single user.
16. Get the new partition's UUID: /sbin/blkid /dev/sda4 -o value -s UUID
17. Edit sda4 and its UUID into /var/lcfg/conf/fstab/fstab.sda
18. om fstab configure or edit sda4 and its UUID into /etc/fstab
19. mount -a to check the new partition.
20. Go to multi-user or reboot.
21. Start the VMs: /etc/init.d/libvirt-guests start
22. Or if that doesn't work when VMs aren't running at all, start them up individually:

           kvmtool start --name rembrandt
           kvmtool start --name nimrodkvm
           kvmtool start --name tetrakvm
           kvmtool start --name praecox
           kvmtool start --name knox
           kvmtool start --name sanremo
           kvmtool start --name tench
           kvmtool start --name nescxldb
           kvmtool start --name barb
           kvmtool start --name tarnkvm
           kvmtool start --name natter
           kvmtool start --name charlar
           kvmtool start --name canary
           kvmtool start --name redmires
           kvmtool start --name yubtest
           kvmtool start --name dstwo
           kvmtool start --name dsone
           kvmtool start --name guppy
           kvmtool start --name bakerstreet
           kvmtool start --name huxley
           kvmtool start --name dunkvm
           kvmtool start --name banter
           kvmtool start --name craic
           kvmtool start --name lardup
           kvmtool start --name gabble
           kvmtool start --name heda
           kvmtool start --name rhacotis
           kvmtool start --name arachne
           kvmtool start --name storck
    

23. Remove the oyster details from https://computing.help.inf.ed.ac.uk/scheduled-downtime
24. Migrate the essential VMs back from hammersmith and jubilee.
25. Remove the temporary storage and symlinks from hammersmith and jubilee.