[tech] morwong's disks

[James Andrewartha]

Morwong now has 5x 9gig and 1x4 gig disks. Currently, 2 9s and one are in
use, with /home wholly using one of the 9s. This means we have 4x 9gig
disks available for /home. There are several options:

o Software RAID 5 across all 4 disks. Gives 27gig usable space, some
  redundancy, some CPU hit.

o Two RAID 1 sets containing 2 disks each, added to the one domain. Gives
  18gig usable space, good redundancy, little CPU usage (comparatively).

o Two RAID 0 sets containing 2 disks each, added to the one domain. Gives
  36gig usable space, no redundancy, good performance, little CPU usage.

There are two other options similar to the last one, namely one RAID 0 set
containing 4 disks (higher throughput, but it'll block more since AdvFS
only sees the one logical device), or just 4 disks in the domain (lower
throughput, more spindles).

So, what do we want to do? One other thing to note is that the first
option will require deleting /home from morwong and then restoring it from
backup, while the others can be done simply by shuffling volumes around in
home_domain.


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