On 12/23/07, Christopher Chan <[EMAIL PROTECTED]> wrote:
> Patrick Ale wrote:
> > On 12/22/07, Christopher Chan <[EMAIL PROTECTED]> wrote:
> > <snip>
PSU = Power Supply Unit, and you need at least two of them when using
XFS IMO (and according to SGI self).
A UPS is also good but it only helps you against power delivery
issues. It doesn't help against people working in your server racks
and accidently yanking cables or a PSU blowing away.
Battery-backed caches are caches (mostly on RAID controllers) that
will hold the data for an X amount of minutes while the power delivery
is interupted, allowing the disks to sync up.