[Pc_Support] RE: RAID options for SATA -- XFX = NetCell RAID-XL

[Bryan J. Smith <b.j.smith at ieee.org>]

From: Damien McKenna <dmckenna at thelimucompany.com>
> I thought with RAID-5's ability to auto-heal

???  Actually, RAID-3 and RAID-4 can "auto-heal" as well.
It's just a matter of reading the data stripe disks + the parity disk
(if it wasn't the parity disk that went, which is just then rebuilt
from the existing data stripe disks).

A rebuild actually might be a little faster with RAID-3/4.

> & span an increased number of disks that it could work different,
> guess not, my mistake.

Actually, RAID-3 and RAID-4 are _more_flexible_ when it comes
to expansion.  Why?  Because you always have *1* fixed parity disk,
regardless of the number of disks.  It's not striped in with data.

But in reality, RAID-3/4/5 all have similar issues in rebuilds and
expansion.


--
Bryan J. Smith   mailto:b.j.smith at ieee.org