> > It really is up to the final customer. I prefer raid 5 over
> mirroring
> >for maximum up time in the commercial products I've seen.
>
>
> I have to agree here. 0+1 is a cheaper and faster solution but when it
> comes to stability RAID 5 is the biz. We've had a number of crashes
> (which proved to be a bad channel on our RAID controller in the end) and
> with hot-swap and RAID 5 we never needed to take down the system until
> we had to replace the controller.
RAID 0+1 (striping+mirroring) requite 2N drives for N drives worth of
data, while RAID 5 requires only N+1 drives for N drives worth of
fata.
RAID 0+1 is a faster but *more expensive*. It generally works using
exactly the same controller and hot-swap support as RAID 5, except
that you need more drives for the same amount of net storage. 0+1 is
also more reliable in the sense that more than one drive can fail
(as long as they are not a mirrored pair) without losing data or
uptime.
Here are sites with RAID level information:
http://www.clariion.com/products/raid_levels.html
http://www.psidisk.com/shortRAID.html
[* kyle@stripped | For Delphi | BDE Alternatives Guide *]
[* http://www.kylecordes.com | developers: | MIDAS Alternatives Guide *]
