On Thu, Apr 26, 2001 at 06:26:44PM +0200, Holger Kiehl wrote:
>
>
> On Thu, 26 Apr 2001, root wrote:
>
> >
> > OK, a stupid follow-up question: if I start with 3 drives in a RAID5, I
> > will have 2 data drives and 1 parity drive, correct? Now, if I add 3 more
> > drives as a second logical volume, will I have to devote 1 of them to
> > parity again, or can the initial parity drive be used for both? I would
> > like reserve as many of the drives for data as possible, even if it means
> > spending more money in the near term to get all 6 drives.
> >
> In raid 4 you have a parity disk, in raid 5 the parity is stripped across
> all disks.
true. anyway for disk waste it is the same you always have N-1 in a raid5
if you add a second logical volume (=raid array) it is a different array
so it needs a different parity. you can anyway extend the current raid5
(at least with AMI -i tried hp netraids 1 & 3).
> >
> > Thanks for all the help. Basic real-world questions like this don't tend
> > to make it into faqs, but can go a long way to helping you make informed
> > buying decisions.
> >
> Why not try software raid? Its faster and cheaper.
yup, but with hw raid you save cpu cycles and, more important you
have a battery backup.
L.
--
Luca Berra -- [EMAIL PROTECTED]
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