On Tue, 2001-12-18 at 07:50, [EMAIL PROTECTED] wrote:
> Sorry do correct you Ed, but
>
> RAID 5 is not striping + mirroring, it is stripping with distributed
> parity,
If I said RAID 5 is striping + mirroring, then you're right - I was
wrong.
> It is the best compromise when you need fault tolerance, it`s cheaper
> then
> RAID 1 (mirroring) and the fault tolerance is also ok !
I have a lot of RAID 5 storage at work. In fact, I use controller-based
RAID 5 (on redundant controllers) and then use hosts in separate data
centers to mirror the storage. This gives me fault tolerance as well as
disaster tolerance.
> You forgot RAID 4 it is stripping with parity on one Disc ! It s
> normally not used any longer as i know !
Ditto for RAID 3. There are bunch of other obscure RAID
implementations, although most are not officially recognized by the RAB
(Raid Advisory Board) but made up in vendors' mind and sold like a
standard. RAID 7 and RAID S are among these.
Cheers,
.../Ed
--
Ed Wilts, Mounds View, MN, USA
mailto:[EMAIL PROTECTED]
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