| From: | Ragnar Kjørstad <postgres(at)ragnark(dot)vestdata(dot)no> |
|---|---|
| To: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-admin <pgsql-admin(at)postgresql(dot)org> |
| Subject: | Re: databases and RAID ... |
| Date: | 2002-05-25 19:38:39 |
| Message-ID: | 20020525213839.A24769@vestdata.no |
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| Lists: | pgsql-admin |
On Sat, May 25, 2002 at 09:29:01PM +0200, Peter Eisentraut wrote:
> 0 Nonredundant
> 1 Mirrored
> 2 Memory-style ECC
> 3 Bit-interleaved parity
> 4 Block-interleaved parity
> 5 Block-interleaved distributed parity
> [Hennessy & Patterson]
>
> There are also other levels. One poster talked about RAID 10 which
> appears to be a mirrored RAID 5.
No, RAID 10 is RAID 1 over RAID 0 (mirrored stripes). Mirrored RAID 5
would RAID 1 over RAID 5 or RAID 15 for short.
--
Ragnar Kjorstad
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