| From: | Manuel Sugawara <masm(at)fciencias(dot)unam(dot)mx> |
|---|---|
| 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: | 2002-05-26 20:31:17 |
| Message-ID: | m3g00er7v4.fsf@conexa.fciencias.unam.mx |
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| Lists: | pgsql-admin |
Peter Eisentraut <peter_e(at)gmx(dot)net> writes:
> There are also other levels. One poster talked about RAID 10 which
> appears to be a mirrored RAID 5.
Those are multi-level RAID systems:
- RAID (0+1) RAID 1 (high availability) plus RAID 0 (enhaced I/O
performace through striping).
- RAID (3+0) A logical volume with several RAID 3 logical member
drives.
-RAID (5+0) A logical volume with several RAID 3 logical member
drives.
-RAID (5+1) Requires multiple RAID controllers. Each layer-1 RAID
controller handles one RAID 5 logical drive and layer-2 RAID
controller performs RAID 1 (mirroring) function to the virtual disks
controlled by all of the layer-1 RAID controllers.
- RAID (5+5) Requires multiple RAID controllers. Each layer-1 RAID
controller handles one to several RAID 5 logical drives and layer-2
RAID controller performs RAID 5 to the virtual disks controlled by all
of the layer-1 RAID controllers.
- RAID 10 Logical volume with RAID 1 logical drives; stripping plus
mirroring.
- RAID 30 Logical volume with RAID 3 logical drives; RAID 3 plus
striping.
- RAID 50 Logical volume with RAID 5 logical drives; RAID 3 plus
striping.
All about RAID: "The RAID book" from the RAID Advisory Board.
Regards,
Manuel.
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