Redo Logs setup
- From: "VIVEK_SHARMA" <VIVEK_SHARMA@xxxxxxxxxxx>
- To: "LazyDBA.com Discussion" <oracledba@xxxxxxxxxxx>,<oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 24 May 2004 12:46:15 +0530
Configuration setup (XP1024)
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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Hardware RAID (1+0) on 4 underlying Disks.
4 Units of 14 GB each are created using a Software emulation (OPEN-E,
OPEN-9) on this underlying Hardware RAID (Each Unit is known as Logical
Device [LDEV])
Each LDEV is assigned to a different Controller port.
Volume Group [VG] created EITHER from a SINLE LDEV OR by O.S. Software
Striping (RAID 0) across 4 LDEVs.
Qs. For Redo Logs placing, which of the following 2 options is better?
1) Redo logs if placed on a Single LDEV-VG will have only a single level
of Hardware RAID 1+0 & be assigned to a SINLE Controller port.=20
2) Redo logs if placed on a 4 LDEV's-VG will have 2 levels Striping
(Both s/w & H/w) But also be assigned to 4 Controller ports.
NOTE - Ideally Redo logfiles should exist on RAW or NON-Striped, Mirror
Volume.
Shall provide any details required
Thanks
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