Redo Log Files And Raid5

[rysiekmus]

Can anybody tell me
Why it is not recommended not to put Redo Log Files on RAID5?

Thanx in Advance

Hi ,

the main reason is that if you get a redolog corrupt, the mirrored redolog will also be corrupt. If you set up a mirrored "by Oracle" (another phisical drive) set of redologs and one file in a set becomes corrupt, Oracle will not crash but will continue to work with the other set of redo logs until you fix the problem. Otherwise - when one redolog is corrupt, the mirrored by the operating system is corrupt as well and this could lead you to having the database crashing.

The problem these days is that - like in my work I get a Windows server with all drives initially mirrored (typically only C: and D: ) and it's hard to follow Oracle recommendations.

O hope this helps,

Regards,
Richard.