Re: RAID vs Redo log mirroring

Hi:

I don't believe the Oracle instance will allow you to have less than two redo log members. This is for your own good. Redo logs, even if on RAID5, RAID1, or RAID6 can become "stale" (that is, have a write error). The Oracle instance knows when this happens, and will simply use the redo log from the other member for archiving or recovery.

Good luck,
Dave

Robin Bishop wrote in message
<01bd993e$3cf8c3c0$4baa3ec1_at_regan.bton.ac.uk>...
>Given that the primary (only?) reason for mirrored redo logs is to guard
>against media failure, can anyone suggest whether it is still necessary on
>a system running RAID level 5?
>
>Is there a circumstance whereby mirroring would provide some security that
>RAID would not? My feeling is that relying on RAID should be sufficient but
>I'm pretty new to this game. All the DBA stuff I've read suggests that
>mirroring redo logs is very nearly essential but none of it mentions the
>impact of RAID systems on this view.
>
>Thanks in advance for your opinions.
>--
>Robin Bishop
>University of Brighton Computer Centre
>Brighton, England
Received on Wed Jun 17 1998 - 19:37:09 CDT