Re: RAID vs Redo log mirroring

You do
"rm *"
then discover you are in the wrong directory.

RAID 5 will faithfully save all actions to disk, including stupid ones. Having mirrored logs is like copying an important file to another directory every once in a while. Not absolutely necessary, but if you ever need it, you'll REALLY need it.

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 - 09:40:57 CDT