Even if place on RAID1 arrays, the redo logs should still be mirrored at the
Oracle level. If the log writer process determines that it does not know
whether the contents of a particular redo log are valid, it will mark that
redo log as "STALE" in the v$log table. If this redo log is the only copy,
then it cannot be archvied, (assuming in archive log mode) and will cause a
database halt.
Steven Hauser <hause011_at_garnet.tc.umn.edu> wrote in message
news:84u3sc$e3m$1_at_garnet.tc.umn.edu...
> What reason would you multiplex the redo log if you had
> hardware mirrors of the disks?
>
> The only reason given in the manuals is if a redo file is
> lost due to disk failure.
>
> Hardware mirrors seem more reliable than additional Oracle
> mirroring 'multiplexing' and maybe faster without
> oracle mirroring.
>
> --
> ---------------------------------------------------------
> Steven Hauser
> email: hause011@tc.umn.edu URL: http://www.tc.umn.edu/~hause011
> ---------------------------------------------------------
Received on Wed Jan 05 2000 - 23:55:15 CST
