Originally posted by blguy

Q. How would I configure them? My thoughts are:

Three sets of mirrored drives. Each mirror contains a log member.

i.e.
Drive 1 - REDO1A
Drive 2 - REDO1B

Drive 3 - REDO2A
Drive 4 - REDO2B

Drive 5 - REDO3A
Drive 6 - REDO3B

and then Drive 1 & 2 would contain REDO4A/B, drive 3 & 4 REDO05A/B and drive 5 & 6 REDO06A/B to give 6 members - each 256MB in size to keep the 15 minute switch rate.

I don't see the point of spreading on three sets of drives. LGWR will write to one pair (on seperate controllers, right?). Then ARCH will read the logfile and send to log_archive_dest_n and/or standby while LGWR is working on another pair. Since the ARCH process is so quick (most likely), the time spent reading of the log that was just switched is minimal. Eight disks would be ideal. You could setup two 0+1 filesystems and write one member to each filesystem (as long as you're using hardware RAID).

For what it's worth, I think you're masking your real problem with hardware.