On Dec 28, 2007 9:30 AM, Don Seiler <don@xxxxxxxxx> wrote: > > I'm trying to get detailed specifics on the lay of the storage > landscape beneath ASM. As I've indicated in another thread, we're > currently just using two 933gb LUNs for this disk group. These LUNs > are carved from the SAN and composed of a number of disks under RAID > 10. I'm waiting for the admin to give me info like individual disk > size and stripe size. IIRC, each RAID group is composed of 3 data and > 3 parity disks, the LUNs are then striped across those, and then ASM > is striped across the (two) LUNs in the normal ASM disk group fashion. > > We are using external redundancy in the ASM disk group. > > I'll write back when I get more storage specifics. OK I was able to get these specifics about our RMAN and ASM LUNs: * ASM disks: both are 14 disks, RAID 10, 7D+7P * RMAN: 12 disks, RAID 10, 6D+6P * Disks are each 73G * Stripe size is 64k The D+P means data and parity for mirroring. Re: ASM. It seems to me like we're shooting ourselves in the foot if we give ASM two big striped-and-mirrored LUNs rather than at least letting ASM handle the striping across 7 disks rather than 2. I'd like to know what people's thoughts who've had more experience with such things. Although I digress from the immediate problem of the RMAN post-restore catalog task taking forever. Don. -- Don Seiler http://seilerwerks.wordpress.com ultimate: http://www.mufc.us -- //www.freelists.org/webpage/oracle-l