Database Software

This question pertains to ASM using external redundancy

Let us suppose that we have 8 drives to create +DATA disk group

we can either

(a) configure 4 RAID 1 (mirroring) volumes and present these 4 luns to ASM
OR
(b)configure 1 RAID 1+0 volume using all 8 disks and present this single lun to ASM

Can someone please answer the following questions for us?

Q # 1. Is it correct that ASM CANNOT see the underlying PHYSICAL DRIVES of the luns, it only sees the LUNS persented to it?

Q # 2. If we create a 4 MB data file, under scenario (a), ASM will stripe the file into 1 MB extents and put that onto each of the 4 RAID-1 volume. Correct?

Q # 3. If we create a 4 MB data file, under scenario (b),i.e RAID 1+0 volume, since ASM is only aware of a single LUN presented to it, it will not stripe the 4 MB file and will put it on the RAID 1+0. Since this is a hardware RAID 1+0, the data will be striped and mirrored automatically (but not necessarily in 1 MB stripe size but rather the stripe size defined at the time of RAID 1+0 volume creation. Correct?


Thanks