ASM Doubt

[hannah00]

Hi all,

I have been reading about ASM new features in 10G and have some questions:

basically, the whole purpose of ASM is Stripping, mirroring, Online storage Reconfiguration and dynamic rebalancing, managed file creation and deletion.

the question is: if you already RAID array on your DISKs, so why do you need to implement ASM???? what's the pros and cons???

thanks so much

[pando]

Does your RAID do dynamic rebalance? No

Does your RAID manage your datafiles automatically? No

[tamilselvan]

Does your RAID do dynamic rebalance? No

Does your RAID manage your datafiles automatically? No

I have seen dynamic IO load balance on EMC DMX.

What level of automatic management do you expect from RAID?

Tamil

[hannah00]

Let's say if the company only had 2 RAID array (RAID 1 for controlfile, redo and temp, system and RAID 5 for all datafile). How ASM will be applicable to this scenarios????

Do I still be able to set up DISK group 1 with all the Physical DISK (1 to 5)vaiable on the server???? and disk group 2 would be (6 to 10) and let RAID array controller do its owns things ????

I am a bit confused here.