3 Replies Latest reply: May 10, 2012 7:29 AM by 934646 RSS

    Re:ASM disks

      Hi everyone!!

      I just want to migrate the data from 2003 server(10gR2) to 2008 server(11gR2) windows and the 2003 server has no ASM and 2008 server has ASM. I have five drives in 2003 eg: C,D,E,F,G and each drive contains specific task for example C drive contains ORALCE_HOME, D containd datafiles, H contains Backup etc..

      My question is : Is it possible to configure ASM similar kind of disks as in 2008 (ofcourse with simalar size) and import the data as it is ( I mean c drive data in one disk,d drive data in another disk in the 2008 server etc..)

      I think it is not possible as ASM manages the storage, but i just want to confirm that.

      Thanks in advance..
        • 1. Re:ASM disks
          Balazs Papp
          yes its possible by creating mutliple diskgroups
          • 2. Re:ASM disks
            Why would you want to store the ORACLE_HOME in ASM?

            Using ASM in this fashion means defining a file system in ASM that can be used via a file system driver (just like a NTFS or FAT32 file system). This is typically done in ASM on clusters for creating a shared cluster file system (called ACFS), where each server in the cluster can see the same file system and same files - and access and use the file system at the same time.

            As for backups - if you use ASM then you do not need a file system. RMAN can backup directly to an ASM diskgroup.

            There are also performance considerations. ASM automatically stripes a diskgroup's data across all disks in that group. If you define a diskgroup per physical drive, you will not gain any striping performance. If you have 2 physical disks in a diskgroup, there will now be 2 sets of disk controllers for reading and writing, thanks to striping. If there are 3 disks in the diskgroup, then 3 sets of disk controllers. This approach scales I/O performance.

            ASM also support 2 and 3 way mirroring (or no mirroring if no redundancy in ASM need to be configured).

            So if you expect to see improved I/O performance, and better and more flexible management of the storage layer, you need to look at what ASM provides and how this can be leveraged in your environment. Not look at how you can force your storage into ASM, to look exactly as the storage did prior to using ASM.

            If your aim is to make the storage in ASM look exactly the same as your current layout - why then even bother using ASM?
            • 3. Re:ASM disks
              Hi Bily Verreynne!!

              Thanks for the reply..That`s what i told to my manager, but he is not able to understand. Any ways thank you very much.