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Database Cloud Storage: The Essential Guide to Oracle Automatic Storage Management by Prasad Bagal, Nitin Vengurlekar

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CHAPTER
8
ASM Space Allocation and Rebalance
When a database is created under the constructs of ASM, it will be striped (and can be optionally mirrored) as per the Stripe and Mirror Everything (SAME) methodology. SAME is a concept that makes extensive use of striping and mirroring across large sets of disks to achieve high availability and to provide good performance with minimal tuning. ASM incorporates the SAME methodology. Using this method, ASM evenly distributes and balances input/output (I/O) load across all disks within the disk group. ASM solves one of the shortcomings of the original SAME methodology, because ASM maintains balanced data ...

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