12c New ASM Features

– Oracle Flex ASM
– ASM Disk Failure Handling Enhancements
– Failure Group Repair Time
– ASM Data Allocation Enhancement
– Extent Reading Selection Enhancement

– ASM Disk Failure Handling Enhancements

Management associated with mirror synchronization in normal and high redundancy Disk Groups.

Simply replace an offline disk using one fast and efficient operation. Using this feature, the replacement disk is populated with mirror copies of the ASM extents from other disks, and there is no need for any additional reorganization or rebalancing across the rest of the unaffected Disk Group.

Priority ordered rebalance is provided

Protection against hidden corruption for non-accessed data is a new feature for Oracle Database 12c. Proactive scrubbing checks for, and where possible, repairs corruptions detected. On-demand scrubbing can be performed on a Disk Group, on individual files or individual disks.

– Failure Group Repair Time
A larger repair time value ensures that all the disks are not dropped automatically in the event of a short term and recoverable Failure Group outage. Consequently, ASM in Oracle Database 12c provides for a new Disk Group attribute called failgroup_repair_time that defaults to 24 hours.

– ASM Data Allocation Enhancement

– Extent Reading Selection Enhancement
The Even Read feature of Oracle Database 12c ASM, evenly distributes the selection of which copy of a block is read. With Even Read enabled, each read request is sent to the least loaded of the available disks.

reference :
http://asmsupportguy.blogspot.sg/2013/08/asm-version-12c-is-out.html
A Technical Overview of New Features for Automatic Storage Management in Oracle Database 12c – Oracle WhitePaper

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