How ASM manages disk failure

Hello

Would by document Oracle ASM and stumbled on this subject need to shed some light on this please.

"Disks are first taken offline and then automatically deleted. In this case, the disk group remains mounted and fit for service. In addition, due to mirroring, all data from disk is accessible. After the decline of disk, Oracle ASM operation performs a rebalancing to restore full redundancy of data on defective discs".".   -What it means?

Thank you

Redundancy of the DSO is basic ability and not founded as RAID 1 mirror disk. ASM does not duplicate records. When a drive is removed due to a permanent failure, ASM will begin to rebalance and copy data that is necessary to maintain the data redundancy on the remaining disks within a group of disk failure. It will also attempt to evenly distribute the data on multiple devices.

Tags: Database

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