Dropping disk in ASM by this method will mark the disk for drop and then start doing rebalance. Once it completes moving data off the ear-marked disks then it will remove that disk from diskgroup.
This is different concept than dropping disks on OS and storage level, as in both disk are unavailable straight away after comman executes.
This also helps to do addition and deletion of disks by doing one rebalance. So if new disks are added and straight after that old disks are dropped in ASM then ASM will only do one rebalance considering both new and removed disks.
Alter diskgroup DATA drop disk '/dev/data_disk1';
Diskgroup altered.
This is different concept than dropping disks on OS and storage level, as in both disk are unavailable straight away after comman executes.
This also helps to do addition and deletion of disks by doing one rebalance. So if new disks are added and straight after that old disks are dropped in ASM then ASM will only do one rebalance considering both new and removed disks.
Alter diskgroup DATA drop disk '/dev/data_disk1';
Diskgroup altered.
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