ASM & Storage
How to add a disk to an ASM disk group in Oracle
Add a disk to an ASM disk group with ALTER DISKGROUP ADD DISK, which starts an automatic rebalance, then verify the disk and rebalance.
How to mount or dismount an ASM disk group in Oracle
Mount or dismount an ASM disk group with ALTER DISKGROUP MOUNT / DISMOUNT, then verify its state in V$ASM_DISKGROUP.
How to rebalance an ASM disk group and set the power in Oracle
Start or adjust an ASM disk group rebalance and control its speed with ALTER DISKGROUP REBALANCE POWER, then watch it in V$ASM_OPERATION.
How to drop a disk from an ASM disk group in Oracle
Drop a disk from an ASM disk group with ALTER DISKGROUP DROP DISK; ASM evacuates its data by rebalance before the disk is released.
How to check ASM disk group free space in Oracle
Check Oracle ASM disk group total, free, and usable space, with real free percent accounting for mirroring and redundancy.
How to check ASM disks in Oracle
List Oracle ASM disks with path, header status, size, and read/write MB from v$asm_disk.
How to check ASM rebalance status in Oracle
Check running Oracle ASM rebalance operations: power, state, and estimated time remaining from gv$asm_operation.