OracleASM operation considerations

1. alterdiskgroupdg_testadddropdisk is an asynchronous operation, and the ORACLE background will perform the REBALANCE operation. 2. ASMLIB discovers that the disk is marked as multi-path by default.

1. alter diskgroup dg_test add/drop disk is an asynchronous operation, and the ORACLE background will perform the REBALANCE operation. 2. ASMLIB finds that the disk is marked as multi-path by default.

1. alter diskgroup dg_test add/drop disk is an asynchronous operation, and the Oracle background performs the REBALANCE operation.

2. when the ASMLIB discovery mark disk is located on multiple paths, only the first device is found by default. This device is probably not a multi-path device, but a normal system device, resulting in invalid multi-path. You can modify the oracleasm-scanorder in/etc/sysconfig/oracleasm to preferentially find the multi-path device. Oracle asm only scans kernel device files. devices created using UDEV are not scanned. Therefore, only the device files created using UDEV can be found on oracleasm lib.

3. If you use oracleasm deletedisk to delete a disk in the deleted DISKGROUP, The learing disk header: failed will be reported. You must RESTART the CRS instance to delete the disk.

4. After oracleasm deletedisk is successful, use oracleasm scandisks and then oracleasm listdisks to view the deleted disk. Restart CRS to see the deleted disk.

Common Operations:

Alter diskgroup dg_test dismount;

Drop diskgroup dg_test;

Alter diskgroup dg_test rebalance power 5;