When create a Diskgroup the ASM diskname is created per default for you. The name of the disk typically looks like Diskgroupname an some Digits.
First check your current diskname.
SQL>col name format a12 SQL>col path format a30 SQL>SELECT name, path FROM v$asm_disk WHERE group_number = (SELECT group_number FROM v$asm_diskgroup WHERE name = 'DG_DATA'); NAME PATH ------------ ------------------------------ DG_DATA_0000 /dev/oracleasm/disks/ORA_DISK1
The diskname DG_DATA_0000 is not very intuitiv because it tells nothing about the diskshelf or the storage the disk belongs to. For this example we want to rename the diskname to DG_DATA_0_ST1_FG1 which means Storage1 and Failgroup 1.
For renaming a disk in ASM we must remount the Diskgroup in restricted mode.
SQL> alter diskgroup dg_data dismount; Diskgroup altered. SQL> alter diskgroup dg_data mount restricted; Diskgroup altered.
After mounting the diskgroup in restricted mode, we can now rename the diskname.
SQL> alter diskgroup DG_DATA rename disk 'DG_DATA_0000' to 'DG_DATA_0_ST1_FG1'; Diskgroup altered.
Now the Disk is renamed. Query the v$ASM_DISK View to check for the new name.
SQL> SELECT name, path FROM v$asm_disk WHERE group_number = (SELECT group_number FROM v$asm_diskgroup WHERE name = 'DG_DATA'); NAME PATH ----------------- ------------------------------------- DG_DATA_0_ST1_FG1 /dev/oracleasm/disks/ORA_DISK1
Don`t forget that the diskgroup is in restricted mode. If you have finished your work remount them in normal mode.
