Steps to Add ASM disk to diskgroup

1. Check existing diskgroup details and redundancy

[oracle@orahost01 ~]$ . oraenv
ORACLE_SID = [+ASM] ?
The Oracle base remains unchanged with value /u01/app/oracle

[oracle@orahost01 ~]$ asmcmd

ASMCMD> lsdg
State    Type    Rebal  Sector  Block       AU  Total_MB  Free_MB  Req_mir_free_MB  Usable_file_MB  Offline_disks  Voting_files  Name
MOUNTED  EXTERN  N         512   4096  1048576   1817119   499770                0          499770              0             N  DATA/
MOUNTED  NORMAL  N         512   4096  1048576    550160   543956           137540          203208              0             N  FRA/
MOUNTED  NORMAL  N         512   4096  1048576     18435    18256             6145            6055              0             N  OCR/

OR

[oracle@orahost01 ~]$ sqlplus / as sysasm

SQL*Plus: Release 11.2.0.4.0 Production on Fri Dec 6 04:45:11 2019

Copyright (c) 1982, 2013, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Automatic Storage Management option

SQL> select state, name, type from v$asm_diskgroup;

STATE       NAME                           TYPE
----------- ------------------------------ ------
MOUNTED     DATA                           EXTERN
MOUNTED     FRA                            NORMAL
MOUNTED     OCR                            NORMAL

2. Check existing disk details

SQL> select GROUP_NUMBER,MOUNT_STATUS,STATE,REDUNDANCY,NAME,PATH from v$asm_disk;
GROUP_NUMBER MOUNT_S STATE    REDUNDA NAME                 PATH
------------ ------- -------- ------- --------- ------------
           0 CLOSED  NORMAL   UNKNOWN                      /dev/oracleasm/disks/ASMDATA06
           1 CACHED  NORMAL   UNKNOWN DATA05               /dev/oracleasm/disks/ASMDATA05
           1 CACHED  NORMAL   UNKNOWN DATA04               /dev/oracleasm/disks/ASMDATA04
           1 CACHED  NORMAL   UNKNOWN DATA03               /dev/oracleasm/disks/ASMDATA03
           1 CACHED  NORMAL   UNKNOWN DATA02               /dev/oracleasm/disks/ASMDATA02
           1 CACHED  NORMAL   UNKNOWN DATA01               /dev/oracleasm/disks/ASMDATA01
           3 CACHED  NORMAL   UNKNOWN OCR_00             /dev/oracleasm/disks/OCR_01
           2 CACHED  NORMAL   UNKNOWN FRA_01               /dev/oracleasm/disks/FRA_01
           2 CACHED  NORMAL   UNKNOWN FRA_02               /dev/oracleasm/disks/FRA_02

9 rows selected.

3. Add the disk into diskgroup with same naming convention

SQL> alter diskgroup DATA add disk '/dev/oracleasm/disks/ASMDATA06' name DATA06;

Diskgroup altered.

4. Check the current size of diskgroup after adding the disk

SQL> select GROUP_NUMBER,NAME,STATE,TYPE,TOTAL_MB,FREE_MB from v$asm_diskgroup
 order by 1;

GROUP_NUMBER NAME        STATE     TYPE   TOTAL_MB   FREE_MB
------------ --------- --------- ------ ---------- ----------
           1 DATA                 MOUNTED     EXTERN    2329103    1011748
           2 FRA                  MOUNTED     NORMAL     550160     543956
           3 OCR                  MOUNTED     NORMAL      18435      18256

5. You can check the status of the process from below sql statement

SQL> select operation, state, sofar, est_work, est_minutes from v$asm_operation where group_number=1;

OPERATION STATE      SOFAR   EST_WORK EST_MINUTES
----- ---- ---------- ---------- -----------
REBAL RUN        3346     361739         107

 SQL> select operation, state,power, actual, sofar, est_work, est_minutes from v$asm_operation where group_number=1;

OPERATION STATE POWER ACTUAL     SOFAR   EST_WORK EST_MINUTES
----- ----- ---- ---- ------- ------ ---------
REBAL RUN   1   1  3456     361740         115

5. You can speed up the re-balancing process by changing power limit for diskgroup

SQL> Alter diskgroup DATA rebalance power 4;

SQL> select operation, state,power, actual, sofar, est_work, est_minutes from v$asm_operation where group_number=1;

OPERATION STATE POWER ACTUAL     SOFAR   EST_WORK EST_MINUTES
----- ----- ---- ---- ------- ------ ---------
REBAL RUN   4   4  1200     324740         205