The next example can be used to remove ASMLIB I/O access and allow ASM to access the block devices directly:
<<< Before Continue With The Next Action Plan, Please Make Sure You Have A Full Database Backup Of All The Databases Allocated In Your Diskgroup>>>
1) List all the existing ASMLIB disks to obtain the major and minor numbers (for this example I created DISK1 on /dev/sda5):
# /etc/init.d/oracleasm createdisk DISK1 /dev/sda5 Marking disk "/dev/sda5" as an ASM disk: [ OK ]
$> ls -l /dev/sda5 brw-rw---- 1 root disk 8, 5 May 5 22:27 /dev/sda5
$> oracleasm querydisk DISK1 Disk "DISK1" is a valid ASM disk on device [8, 5]
2) List all the existing diskgroups (for this example I created the TEST diskgroup):
SQL> create diskgroup TEST external redundancy disk 'ORCL:DISK1';
Diskgroup created.
SQL> select name from v$asm_diskgroup;
NAME ------------------------------ TEST
3) Check disk header thru kfed associated with all the ASM disks to make sure they are valid:
$> kfed read /dev/oracleasm/disks/DISK1 kfbh.endian: 1 ; 0x000: 0x01 kfbh.hard: 130 ; 0x001: 0x82 kfbh.type: 1 ; 0x002: KFBTYP_DISKHEAD kfbh.datfmt: 1 ; 0x003: 0x01 kfbh.block.blk: 0 ; 0x004: T=0 NUMB=0x0 kfbh.block.obj: 2147483648 ; 0x008: TYPE=0x8 NUMB=0x0 kfbh.check: 3723615947 ; 0x00c: 0xddf1decb kfbh.fcn.base: 0 ; 0x010: 0x00000000 kfbh.fcn.wrap: 0 ; 0x014: 0x00000000 kfbh.spare1: 0 ; 0x018: 0x00000000 kfbh.spare2: 0 ; 0x01c: 0x00000000 kfdhdb.driver.provstr: ORCLDISKDISK1 ; 0x000: length=13 kfdhdb.driver.reserved[0]: 1263749444 ; 0x008: 0x4b534944 kfdhdb.driver.reserved[1]: 49 ; 0x00c: 0x00000031 kfdhdb.driver.reserved[2]: 0 ; 0x010: 0x00000000 kfdhdb.driver.reserved[3]: 0 ; 0x014: 0x00000000 kfdhdb.driver.reserved[4]: 0 ; 0x018: 0x00000000 kfdhdb.driver.reserved[5]: 0 ; 0x01c: 0x00000000 kfdhdb.compat: 168820736 ; 0x020: 0x0a100000 . .
4) Dismount the diskgroups:
SQL> alter diskgroup TEST dismount;
Diskgroup altered.
5) Shutdown the ASM instance(s).
SQL> shutdown immediate
ASM instance shutdown
6) Unload the ASMLIB module and dismount the asmlib filesystem:
root@asmstorage ~]# cd /etc [root@asmstorage etc]# cd init.d [root@asmstorage init.d]# ./oracleasm stop Unmounting ASMlib driver filesystem: [ OK ] Unloading module "oracleasm": [ OK ]
7) Change the ownership for the block devices associated with the ASMLIB disks to oracle:dba:
[root@asmstorage dev]# ls -l /dev/sda5 brw-rw---- 1 root disk 8, 5 May 5 22:27 /dev/sda5 [root@asmstorage dev]# chown oracle:dba /dev/sda5 [root@asmstorage dev]# ls -l /dev/sda5 brw-rw---- 1 oracle dba 8, 5 May 5 22:27 /dev/sda5
8) Startup the ASM instance(s):
SQL> startup ASM instance started
Total System Global Area 284565504 bytes Fixed Size 1299428 bytes Variable Size 258100252 bytes ASM Cache 25165824 bytes ORA-15110: no diskgroups mounted
9) Update the asm_diskstring parameter pointing to the block devices:
SQL> alter system set asm_diskstring = '/dev/sda5' scope=memory;
System altered.
SQL> show parameter asm_diskstring
NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ asm_diskstring string /dev/sda5 SQL>
10) Finally, mount the diskgroups:
SQL> alter diskgroup test mount;
Diskgroup altered.
SQL> select name, state from v$asm_diskgroup;
NAME STATE ------------------------------ ----------- TEST MOUNTED
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