1、 Check the disks :
ls -l /dev/mapper
brw-rw---- 1 root disk 253, 46 Jul 27 17:19 Prod_Orcl01
brw-rw---- 1 root disk 253, 67 Jul 27 17:59 Prod_Orcl02
brw-rw---- 1 root disk 253, 36 Jul 27 17:19 Prod_Orcl03
brw-rw---- 1 root disk 253, 58 Jul 27 18:00 Prod_Orcl04
2、Configure ASMLIB to use multipath (from each node on RAC environments):
By any path the ASMLIB can found the disks, but, the best path is using the multipath :
Modify in
/etc/sysconfig/oracleasm :
ORACLEASM_SCANORDER=”dm”
ORACLEASM_SCANEXCLUDE=”sd”
note: The Oracle ASMLib configuration file is located at /etc/sysconfig/oracleasm. It is a link to file /etc/sysconfig/oracleasm-_dev_oracleasm.
Restart ASMLIB
(from each node on RAC environments):
/etc/init.d/oracleasm stop
/etc/init.d/oracleasm start
3. Create the ASMLIB disks on mapper partitions as follow:
/etc/init.d/oracleasm createdisk DSKORA1 /dev/mapper/Prod_Orcl01
/etc/init.d/oracleasm createdisk DSKORA2 /dev/mapper/Prod_Orcl02
After create the disks, the ASM put a mark on the disks to know which are your own.
4. If this is a RAC configuration, then from each node execute:
/etc/init.d/oracleasm scandisks
/etc/init.d/oracleasm listdisks
5. Verify if the configuration is correct:
5.1 During the disk discovery, ASMLIB uses file /proc/partitions, see :
# cat /proc/partitions
8 0 877264896 sda
8 1 104391 sda1
8 2 877157032 sda2
8 16 209715200 sdb
8 32 382730240 sdc
8 48 379596800 sdd
8 64 2097152 sde
8 80 2097152 sdf
8 96 1169776640 sdg
253 6 209715200 dm-6
253 7 382730240 dm-7
253 8 379596800 dm-8
253 9 2097152 dm-9
253 10 2097152 dm-10
5.2 The ASMLIB mount disks at /dev/oracleasm/disks, see:
# ls -la /dev/oracleasm/disks
brw-rw---- 1 grid asmadmin 253, 6 Ago 16 16:33 DSKORA1
brw-rw---- 1 grid asmadmin 253, 7 Ago 16 16:33 DSKORA2
5.3 Check if major and minor of disks “dm” not “sd”, is the same in /proc/partitions and /dev/oracleasm/disks , see “253″ and “6″ bellow:
/proc/partitions 253 6 209715200 dm-6
/dev/oracleasm/disks
brw-rw---- 1 grid asmadmin 253, 6 Ago 16 16:33 DSKORA1
You can check using querydisk too :
# /etc/init.d/oracleasm querydisk -d DSKORA1
Disk "DSKORA1" is valid ASM disk on device [253, 6]
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