Embedded Files
In order to confirm whether a disk is part of an ASM diskgroup when the ASM instance is unavailable...
e.g. if ASM has been shut down but you want to be sure of which disks can be removed from the system.For AIX... Use lspv to list all disks in system.
If all disks have a PVID and a Volume Group associated with them, then it is unlikely they are formatted for ASM.
lspv
hdisk0 00cf3ab32f254ad0 oravg active
hdisk1 none None
hdisk2 none None
hdisk4 00cf3ab3506176e8 orau02vg active
hdisk5 00cf3ab3506ed253 orafravg active
hdisk6 00cf3ab30173c8c3 rootvg active
For Linux... Use lsblk to identify disk that are not part of LVM and do not have a mount point...
lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 58G 0 disk
|-sda1 8:1 0 486M 0 part /boot/efi
|-sda2 8:2 0 1.4G 0 part /boot
`-sda3 8:3 0 52.2G 0 part
|-VolGroupSys4-LogVolRoot 249:0 0 35G 0 lvm /
`-VolGroupSys4-LogVolSwap 249:1 0 16G 0 lvm [SWAP]
sdb 8:16 0 64G 0 disk
sdc 8:32 0 64G 0 disk
sdd 8:48 0 64G 0 disk
sde 8:64 0 64G 0 disk
sdf 8:80 0 200G 0 disk /u01
sdg 8:96 0 64G 0 disk
sdh 8:112 0 64G 0 disk
sdi 8:128 0 64G 0 disk
sdj 8:144 0 64G 0 disk
asm!commonstore-392 248:200705 0 5G 0 disk /opt/oracle/dcs/commonstore
Use ls -alF to check for hard links (as for AIX above), soft links and device ownership for further clues...
ls -alF /dev/hdisk2
brw------- Â Â 1 root system 13, 3 04 Jul 13:58 /dev/hdisk2
ls -alF /dev | grep "13, 3"
brw------- Â Â 1 root system 13, 3 04 Jul 13:58 hdisk2
crw-rw---- Â Â 1 asm oinstall 13, 3 04 Jul 13:58 oraasm2
crw------- Â Â 1 root system 13, 3 04 Jul 13:58 rhdisk2
The output above shows that /dev/hdisk2 has a hard link called /dev/orasam2 which is is owned by 'asm'ls -alF /dev/sdj
brw-rw---- 1 grid asmadmin 8, 144 Dec 20 09:05 /dev/sdj
ls -alF /dev | grep sdj
lrwxrwxrwx 1 root root 3 Dec 20 09:05 DATADISK3 -> sdj
brw-rw---- 1 grid asmadmin 8, 144 Dec 20 09:05 sdj
The output above confirms that the device is owner by asmadmin and a soft link is in place (so sdj is also known as DATADISK3Assuming the ASM software has not been deinstalled... Log in as the ASM owner (e.g. ;asm' or 'grid')...
kfed read /dev/oraasm2 | egrep "kfdhdb.dskname|kfdhdb.grpname|kfdhdb.fgname|kfdhdb.dsksize"
kfdhdb.dskname: ORARECO_0000 ; 0x028: length=12
kfdhdb.grpname: ORARECO ; 0x048: length=7
kfdhdb.fgname: ORARECO_0000 ; 0x068: length=12
kfdhdb.dsksize: 102400 ; 0x0c4: 0x00019000
Or, for full output...
kfed read /dev/oraasm2
KFED Utility
KFED Utility
You may need to create the kfed executable if it doesn't exist...
With the ASM environment set...
cd $ORACLE_HOME/rdbms/lib
make -f ins_rdbms.mk ikfed
ls -l $ORACLE_HOME/bin/kfed
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