Re: cannot mount ASM disk

Posted by ErmanArslansOracleBlog on Sep 25, 2017; 3:37pm
URL: http://erman-arslan-s-oracle-forum.124.s1.nabble.com/cannot-mount-ASM-disk-tp3539p3596.html

In addition,

ensure that the permissions of the disks are okay and udev rules are present  and the asm_diskstring is set properly.

Here is an example:

Udev rule:

 cat 99-oracle-asmdevices.rules
KERNEL=="sde", OWNER="oracle", GROUP="oinstall", MODE="0660"
KERNEL=="sdf", OWNER="oracle", GROUP="oinstall", MODE="0660"
KERNEL=="sde1", OWNER="oracle", GROUP="oinstall", MODE="0660"
KERNEL=="sdf1", OWNER="oracle", GROUP="oinstall", MODE="0660"

Udev restart

udevadm control --reload-rules && udevadm trigger

SQL> alter system set asm_diskstring='ORCL:*','/dev/sd*' scope=memory;

Mount:

SQL>  alter diskgroup ERMAN mount;

Diskgroup altered.

Sometimes, when you don't use asmlib/oracleasm for adding ASM devices, these udev rules may be missing. Also when you don't use oracleasm/asmlib, ASM needs to see the /dev device name directly (/dev/sd devices), so you should configure your asm_diskstring properly.