oracleasm create disk error – device is not a partition

[root@mytest1 /]# /etc/init.d/oracleasm createdisk ASM_DISK1 /dev/emcpowera1
Marking disk “/dev/emcpowera1” as an ASM disk: asmtool: Device “/dev/emcpowera1” is not a partition

Symptom  above looks familiar? This is non Oracle ASMlib issue, but EMCPOWER PATH issue.

Applies to:

Linux x86 & Linux x86-64


Error shown above even though the disk is properly formatted and has the requisite partition.


EMC Powerpath Versions 5.0.1 and 5.1 do not properly support the i/o calls that oracleasm makes.


To implement the solution, please execute the following steps,

1. Do the “/etc/init.d/oracleasm createdisk” operation using the “asmtool” command directly:

/usr/sbin/asmtool -C -l /dev/oracleasm -n <ASM Disk Name> -s /dev/<emc device> -a force=yes

The tool will report:

asmtool: Device “/dev/<emc device>” is not a partition
asmtool: Continuing anyway

2. The permissions of the volume under /dev/oracleasm/disks/ will be “root: root”.  Reboot the system to correct this.

3. Further use of the device can now be done normally using the powerpath device name.

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