In Linux, ASMLib provides the wrapper for managing the ASM disks. To identify the underlying physical device that the ASM disk point to, you can use the oracleasm querydisk command. In this blog, we will teach you how to identify the ASM device from ASMLib.
The querydisk option will list the major and minor numbers that can be used to match the physical device.
The following example was run on a virtual server hosting ASM and an Oracle database.
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[root@oraclevm ~]# oracleasm listdisks DATA1 [root@oraclevm ~]# oracleasm querydisk -d DATA1 Disk “DATA1” is a valid ASM disk on device [8,17] [root@oraclevm ~]# ls -ltr /dev/sd* brw–rw——. 1 root disk 8, 0 Dec 14 18:18 /dev/sda brw–rw——. 1 root disk 8, 2 Dec 14 18:18 /dev/sda2 brw–rw——. 1 root disk 8, 1 Dec 14 18:18 /dev/sda1 brw–rw——. 1 root disk 8, 16 Dec 14 18:18 /dev/sdb <strong>brw–rw——. 1 root disk 8, 17 Dec 14 18:18 /dev/sdb1</strong> [root@oraclevm ~]# |
In the above example, DATA1 disk is pointing to the /dev/sdb1. The major 8 is block based and refers to SCSI disk devices type.
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