The ORACLEASM_SCANORDER variable specifies disks to be scanned first.

The ASMLIB configuration file is located in the path /etc/sysconfig/oracleasm. It contains all the startup configuration you specified with the command /usr/sbin/oracleasm configure. That command cannot configure scan ordering.

The configuration file contains many configuration variables. The ORACLEASM_SCANEXCLUDE variable specifies the disks that are to be ignored.

Configure values for ORACLEASM_SCANORDER using space-delimited prefix strings. A prefix string is the common string associated with a type of disk. For example, if you use the prefix string sd, then this string matches all SCSI devices, including /dev/sda, /dev/sdb, /dev/sdc and so on. Note that these are not globs. They do not use wild cards. They are simple prefixes. Also note that the path is not a part of the prefix. For example, the /dev/ path is not part of the prefix for SCSI disks that are in the path /dev/sd*.

For Oracle Linux and Red Hat Enterprise Linux, when scanning, the kernel sees the devices as /dev/mapper/XXX entries. By default, the device file naming scheme udev creates the /dev/mapper/XXX names for human readability. Any configuration using ORACLEASM_SCANORDER should use the /dev/mapper/XXX entries.