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| Disk device naming in VxVM | ||
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There are two different methods of naming disk devices:
Under operating system-based naming, all disk devices except fabric mode disks are displayed either using the legacy c#t#d# format or the persistent disk## format. By default, VxVM commands display the names of these devices in the legacy format as these correspond to the names of the metanodes that are created by DMP.
The syntax of a legacy device name is c#t#d#, where c# represents a controller on a host bus adapter, t# is the target controller ID, and d# identifies a disk on the target controller.
Fabric mode disk devices are named as follows:
# format. For example, disks in the supported disk array name FirstFloor are named FirstFloor_0, FirstFloor_1, FirstFloor_2 and so on. (You can use the vxdmpadm command to administer enclosure names.)
DISKS category (JBOD disks) are named using the Disk_# format.
OTHER_DISKS category (disks that are not multipathed by DMP) are named using the fabric_# format.
Enclosure-based naming operates as follows:
# format. For example, disks in the supported disk array, enggdept are named enggdept_0, enggdept_1, enggdept_2 and so on. (You can use the vxdmpadm command to administer enclosure names. See Administering DMP using vxdmpadm and the vxdmpadm(1M) manual page for more information.)
DISKS category (JBOD disks) are named using the Disk_# format.
OTHER_DISKS category (disks that are not multipathed by DMP) are named as follows:
See Changing the disk-naming scheme for details of how to switch between the operating system and enclosure based naming schemes.
To display the native OS device names of a VM disk (such as mydg01), use the following command:
# vxdisk path | egrep diskname
For information on how to rename an enclosure, see Renaming an enclosure.
For a description of disk categories, see Disk categories.