Physical objects

A physical disk is the basic storage device (media) where the data is ultimately stored. You can access the data on a physical disk by using a device name to locate the disk. The physical disk device name varies with the computer system you use. Not all parameters are used on all systems.

Typical device names are of the form sda or hdb, where sda references the first (a) SCSI disk, and hdb references the second (b) EIDE disk.

Figure: Physical disk example shows how a physical disk and device name (devname) are illustrated in this document.

Figure: Physical disk example

Physical disk example

VxVM writes identification information on physical disks under VxVM control (VM disks). VxVM disks can be identified even after physical disk disconnection or system outages. VxVM can then re-form disk groups and logical objects to provide failure detection and to speed system recovery.