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GCOS 7 System Operator's Guide 6.3 Disk and Tape Operations This subsection is divided into 3 parts: • Volume Characteristics: describes the logical characteristics of the various types of volumes. • Premounting, mounting and dismounting: describes the system responses to physical operations. • Incidents: discusses various non-fatal incidents which can occur when the system is reading or writing to disk or tape. 6.3.1 Volume Characteristics The following is a description of the logical characteristics of the different categories of volumes supported by the system. Characteristics which are displayed by the DHW or DC operator command are denoted below in upper case. 6.3.1.1 Disks When the system first tries to access a disk, it looks for the disk volume label (which contains the volume name). If the volume label is present and in the correct format, the disk is identified as native; otherwise it is considered as non-standard (NSTD). The system can recognize several categories of native disks: 1. SYSTEM disk The SYSTEM disk is recognized as such because it is the disk from which Storage Load is performed; it supports the SYS.BKST0 file. It cannot be removed from the configuration by the MODIFY_HARDWARE_CONFIGURATION (MDHW) command. 2. RSDT disks (resident disk) The operator may define a disk as resident during System Loading. RSDT disks are disks which, like the SYSTEM disk and the backing store disks, are required in the configuration. (See question IL01 in Chapter 3 Starting and Terminating a GCOS 7 Session). 6-6 47 A2 53US
