Installation guide

Table 8–2: LSM Objects (cont.)
Object Description
Disk A collection of nonvolatile, read/write data blocks that are indexed
and can be quickly and randomly accessed. LSM supports standard
disk devices including SCSI and DSA disks. Each disk LSM uses is
given two identifiers: a disk access name and an administrative name.
Disk Group A collection of disks that share the same LSM configuration database.
The rootdg disk group is a special disk group that always exists.
LSM objects have the following relationships:
• A volume consists of one to eight plexes
• A plex consists of one or more subdisks
• A subdisk represents a specific portion of a disk
• Disks are grouped into disk groups
Figure 8–2 shows an LSM configuration that includes two plexes to protect
a file system or a database against data loss.
Administering the Logical Storage Manager 8–5