VERITAS Volume Manager 3.5 Administrator's Guide (September 2002)

320 VERITAS Volume Manager Administrator’s Guide
read-writeback mode
A recovery mode in which each read operation recovers plex consistency for the region
coveredby theread. Plex consistencyis recoveredby reading data from blocksof oneplex
and writing the data to all other writable plexes.
root configuration
The configuration database for the root disk group. This is special in that it always
contains records for other disk groups, which are used for backup purposes only. It also
contains disk records that define all disk devices on the system.
root disk
The disk containing the root file system. This disk may be under VxVM control.
root disk group
A special private disk group that always exists on the system. The root disk group is
named rootdg. Even though rootdg is the default disk group, it does not necessarily
contain the root disk unless this is under VxVM control.
root file system
The initial file system mounted as part of the UNIX kernel startup sequence.
root partition
The disk region on which the root file system resides.
root volume
The VxVM volumethat containsthe rootfile system,if such avolume isdesignated by the
system configuration.
rootability
The ability to place the root file system and the swap device under VxVM control. The
resulting volumes can then be mirrored to provide redundancy and allow recovery in the
event of disk failure.
secondary path
In active/passive disk arrays, the paths to a disk other than the primary path are called
secondary paths. A disk is supposed to be accessed only through the primary path until it
fails, after which ownership of the disk is transferred to one of the secondary paths. Also
see path and primary path.