HP XP RAID Manager Software - Manual (Page 19)

Description 19
SnapShot employs two techniques:
• creating or mapping a virtual volume (V-VOL)
• copy-on-write to a SnapShot pool volume (pool-VOL) identified by a
pool ID.
SnapShot uses current BC commands with new arguments.
Note: SnapShot is used in Unix and Windows environments only. SnapShot does
not work in MPE/iX or OpenVMS environments.
The following figure illustrates the basic concept.
Pairs and pair management
Both BC (non-SnapShot) and CA continuously copy data from a primary
source volume known as a P-VOL to a secondary volume known as an
S-VOL.