Local replication with snapshots (ETERNUS DX/AF, Symmetrix/VMAX3)

The following functions are available for local replication with snapshots:

• for ETERNUS DX/AF the SnapOPC+ function with freely selectable snap units

• for ETERNUS DX/AF the SnapOPC+ function with snap data volumes as snap units

• For Symmetrix, the TimeFinder/Snap function

• For VMAX3, the TimeFinder SnapVX function

SHC-OSD implements TimeFinder SnapVX compatibly in the previous functional scope of TimeFinder/Snap with the previous interfaces. The statements in this chapter therefore generally also apply for VMAX3.

The functions execute in a similar manner and are controlled in BS2000 by SHC-OSD with the same commands. The functions are consequently (to some degree) presented in parallel in this chapter:

Section	Relevant for
SnapOPC+ (ETERNUS DX/AF)	ETERNUS DX/AF
Snap-Units (ETERNUS DX/AF)	ETERNUS DX/AF
TimeFinder/Snap (Symmetrix)	Symmetrix
Snap units (Symmetrix)	Symmetrix
TimeFinder SnapVX (VMAX3)	VMAX3
Snap units (VMAX3)	VMAX3
Status of the snap session and of the units	All functions and storage systems
Working with snap units	All functions and storage systems
SnapOPC+ and REC (ETERNUS DX/AF)	ETERNUS DX/AF
TimeFinder/Snap and SRDF (Symmetrix)	Symmetrix
TimeFinder SnapVX and SRDF (VMAX3)	VMAX3

Commands for SnapOPC+ (ETERNUS DX/AF), TimeFinder/Snap (Symmetrix) and TimeFinder SnapVX (VMAX3)

Command	Function
ACTIVATE-SNAP	Renames an activated snapshot pubset (ETERNUS DX/AF, VMAX3), Activating a snap pair (Symmetrix)
RESTORE-FROM-SNAP	Reconstructs an original unit from a snap unit
SHOW-SNAP-SESSION-STATUS	Displays the status of snap pairs
SHOW-STORAGE-CONFIGURATION	Displays the configuration (ETERNUS DX/AF)
SHOW-STORAGE-DEVICE-CONFIG	Displays device configuration (ETERNUS DX/AF)
SHOW-SYMMETRIX-CONFIGURATION	Displays the configuration (Symmetrix/VMAX3)
SHOW-SYMMETRIX-DEVICE-CONFIG	Displays device configuration (Symmetrix/VMAX3)
START-SNAP-SESSION	Creates and activates a snap pair (ETERNUS DX/AF, VMAX3) Creates a snap pair (Symmetrix)
STOP-SNAP-SESSION	Cancels a snap pair

¹ Not for VMAX3

The commands for these functions control replication functions which assign one or more snap units to an original unit and manage the snap pairs (snap sessions) created. The SHOW commands display the current processing status, the status of the snap sessions and the configuration.