The following functions are available for local replication:
For ETERNUS DX/AF, the QuickOPC, EC (Equivalent Copy) and SnapOPC+ functions
For Symmetrix, the TimeFinder product family
For VMAX3 TimeFinder SnapVX
QuickOPC
QuickOPC creates (additional) copies of application data within a storage system. When it has been split from the original data, the copied data can then be edited separately. QuickOPC has the following properties:
QuickOPC creates a complete copy of the data. They are available immediately on the target unit. The creation of the data copy from the original unit to the target unit is carried out in the background. A detailed description of this function is provided in the chapter "Local replication with clones (ETERNUS DX/AF, Symmetrix/VMAX3)".
High-performance and highly available physical copies (on clone units) of the application data
Copies are available immediately
100% additional requirement for capacity for each copy
Ideal for applications with a high level of updating and for migration without affecting the storage system by upkeeping the mirroring
EC (Equivalent Copy)
EC creates (additional) copies of application data within a storage system. When it has been split from the original data, the copied data can then be edited separately. EC has the following properties:
EC creates a complete copy of the data. The data is available once the initial copying of the data from the original unit to the target unit has been completed. A detailed description of this function is provided in the chapter "Local replication with clones (ETERNUS DX/AF, Symmetrix/VMAX3)".
High-performance and highly available physical copies (on clone units) of the application data
Copies are available after the copy processes have terminated
100% additional requirement for capacity for each copy
Ideal for applications with a high level of updating and for migration
SnapOPC+
SnapOPC+ creates space-saving "snapshot" copies of application data within a storage system. SnapOPC+ has the following properties:
SnapOPC+ creates a "snapshot" of the data which is immediately available. A detailed description of this function is provided in the chapter "Local replication with snapshots (ETERNUS DX/AF, Symmetrix/VMAX3)".
Low additional requirement for capacity depending on the level of updating
Ideal for applications with a low level of updating
The QuickOPC, EC (Equivalent Copy) and SnapOPC+ functions can be combined. When used in combination for the same original unit, general conditions must be borne in mind, see section "QuickOPC/EC and SnapOPC+ (ETERNUS DX/AF)".
TimeFinder for Symmetrix
The TimeFinder product family from EMC creates (additional) copies of the application data within a storage system. When it has been split from the original data, the copied data can then be edited separately.
The following replication functions are available:
TimeFinder/Clone: immediately available copy of the data. A detailed description of this function is provided in the chapter "Local replication with clones (ETERNUS DX/AF, Symmetrix/VMAX3)".
TimeFinder/Snap: Directly available “snapshot” of the data. A detailed description of this function is provided in the chapter "Local replication with snapshots (ETERNUS DX/AF, Symmetrix/VMAX3)".
The TimeFinder/Clone and TimeFinder/Snap functions can be combined with each other. If they are used in combination for the same original unit, a number of constraints must be borne in mind which are explained in detail in the descriptions of the various functions. The constraints must be taken into consideration above all when restoring the original data from a snap unit or clone unit.
TimeFinder/Clone
High-performance logical copies of the application data
Immediate availability of the copies
100% additional requirement for capacity for each copy
High availability can optionally be achieved through complete copy
Ideal for applications with a high level of updating and for migration
TimeFinder/Snap
“Snapshot” copies of the application data which save capacity
Low additional requirement for capacity depending on the level of updating
Immediate availability of the copies
No complete copy, consequently dependent on the availability of the original
Ideal for applications with a low level of updating
TimeFinder SnapVX for VMAX3
The TimeFinder SnapVX product from EMC creates (additional) copies of the application data within a storage system. The copied data can be used independently of the original data.
The following replication functions are available:
TimeFinder SnapVX:
immediately available "snapshots" of the data in the storage system. The snapshots are available dynamically as snap units. A detailed description of this function is provided in the chapter "Local replication with snapshots (ETERNUS DX/AF, Symmetrix/VMAX3)".
In SHC-OSD this function is implemented compatibly in the existing functional scope by TimeFinder/Snap.TimeFinder/Clone: immediately available copy of the data. A detailed description of this function is provided in the chapter "Local replication with clones (ETERNUS DX/AF, Symmetrix/VMAX3)".
In SHC-OSD this function is implemented compatibly. SYMAPI emulates TimeFinder/Clone via TimeFinder SnapVX.
The TimeFinder SnapVX function cannot be combined with TimeFinder/Clone at volume level.
TimeFinder SnapVX
Capacity-saving "snapshot" copies of the application data in the joint thin pool
Emulation of the functions of TimeFinder/Clone
No separate snap pool required
Immediate availability and dynamic assignment of the copies
Maximum flexibility