Hitachi G200 User Manual page 42

3 Calculate the maximum number of pairs, which is restricted by the
.
following:
¢
¢
3-14
Hitachi TrueCopy® User Guide for Hitachi Virtual Storage Platform Gx00 and Fx00 Models
The number of bitmap areas required for TrueCopy (calculated
above).
The total number of bitmap areas in the storage system. The number
of bitmap areas is as follows:
VSP G200: 36,000
VSP G400, VSP G600, VSP G800, and VSP F400, F600, F800: 65,536
The number of bitmap areas to be used is common to TrueCopy,
Universal Replicator, and global-active device. Therefore when you
use these software applications together, reduce the number of
bitmap areas for each software application from the total number of
bitmap areas for the storage system before calculating the maximum
number of pairs for TrueCopy in the following formula. For the method
of calculating the number of bitmap areas required for each software
application, see the relevant user guide.
Also, when TrueCopy and Universal Replicator share the same
volume, regardless of whether the shared volume is primary or
secondary, reduce the number of bitmap areas for each software
application from the total number of bitmap areas for the storage
system before calculating the maximum number of pairs for TrueCopy
in the following formula. For more information on calculating the
number of bitmap areas required for each software application, see
the relevant user guide.
Use the following formula to find the maximum number of pairs.
Maximum number of pairs = floor (Total number of bitmap
areas in the storage system / Required number of bitmap
areas)
Calculate the maximum number of pairs using the already calculated
necessary number of bitmap areas and the number of bitmap areas in
storage systems listed in the following table. The number of bitmap
areas in a storage system is determined by the storage system model
and the availability of control memory extended for TC.
Extension status
of control
memory for TC
No Extension Depends on the model:
•
•
With Extension Depends on the model:
•
•
Planning for TrueCopy
Number of bitmap areas in storage systems
VSP G200: 3,712
VSP G400, G600, G800, VSP F400, F600, F800: 0
VSP G200: 36,000
VSP G800, VSP G400, VSP G600, VSP F400, F600,
F800: 65,536