Hitachi Universal Replicator (TM) for Mainframe User Guide: HP XP24000 Disk Array, HP XP20000 Disk Array (T5278-96044, May 2011)

Table 16 Number of Cylinders According to
Each Emulation Type (continued)
Number of CylindersEmulation type
10,0173390-9
32,7603390-L
65,5203390-M
1,770H6586-G
885H6586-J
2,655H6586-K
1,113H6588-1
3,436H6588-3
10,017H6588-9
32,760H6588-L
1,770NF80-E
885NF80-J
2,655NF80-K
• The number of the required bitmap areas:
The number of bitmap areas to be used by all data volumes that form pairs is calculated from
the number of cylinders. The calculated number of bitmap areas is referred to as the required
number of bitmap areas in the following formula. Use the following formula to calculate the
required number of bitmap areas for a data volume. The … symbols enclosing a value
indicate that the enclosed value should be rounded up to the nearest integer.
The required number of bitmap areas = ( ((number of cylinders × 15) ÷ 122,752) )
◦ number of cylinders × 15 indicates the number of slots
◦ 122,752 is the number of slots that a bitmap area can manage
NOTE: If the calculated required number of bitmap areas exceeds the total number of bitmap
areas in the storage system, the number of pairs that can be created will be limited.
• The maximum number of pairs that can be created:
The maximum possible number of pairs that can be created depends on the number of bitmap
areas of the storage system and the required number of bitmap areas required to create pairs.
The number of bitmap areas of the storage system depends on the capacity of shared memory.
The relationship between the area number of shared memory and the number of bitmap areas
in the storage system is described in Table 17 (page 56).
Table 17 Relationship between Additional Shared Memory and Total Number of Bitmap Areas
of the Storage System
Total Number of Bitmap Areas of Storage
System
Additional Shared Memory for Universal
Replicator for Mainframe
0No additional shared memory for Universal
Replicator for Mainframe
7,424Additional shared memory for Universal
Replicator for Mainframe is installed
16,384Extension 1
56 Preparing for Universal Replicator for Mainframe Operations