HP XP Continuous Access Software - Manual (Page 51)

NOTE:
If you use LUSE volumes, you must add 1 to the value calculated by the above formula.
• Maximum number of pairs that can be created:
Use the following formulas to calculate the maximum number of pairs you can create:
• When one pair of extended shared cache memories is used
Maximum number of pairs = ( ↓ (11,605 /Number of bitmap areas) ↓ )
The ↓…↓ symbols around a value indicate the value should be rounded down to the nearest
integer.
• When two pairs of extended shared cache memories are used
Maximum number of pairs = ( ↓ (28,671 /Number of bitmap areas) ↓ )
The ↓…↓ symbols around a value indicate the value should be rounded down to the nearest
integer.
NOTE:
If the calculated maximum number of pairs exceeds 16,384, the actual maximum number of
pairs is limited to 16,384.
NOTE:
The capacity of OPEN-V is variable. To calculate the maximum number of pairs for OPEN-V,
use the formula.
CAUTION:
Bitmap areas used for Continuous Access XP Journal are also used for Continuous Access XP.
If you use Continuous Access XP and Continuous Access XP Journal, use the total number of
both pairs.
Journal groups
Continuous Access XP Journal journal groups have the following requirements:
• Each Continuous Access XP Journal pair must be assigned to one and only one journal group.
• Table 14 lists journal group specifications.
Continuous Access XP Journal user guide 51