Max. Numb. Of Pairs Accord. To Ea. Emul. Type, When Pairs Are Created Without Cust. Vol; Unit For Storing The Differential Data - HP StorageWorks XP12000 User Manual

The ↑...↑ symbols around a value indicate that the value should be rounded up to the next integer.
• To calculate the maximum number of pairs that you can create:
• Where the added shared memory is one pair:
The maximum number of pairs that you can create = ( ↑ (1 1,605 ÷ Number of bitmap areas) ↑ )
The ↑...↑ symbols around a value indicate that the value should be rounded up to the next integer.
• Where the added shared memory is two pairs:
The maximum number of pairs that you can create = ( ↑ (28,671 ÷ Number of bitmap areas) ↑ )
The ↑...↑ symbols around a value indicate that the value should be rounded up to the next integer.
NOTE:
The maximum number of pairs that you can create cannot exceed 16,384.
Table 4 Max. numb. of pairs accord. to ea. emul. type, when pairs are created
without cust. vol.
Emulation type
OPEN-3
OPEN-8
OPEN-9
OPEN-E
OPEN-L
NOTE:
The capacity of OPEN-V is variable. To get the maximum number of pairs of OPEN-V, calculate
by using the formula.
CAUTION:
The bitmap areas that are used for Continuous Access XP are shared with Continuous Access XP
Journal. If you use both Continuous Access XP and Continuous Access XP Journal, use the total
value of both pairs.
• The unit of Difference Management (track or cylinder) differs according to the combination of
arrays. The differential data is stored in units of tracks or cylinders (see
Table 5 Unit for storing the differential data
XP12000/XP10000/SVS200
XP1024/XP128
22
Continuous Access XP for the Array
Number of Number of
cylinders bitmap areas
3,339 1
9,967 2
10,017 2 2
19,760 3 3
49,440 7 7
XP12000/XP10000/SVS200
Track or Cylinder
Track or Cylinder
Maximum Maximum
number of pairs number of pairs
(added shared (added shared
memory: 1 pair) memory: 2
pairs)
1 1,605 16,384
5,802 14,335
5,802 14,335
3,868 9,557
1,657 4,095
Table 5).
XP1024/XP128
Track or Cylinder
Track or Cylinder