HP StorageWorks XP Remote Web Console Software - Manual (Page 29)

TrueCopy for z/OS user guide 29
stored in the bitmap is Track or Cylinder. When adding a pair (Add Pair), you can select Track or Cylinder
and you can also confirm the unit.
When you add a pair with the setting of Track, the number of pairs you can create is restricted. If you
create the pairs more than the restricted number, a pair is automatically added with Cylinder. You can
restrict the automatic change of the setting. Before using this function, contact your HP account support
representative.
The restriction of the number of pairs depends on the capacity of the volumes used for the pairs. Both of the
MCU and RCU are restricted.
The number of bitmap area in the disk array is 10,476. You can calculate the number of bitmap area. If
the calculated bitmap area exceeds the number of bitmap area in the disk array, adding pairs operation is
restricted.
To calculate the number of bitmap area, you can use the following equation:
( (K (Number of Cylinders * 15) / 75,136) K) - 1
TrueCopy Asynchronous Recordset Operations
The TC390A recordsets contain the TC390A M-VOL updates and the associated control information,
including the time-stamp of the M-VOL update, which enables the RCU to maintain update consistency of
the TC390A R-VOLs. TC390A recordset operations include:
• Creating and storing recordsets at the MCU
Table 5 Operation of the unit of data stored in bitmap
Program The Unit of Data Stored in Bitmap Confirmation
Default (Auto)
1
1. Default (Auto) means that Track or Cylinder is automatically set according to the capacity (number of cylinders or number
of cylinders set by VLL) of the volumes used for the pairs. For volumes that have 10,019 cylinders or more, Cylinder is set.
For other volumes, Track is set.
Track Cylinder
Command View XP
or XP Remote Web
Console
Available Available Available Available
PPRC TSO Not available Not available Not available Not available
Table 6 Maximum Number of Pairs According to Each Emulation Type, when pairs are created without
use of customized volume
Emulation
Type
Number of
Cylinders
Number of
Bitmap Areas
Maximum Number of Pairs
(Added Shared Memory:
1 set)
Maximum Number of Pairs
(Added Shared Memory:
2 sets)
3380-J 885 1 11,605 16,384
3380-E 1,770 1 11,605 16,384
3380-K 2,655 1 11,605 16,384
3380-3 3,339 1 11,605 16,384
3390-1 1,113 1 11,605 16,384
3390-2 2,226 1 11,605 16,384
3390-3
3390-3R 3,339 1 11,605 16,384
3390-9 10,017 2 5,802 14,335
3390-L 32,760 5 2,321 5,734
3390-M 65,520 9 1,289 3,185