HP XP7 Business Continuity Manager Reference Guide (TK954-96004)

Table 49 Contents of the Copy Group Attributes Panel (continued)
When effectiveCopy typeDescriptionItem
CAASpecify the sidefile flow restriction
(required for TCA).
FLOW CTL
• When the YKMAKE
command is executed
• Y: Restricts the flow of host
update I/O on the S-VOL
• When the YKRESYNC
command is
executed.
7
depending on the usage
amount of the sidefiles.
Deterioration of the host’s I/O
performance is proportional
to the usage amount of the
sidefiles.
• N: Do not restrict the flow of
host update I/O on the S-VOL.
This prevents host I/O
performance deterioration on
crucial volumes. If the usage
amount exceeds the criteria,
the copy pair status becomes
SUSPCU
NOTE: If the C/T Group option
Inflow Control is not enabled in
the following models, FLOW CTL
will be disregarded even if set to
Y:
• XP12000/XP10000 Disk
Array
• XP24000/XP20000 Disk
Array
For details, see the one of the
following documents:
• HP XP7 Continuous Access
Synchronous for Mainframe
Systems User Guide
• HP XP7 Continuous Access
Journal for Mainframe Systems
User Guide
When the YKMAKE
command is executed
CAASpecify a unit to manage the
differential data between P-VOL
DIF UNIT
data and S-VOL data
(differential-data management
unit).
• CYL: Manages by cylinder
unit
• TRK: Manages by track unit
NOTE: If TRKis specified as the
differential-data management
unit, there is a limit to the number
of copy pairs that can be created
in each storage system. For
details, see the HP XP7
Continuous Access Synchronous
for Mainframe Systems User
Guide .
If you specify a blank space,
operations use the TRK unit.
For XP7, operations use the TRK
unit even if CYL is specified.
78 ISPF panels