HP XP P9500 Reference Manual page 78

Table 48 Contents of the Copy Group Attributes Panel (continued)
Item
FLOW CTL
DIF UNIT
Preset Mode
78 ISPF Panels
Description
Specify the sidefile flow restriction
(required for TCA).
Y: Restricts the flow of host
update I/O on the S-VOL
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 P9000 Continuous Access
Synchronous for Mainframe
Systems User Guide
HP P9000 Continuous Access
Synchronous User Guide
Hitachi TrueCopy for Mainframe
User Guide: HP XP24000 Disk
Array, HP XP20000 Disk Array
Specify a unit to manage the
differential data between P-VOL
data and S-VOL data
(differential-data management unit).
CYL: Manages by cylinder unit
TRK: Manages by track unit
NOTE: If track (TRK) is 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 P9000 Continuous
Access Synchronous for Mainframe
Systems User Guide or the HP
P9000 Continuous Access
Synchronous User Guide.
Specify the number corresponding
to the ATTIME suspend function and
suspend mode you want to use
Copy type When effective
CAA
When the YKMAKE
command is executed
When the YKRESYNC
command is
executed.
CAA When the YKMAKE
command is executed
BC When the YKSUSPND
command is executed
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