HP StorageWorks XP Remote Web Console Software - Manual (Page 149)

The CESTPAIR TSO command can be used to add TrueCopy for Mainframe Sync and Async pairs.
CESTPAIR does not allow you to specify the initial copy priority, or DFW to R-VOL option.
Initial Copy Options
When you add new TrueCopy pairs, you select the initial copy options on the Add Pair dialog
box. After a pair has been added (for example, the add pair operation has started), you cannot
change the initial copy options, unless you release and then restart the pair.
Initial Copy. Specifies the initial copy mode for the new pair(s).
•
If Entire Volume is selected, the initial copy operation will copy the data in all tracks on the
M-VOL (except diagnostic and unassigned alternate tracks) to the R-VOL. This setting is
functionally equivalent to the MODE=COPY parameter for the CESTPAIR command.
•
If None is selected, the initial copy operation will not be performed. The MCU will begin
performing update copy operations as needed. This setting is functionally equivalent to the
MODE=NOCOPY parameter for the CESTPAIR command.
CAUTION: The user must ensure that the M-VOL and R-VOL are already identical when using
this setting.
Copy Pace. Specifies the maximum number of tracks that can be copied at one remote I/O by the
TrueCopy for Mainframe initial copy operation before the MCU accepts another host request:
•
15 Tracks: speeds up the initial copy operation but may affect the storage system's I/O
performance if the M-VOL is experiencing high write I/O activity. This setting is functionally
equivalent to the PACE=2-255 parameter for the CESTPAIR TSO command.
•
3 Tracks: slows down the initial copy operation to minimize the impact of the initial copy
operation on the storage system's I/O performance. This setting is functionally equivalent to
the PACE=1 parameter for the CESTPAIR command.
Priority. Specifies the order in which the initial copy operations will be performed, if the number
of requested initial copy operations is greater than the maximum initial copy activities setting on
the System Option window. The highest priority is 1, and the lowest priority is 256 (current default
= 32). The TrueCopy for Mainframe initial copy priority option can be used to spread initial copy
operations across array groups and/or array domains (ACP pairs) to reduce initial copy time and
to prevent host I/O contention.
Example: Let's say the maximum initial copy activities setting is 4, and you add 6 TrueCopy for
Mainframe pairs at the same time (for LDEVs 00 through 05) with the initial copy priority set as
follows:
The MCU will start the initial copy
operations for LDEVs 03, 05, 00, and
04 immediately, then start LDEV 01
when one of the first four initial copy
operations is complete, and then start
LDEV 02 when the next initial copy
operation is complete. If additional
TrueCopy for Mainframe pairs are
added, the MCU also prioritizes the
initial copy operations by time
requested, so that all TrueCopy for
Mainframe pairs in the first group are
started before any pair in the next group
is started. Priority M-VOL of TrueCopy for Mainframe pair
1 LDEV 03
2 LDEV 05
3 LDEV 00
4 LDEV 04
5 LDEVs 01, 02
The CESTPAIR TSO command does not support the initial copy priority option. When CESTPAIR
is used to establish TrueCopy for Mainframe pairs, the initial copy operations are performed in
the order that the CESTPAIR commands are issued.
Creating TrueCopy for Mainframe Pairs 149