HP StorageWorks XP Remote Web Console Software - Manual (Page 116)

116 TrueCopy for the XP128/XP1024/XP10000/XP12000
• If Status is selected, the M-VOL will be fenced only if the MCU is not able to change the R-VOL pair
status to suspended when an update copy operation fails. If the MCU changes the R-VOL pair status
to suspended, subsequent write operations to the M-VOL will be permitted and the MCU will keep
track of all updates to the M-VOL while the pair is suspended. This setting is functionally equivalent
to the CRIT(YES-PATHS) parameter for the CESTPAIR command.
• If Never is selected, the M-VOL will never be fenced. If the TC390 volume pair is suspended, write
operations to the M-VOL will be accepted. This setting is functionally equivalent to the CRIT(NO)
parameter for the CESTPAIR command.
• Initial Copy Parameters: Select the initial copy options.
• Initial Copy. This option specifies the initial copy mode for the new pair(s).
If Entire is selected, the initial copy operation will copy all cylinders 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 No Copy 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.
• The Initial Copy Pace option specifies the maximum number of tracks that can be copied at one time
by the TC390 initial copy operation before the MCU accepts another host request:
The 15 Tracks setting speeds up the initial copy operation, but may affect the disk array’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.
The 3 Tracks setting slows down the initial copy operation to minimize the impact of the initial copy
operation on the disk array’s I/O performance. This setting is functionally equivalent to the PACE=1
parameter for the CESTPAIR command.
• Priority (From 1 to 256): The initial copy 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 activity setting on the RCU Option window (see ” Registering an RCU (Add
RCU) ” on page 81). The highest priority is 1 and the lowest priority is 256 (current default = 32).
The TC390 initial copy priority option can be used to spread initial copy operations across disk
array groups and/or disk array domains (ACP pairs) to reduce initial copy time as well as host I/O
contention.
Example: The maximum initial copy activity setting is 4 and you add 6 TC390 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 TC390 pairs are added, the MCU also
prioritizes the initial copy operations by time requested so that all TC390 pairs in the first group are
started before any pair in the next group is started.
M-VOL of TC390 pair Priority
LDEV 03 1
LDEV 05 2
LDEV 00 3
LDEV 04 4
LDEVs 01, 02 5