Registering Rcus To The Connected Mcu; Initial Copy Pace For Calculating Initial Copy Response Time - HP xp12000 User Manual

The default value of Round Trip Time is 1 ms. You can specify 1 ms to 500 ms. Use the following formula to
calculate the Round Trip Time:
Round Trip Time = Round Trip Time between MCU-RCU x 2
+ Initial Copy response time (ms)
1. Data transfer between the MCU and RCU involves two response sequences per command issued. Therefore, you must double the
Round Trip Time between the MCU and RCU.
For the Round Trip Time between the MCU and RCU, contact your carrier or use the ping command and
so on to measure the time. If you do not use lines and so on between the MCU and RCU, specify 1.
Initial copy response time is the response time required for multiple initial copy operations. Use the
following formula to calculate the initial copy response time. To obtain the time, use the following values:
• Initial copy pace
• Maximum number of initial copy VOLs
• Speed of the line between the MCU and RCU
• Number of lines
Initial Copy response time (ms) = (1[MB] / "Speed of line between MCU-RCU[MB/ms]
1. When you connect the MCU and RCU without lines and so on, specify 0.17[MB/ms] in "Speed of line between MCU and
RCU."
2. For "initial copy pace" in the formula, see Table 23.
3. For maximum number of initial copy volumes, see
4. Even if "Max number of initial copy VOLs" / "Number of lines between MCU-RCU" is larger than 16, specify "Max number of
initial copy VOLs" / "Number of lines between MCU-RCU" as 16.
Table 23

Initial copy pace for calculating initial copy response time

Operation RAID Manager
Command View XP
or XP Remote Web
Console
Table 24 Example settings
Item Round trip Line speed
No. time [ms] between
MCU/RCU
[MB/ms]
1 0 0.1
2 30 0.1
3 100 0.1

Registering RCUs to the connected MCU

1. Ensure that remote copy connections and MCU ports are properly configured. Get the S/N of the RCU
and the SSIDs for the CU image in the RCU. The register RCU operation fails without this information.
The disk array should have a label or tag indicating its S/N and SSIDs. The HP representative can also
get the RCU S/N and SSIDs using the RCU's service processor (at the remote site).
x ("initial copy pace"
x ("max number of initial copy VOLs
lines between MCU-RCU"
"Changing subsystem
Perform initial Perform initial copy and update copy at one time
copy only
Initial copy pace
specified at time of pair
creation is 1 to 8
Initial copy pace Initial copy pace specified
specified when pair when pair was created
was created
Initial copy pace Initial copy pace specified
specified when pair when pair was created
was created
Number of Initial copy
lines between pace
MCU/RCU
4 15
4 15
4 15
Continuous Access XP user guide for the XP12000/XP10000
1
2
/ 15)
3
" / "Number of
4
)
settings" on page 61. The default is 64.
Initial copy pace
specified at time of pair
creation 9 to 15
8
8
Maximum Round trip time
number of initial specified [ms]
copy VOLs
64 160
64 220
64 360
1
")
69