HP XP P9500 Storage - Manual (Page 51)

10. Path Gr. ID appears only when CU Free is selected. The field identifies groups of logical paths
that you set up.
To enter an ID, clear the Default checkbox and type the value, which can range from 0 (default)
to 255 (0 to FF in hexadecimal).
11. In the MCU-RCU Path box, define the logical path between local and remote systems. You can
define a maximum of eight logical paths to an RCU.
a.
In the MCU Port column, select a local system initiator port, which you previously set up.
b. In the RCU Port column, select the remote system RCU target port, also previously set up.
This establishes a logical path between the ports.
You can abbreviate the number to two characters. For example, “1A” can be entered instead
of “CL1-A”. Letters can be uppercase or lowercase.
12. Click Option. The RCU Option dialog box displays.
13. In the Minimum Paths box, enter the minimum number of paths necessary for operations to
continue. If the number of paths in Normal status falls below the Minimum Paths value you
set, the primary system splits Continuous Access Synchronous pairs. This is done to prevent a
performance drop on the host because of low overall bandwidth between primary and
secondary system. The default is 1.
•
If your pairs contain critical data and you are using Continuous Access Synchronous for
disaster recovery, set the minimum number to one. This ensures that Continuous Access
Synchronous operations continue even when there is only one remaining data path.
•
If performance is a higher priority than maintaining critical data, set the minimum number
of paths to two or more (up to eight per CU).
NOTE: If the pair is split because the number of paths has dropped below the Minimum
Paths setting, the P-VOL fence level determines whether write operations continue or are rejected
to the P-VOL.
14. In the RIO MIH Time (sec.) (Remote I/O Missing Interrupt Handler Time) box, enter the amount
of time that can pass before the system stops the copy operation as failed. The range of time
is from 10 seconds to 100 seconds. The default is 15 seconds.
15. In the Round Trip Time (ms) box, set a time limit in milliseconds for data to travel from the
P-VOL to the S-VOL. This value is used by the system to control initial copy pace when update
copying is in progress.
Configuring storage systems, defining logical paths 51