Installing the truecopy hardware – HP StorageWorks XP Remote Web Console Software User Manual
Page 47
47
•
All TC390A pairs must be assigned to one and only one consistency group.
•
The maximum number of volume pairs in one consistency group is 4,096 (entire RCU).
•
The maximum number of consistency groups established for one MCU-RCU pair is 128. The RCU
supports a maximum of 128 groups. This limit of 128 groups includes both TC390A groups and TC
Asynchronous groups (for example, 64 TC390A + 64 CA Asynchronous).
•
Each update I/O to the M-VOLs in one consistency group must be time-stamped using a common timer
facility. The primary host system cannot access volume pairs of the same consistency group if the pairs
do not have a common timer reference.
•
A consistency group must consist of TC390A pairs or CA Asynchronous pairs, but not both.
•
Only TC390A pairs that belong to the same CLPR can be allocated to one consistency group. For
further information on CLPR, please refer to the HP StorageWorks Command View XP User Guide for
XP Disk Arrays or the HP StorageWorks XP Remote Web Console User Guide for the specific disk array.
Installing the TrueCopy Hardware
Initial installation of the TC390 hardware is planned and performed by the user and the HP representative.
To install the hardware required for TC390 operations:
1.
User: Identify the TC390 M-VOLs and R-VOLs (main and remote volumes) so that the TC390 hardware
can be installed and configured properly.
2.
User: On the host operating system, verify that the missing interrupt handler (MIH) value (also called
host I/O patrol time) is set high enough to accommodate the number of volume pairs, the cable length
between the MCUs and RCUs, and the initial copy pace. The recommended MIH value for TC390
operations is 60 seconds. For MVS, the MIH value is specified in the SYS1.PARMLIB file.
NOTE:
The recommended MIH value for HXRC is different than for TC390. If you are performing
TC390 and HXRC on the same XP128/XP1024/XP10000/XP12000 (or other XP disk arrays) at
the same time, contact your HP account support representative for assistance.
3.
User and HP Representative: Install the Command View XP management station near the TC390
MCU(s) and connect the Command View XP management station to the TC390 MCU(s) through the
LAN. HP recommends that you also install a Command View XP management station connected to the
RCUs at the remote site.
4.
HP Representative: Enable TC390 on all MCUs and RCUs. Verify that the cache, NVS, and DFW of the
MCUs and RCUs are properly configured for TC390 operations. See ”
” on page 47. If the user plans to perform TC390A and/or HXRC operations in the same disk
array, make sure to install adequate cache to handle the increased sidefile usage. When determining
the required amount of cache, you must also consider the amount of Cache LUN XP data to be stored
in cache.
5.
HP Representative: Verify that the necessary SVP modes are enabled. See
6.
HP Representative: Verify the MCUs are configured to report sense information to the host(s). The RCUs
should also be attached to a host processor to enable reporting of sense information in case of a
problem with an R-VOL or RCU. If the remote site is unattended, the RCUs should be attached to a host
processor at the main site so that the system administrator can monitor the operational condition of the
RCUs.
7.
HP Representative: For serial interface connections, install the serial port adapter features. For example,
the DKC-F410I-8S serial 8-port adapter (pair of 4-port CHE cards, 1 card per cluster) provides eight
ESCON links. If the MCU and RCU are multiplatform disk arrays, there may be available serial
interfaces and additional serial port adapter features may not be required. For Fibre Channel interface
connections, install the Fibre Channel adapter features (CHF P/K (WP411-B).
8.
HP Representative: If the user plans to use the Local TC390A timer type option, set the SVP clock to
local time so that the TC390A timestamps will be correct.
9.
HP Representative: Install the TC390 remote copy connections between the MCU(s) and RCU(s). This
hardware (ESCON cables, ESCON directors, optical fibre cables, switches, and so forth) is supplied by
the user. For remote copy configurations, see ”
Serial Remote Copy Connections
Distribute the paths between different storage clusters and ESCDs or switches to provide maximum