9.5.1 Considerations that apply to configuring systems

Organization of this subsection
(1) Setting system definitions
(2) Setting the high-speed connection facility
(3) Setting the standby-less system switchover (effects distributed) facility

(1) Setting system definitions

When you configure a system with many units or servers, you must reduce the communications load by locking the ports that HiRDB uses. To do this, specify the system definition operands shown in the table below.

Table 9-7 Operands that must be specified to reduce the communications load

No.OperandDescription
1pd_name_fixed_port_lookup=YSpecify Y for this operand and use the unit's own shared memory information so that it communicates with other units. Also specify the operands shown in No. 2.
2
  • pd_mlg_port or the pdunit -m option
  • pd_alv_port or the pdunit -a option
  • pd_trn_port or the pdunit -t option
  • pd_scd_port or the pdunit -s option
  • pd_name_port or the pdunit -p option
--
3pd_ipc_conn_nblock_timeWhen HiRDB is performing communication between servers and there is a server that is not running, the next operation is pended by the amount of time specified in this operand. For that reason, specifying too high a value for this operand might cause performance to decline.
In systems without a high network load, specify 2 (seconds) for this operand.
In systems with a high network load, do one of the following.
  • Determine the value for this operand according to the network environment.
  • Consider modifying or upgrading your network environment.
4pd_bes_connection_hold=YNo particular specification.
5pd_bes_conn_hold_trn_intervalIf the UAP connection time (from SQL CONNECT to DISCONNECT) is short, specify 0 for this operand.
Legend:
--: Not applicable

(2) Setting the high-speed connection facility

Use the high-speed connection facility to reduce the communication load. For details about the high-speed connection facility, see the HiRDB Version 9 UAP Development Guide.

(3) Setting the standby-less system switchover (effects distributed) facility

The maximum number of units that can be defined for a single HA group is 32. So if the number of units is 33 or more, define multiple HA groups. For details about the standby-less system switchover (effects distributed) facility, see the HiRDB Version 9 System Operation Guide.