About GAB load-time or static tunable parameters

Table: GAB static tunable parameters lists the static tunable parameters in GAB that are used during module load time. Use the gabconfig -e command to list all such GAB tunable parameters.

You can modify these tunable parameters only by adding new values in the GAB configuration file. The changes take effect only on reboot or on reload of the GAB module.

Table: GAB static tunable parameters

GAB parameter

Description

Values (default and range)

gab_numnids

Maximum number of nodes in the cluster

Default: 64

Range: 1-64

gab_numports

Maximum number of ports in the cluster

Default: 32

Range: 1-32

gab_flowctrl

Number of pending messages in GAB queues (send or receive) before GAB hits flow control.

This can be overwritten while cluster is up and running with the gabconfig -Q option. Use the gabconfig command to control value of this tunable.

Default: 128

Range: 1-1024

gab_logbufsize

GAB internal log buffer size in bytes

Default: 48100

Range: 8100-65400

gab_msglogsize

Maximum messages in internal message log

Default: 256

Range: 128-4096

gab_isolate_time

Maximum time to wait for isolated client

Can be overridden at runtime

See About GAB run-time or dynamic tunable parameters.

Default: 120000 msec (2 minutes)

Range: 160000-240000 (in msec)

gab_kill_ntries

Number of times to attempt to kill client

Can be overridden at runtime

See About GAB run-time or dynamic tunable parameters.

Default: 5

Range: 3-10

gab_conn_wait

Maximum number of wait periods (as defined in the stable timeout parameter) before GAB disconnects the node from the cluster during cluster reconfiguration

Default: 12

Range: 1-256

gab_ibuf_count

Determines whether the GAB logging daemon is enabled or disabled

The GAB logging daemon is enabled by default. To disable, change the value of gab_ibuf_count to 0.

The disable login to the gab daemon while cluster is up and running with the gabconfig -K option. Use the gabconfig command to control value of this tunable.

Default: 8

Range: 0-32

gab_timer_pri

Priority of GAB timer thread on AIX

Default: 17

Range: 2-60