Veritas Storage Foundation 5.1 SP1 for Oracle RAC Administrator"s Guide (5900-1512, April 2011)

Table 5-2
GAB dynamic tunable parameters (continued)
Description and commandGAB parameter
Default: Disabled
If this option is enabled then the system will panic on missing the first
heartbeat from the VCS engine or the vxconfigd daemon in a CVM
environment. The default option is to disable the immediate panic.
This GAB option controls whether GAB can panic the node or not when
the VCS engine or the vxconfigd daemon miss to heartbeat with GAB.
If the VCS engine experiences a hang and is unable to heartbeat with
GAB, then GAB will NOT PANIC the system immediately. GAB will
first try to abort the process by sending SIGABRT (kill_ntries - default
value 5 times) times after an interval of "iofence_timeout" (default
value 15 seconds). If this fails, then GAB will wait for the "isolate
timeout" period which is controlled by a global tunable called
isolate_time (default value 2 minutes). If the process is still alive, then
GAB will PANIC the system.
If this option is enabled GAB will immediately HALT the system in
case of missed heartbeat from client.
Use the following command to enable system halt when process
heartbeat fails:
gabconfig -b
Use the following command to disable system halt when process
heartbeat fails:
gabconfig -B
Missed heartbeat
halt
Tunable parameters
About GAB tunable parameters
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