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SET LINK
The new value for
secs
becomes effective only after a time of about one third of
the current value of the link inactivity timeout.
The minimum useful value for
secs
is three. If a value is not specified, links
inherit the current value of the node inactivity timeout. (See SET NODE
/INACTIVITY_TIMEOUT.)
You can check the current value of the link inactivity timeout with the command
SHOW LINK linkname/COUNTER=ndb_lw_inact
.
You should not specify a value of less than five times the time required for a
round trip over the link. If you don’t know this value, RTR can measure it
for you. Make sure that there is no transactional traffic over the link, and
monitor the link (with the MONITOR LINK command) between the two nodes
whose round trip time you want to measure. After a few minutes, look at
the link counters
ndb_lw_trips
and
ndb_lw_trips_ms
using the SHOW LINK
/COUNTER=ndb_lw_trips* command. Dividing the latter by the former yields
the average round trip time in milliseconds.
Note
The inactivity timeout is used for all RTR links, but the effect of a timeout
and failover depends on what connections the link is supporting. In brief,
a link between a router and a backend timing out causes a router or
backend failover and quorum re-negotiations. A frontend will search for
another router.
/NODE[=node-list]
/NODE=default-node-list (D)
Specifies that the command is executed on all nodes specified in
node-list
.If
node-list
is omitted then the command is executed only on the node where the
command was issued.
/OUTPUT[=file-spec]
/OUTPUT=stdout (D)
Specifies that the resulting information is written to the file
file-spec
.If
/OUTPUT
or
file-spec
is omitted then the standard or default output is used.
/SUSPECT
/NOSUSPECT
Obsolete. Available for compatibility reasons only, use
/AUTOISOLATE
instead.
Related Commands
•
SET NODE/AUTOISOLATE
•
SHOW LINK/STATUS
6–114 RTR Command Line Interface