clusterstart, clusterstop(1t,C)                 clusterstart, clusterstop(1t,C)



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clusterstart, clusterstop



PURPOSE

clusterstart enables cluster communication.
clusterstop disables cluster communication.

SYNTAX


clusterstart ----|

clusterstop  ----|


DESCRIPTION

The clusterstart command enables TCF cluster communication and
telecommunications adapter (TCA) activity.  If cluster communication was
previously enabled, this program has no effect.  Conversely, clusterstop
disables TCF cluster communication.  If cluster communication was previously
enabled, the site on which clusterstop was run attempts to notify the other
sites that it is dropping off of the network.  If cluster communication was not
previously enabled, this program has no effect.

A system will not be able to communicate to any other machines until a
clusterstart is done, hence it is generally done before the site enters
multi-user state.  For a diskless system (one which does not have its own
copies of the root file systems), the clusterstart operation is done
automatically in the kernel.

Under AIX/370, the clusterstart command also enables TCA traffic but
clusterstop does not disable it.  This enables traffic so that AIX Access for
DOS (file service and terminal emulation) can communicate with AIX/370 over
a TCA line.  Therefore, AIX/370 systems that are not to participate in cluster
communication should do a clusterstart followed by an immediate clusterstop
before entering multi-user mode.

Under certain hardware failures (for instance, when a site can send data but
cannot not receive) part of a cluster may go into topchange and loop forever.
In this case, the user should take these sites off the cluster.  To do this,
the user needs to be at the console (it is not necessary to be logged in).  If
the site is a PS/2, press the <RIGHT_CTRL>, <ALT>, and <RIGHT_SHIFT> keys
simultaneously.  Then press the "?" key and the <ENTER> key twice.  On a 370,
type "<SHIFT>6" and then "5?<ENTER>".  The site will now be off the cluster and
can later join the cluster once the hardware problem has been solved.






Processed Feb. 27, 1992 clusterstart, clusterstop(1t,C)                       1






clusterstart, clusterstop(1t,C)                 clusterstart, clusterstop(1t,C)



DIAGNOSTICS

clusterstart and clusterstop will both issue a message indicating the previous
status of traffic.

RELATED INFORMATION

See the following command:  "probe."















































Processed Feb. 27, 1992 clusterstart, clusterstop(1t,C)                       2