10-01-2009
Any help please!!!! I'm dead here! Thanks.
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LEARN ABOUT MOJAVE
lamshrink
LAMSHRINK(1) LAM COMMANDS LAMSHRINK(1)
NAME
lamshrink - Shrink a LAM universe.
SYNOPSIS
lamshrink [-dhv] [-w delay] nodeid
OPTIONS
-d Print detailed debugging information.
-h Print useful information on this command.
-v Be verbose.
-w delay Notify processes on the doomed node and pause for delay seconds before proceeding.
nodeid Remove the LAM node with this ID.
DESCRIPTION
An existing LAM session, initiated by lamboot(1), can be shrunk to include less nodes with lamshrink. One node is removed for each invoca-
tion. At a minimum, the node ID is given on the command line. Once lamshrink completes, the node ID is invalid across the remaining nodes
(as can be seen by running lamnodes(1)).
Existing application processes on the target node can be warned of impending shutdown with the -w option. A LAM signal (SIGFUSE) will be
sent to these processes and lamshrink will then pause for the given number of seconds before proceeding with removing the node. By de-
fault, SIGFUSE is ignored. A different handler can be installed with ksignal(2).
All application processes on all remaining nodes are always informed of the death of a node. This is also done with a signal (SIGSHRINK),
which by default causes a process's runtime route cache to be flushed (to remove any cached information on the dead node). If this signal
is re-vectored for the purpose of fault tolerance, the old handler should be called at the beginning of the new handler. The signal does
not, by itself, give the process information on which node has been removed. One technique for getting this information is to query the
router for information on all relevant nodes using getroute(2). The dead node will cause this routine to return an error.
FAULT TOLERANCE
If enabled with lamboot(1), LAM will watch for nodes that fail. The procedure for removing a node that has failed is the same as lamshrink
after the warning step. In particular, the SIGSHRINK signal is delivered.
EXAMPLES
lamshrink -v n1 Remove LAM on n1. Report about important steps as
they are done.
lamshrink n30 -w 10
Inform all processes on LAM node 30, that the node will be dead in 10 seconds. Wait 10 seconds and remove the node. Operate silently.
SEE ALSO
lamboot(1), lamnodes(1), ksignal(2), getroute(2)
LAM 7.1.4 July, 2007 LAMSHRINK(1)