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David J Dachtera wrote:
> To "break" the cluster, just disconnect something vital...
A big hammer can do the job. So would a huge magnet, jackhammers,
sandblaster directed at the cicuit boards, large cutters to snip all
cables coming in and out of the machine.
To take a node out of a cluster, you can:
MC SYSGEN
SYSGEN> USE CURRENT
SYSGEN> SET VAXCLUSTER = 0
SYSGEN> WRITE CURRENT
Then reboot, and the machine will be out of the cluster. If you do that
to all machines in the cluster, the cluster will no longer be active.
But setting the parameters back on will re-enable it
There are big caveats to this: If node B relies on access to drives
served by node A, then node B will fail because it will no longer have
access to A's drives.
If there are drives that are shared at the hardware level (shared SCSI
for instance), then there will not be any lock coordination between
drives and you will get corruption in files if both nodes try to access
the file at the same time.
Also note that a node may rely on another node's system disk to boot. (a
satellite node), and when you take that node out of the cluster. If so,
you need to change the nodes's default boot device to its own local
disk, as well as ensuring that its onw local disk has its own copy of
VMS (and this entails copying all configuration files from that node's
SYS$SPECIFIC tree from the server's disk to the node's own disk so when
it boots "alone", it can see all its own files.
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