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The 2 instances boot ok now.<br>
<br>
Thanks to all again.<br>
<br>
Patrick.<br>
<br>
Le 20/10/2011 22:55, Matt a écrit :
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On 20/10/2011 19:16, Boucher, François wrote:
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<title>VMS Cluster boot on an unique container </title>
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<p><font size="2">Hi!<br>
<br>
I never succeeded to operate a cluster of machines that
attaches directly<br>
to the same disk drives file images, when a first node
writes to the system<br>
disk, the other node was not aware of the changes and it
ended up in a filesystem<br>
corruption. Perhaps I did not found the correct way to
create/configure some sort of<br>
dual-port scsi devices?</font><br>
</p>
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The trick is to make sure that all nodes have the same ALLOCLASS
parameter. This will cause there to be multiple devices in the
cluster with the same full name (e.g. $1$DUA0) so VMS will assume
they are the same physical device and the lock manager will take
care of concurrent access. The only catch is that _every_ disk
device that has the same name between two nodes is assumed to be
the same physical device. If you attach them to different
containers on the host side then you will get strange results and
probably data corruption.<br>
<br>
To boot the secondary nodes with Simh use the R5 parameter to
specify an alternative system root:<br>
<br>
sim> boot rq0 /r5:10000000<br>
<br>
to boot from SYS1.<br>
<br>
Matt<br>
<br>
<br>
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