The basement Vax Cluster consists of six (6) Vax computers.
You can check their names and status by logging in on any of them and
using the "show cluster" command.
The six computers are the following:
A majority of computers with boot disks must be running and online,
or the entire cluster will "hang".
This means that at least any two out of MVG, FELIX and MVC must be running
or the remaining computers will all freeze up.
The frozen computers will resume normal activity when quorum is restored.
In a practical sense, a cluster simply means that these computers can
mount disks that are connected to any other cluster member, and treat
them as local disks. Do a "show dev dk" and "show dev du" to
check what disks are normally mounted on any node.
The normal order for booting is sometimes disrupted, and disks may not
get mounted properly.
In that case, you should mount the errant disk by logging in as
system and:
Note that not all disks are normally mounted on each computer.
For example, mvg$dka200: and mvg$dka400: are not mounted on any node, and
felix$dua0: is mounted only on Felix and MVG.
To check which disks are normally mounted on any node, check the
file sys$manager:systartup_v5.com on the node in question.
If you have questions or suggestions about this documentation,
please send them by e-mail to
kochhar@physiology.wisc.edu
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Name Location Boot disk?
---- -------- ----------
MVG 85 Y
MVH 290 N
MVC 81 Y
FELIX 81 Y
VS 83 N
SIM 20B N
Three of the computers have their own boot disk, while three
(VS, MVH and SIM) boot over the network from the MVG system disk.
$ dism vs$dka0:
$ mount/sys vs$dka0: vsdisk1
The above example shows how the disk vs$dka0: can be remounted on any of
the member nodes.
To determine the label (e.g. vsdisk1) for any disk, log-in on the
computer that the disk is actually a part of (e.g. VS in above example)
and use the "show dev dk" command.
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This page last modified on : Apr. 26, 2004