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I don´t want see system disc between cluster nodes

 
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Edgar Ulloa
Frequent Advisor

I don´t want see system disc between cluster nodes

Hi
I have a cluster ovms 8.3 integrity with eva.

when I acces to node 1, I be able to see the operating system for node 2 and viceversa.

Do you know wich params a need modify for each node only be able to see the owner operating system?

thanks
10 REPLIES 10
Steven Schweda
Honored Contributor
Solution

Re: I don´t want see system disc between cluster nodes

> [...] see the operating system [...]

Do you mean "see the (MSCP-served) system
disk" of another system?

mcr sysgen show mscp_serve_all

mcr sysgen help SYS_PARAMETERS MSCP_SERVE_ALL

Look for "Bit 2".


Why is this a problem?
Robert Gezelter
Honored Contributor

Re: I don´t want see system disc between cluster nodes

Edgar,

By "see", do you mean the actual device, or the device being mounted. There is a difference.

It is common for the device to be visible, but not generally mounted on other nodes. For non-privileged users, this effectively makes the device inaccessible. Management-level users are a completely different subject.

- Bob Gezelter, http://www.rlgsc.com
John Gillings
Honored Contributor

Re: I don´t want see system disc between cluster nodes

Edgar,

My assumption... You have two (or more) system disks in your cluster, and you want all nodes to be able to see them all.

By default, system disks are mounted /SYSTEM (not /CLUSTER) when the system boots. In a single system disk cluster, all nodes see it because they all mount it individually, as they boot.

So, you will need to mount the "other" system disk on each of your systems - I'd suggest using /CLUSTER. You should probably also remount the system disk on each node /CLUSTER during startup, otherwise you have timing issues.

A few things, before mounting the disk, make sure it exists, and skip the mount if it's already been mounted:

$ IF F$GETDVI(disk,"EXISTS")
$ THEN
$ IF .NOT.F$GETDVI(disk,"MNT)
$ THEN
$ WRITE SYS$OUTPUT "Mounting ''disk'"
$ MOUNT/CLUSTER 'disk' label
$ ENDIF
$ ENDIF

For the local system disk, mount it unconditionally:

$ MOUNT/CLUSTER 'F$TRNLNM("SYS$SYSDEVICE")' 'F$GETDVI("SYS$SYSDEVICE","VOLNAM")'

This is generic code which should work on all OpenVMS systems. It's quite safe to execute it at any time.

So, the MOUNT command for the "other" system disk will mount it on nodes which boot after all the nodes which boot from that disk. The MOUNT command for the "own" system disk will mount it on nodes which were booted before the booting node.

Note that multiple system disks are not very well supported by OpenVMS, there are many pitfalls if you've never configured one before. It's a good idea to engage the services of someone with prior experience. Unfortunately there are several misconfigurations which aren't revealed until they blow up in your face.
A crucible of informative mistakes
John Gillings
Honored Contributor

Re: I don´t want see system disc between cluster nodes

Edgar,

Oops, got that the wrong way around! If you CAN see the other system disk, then your startup must be explicitly mounting it. Look through your startup procedures and remove the extra MOUNT commands for the other system disks.

If you're on a single system disk, then you have no choice. All nodes which boot from the same disk, must (obviously) be able to see what's on that disk. That includes the system roots for any other nodes on the disk. There's no way you can block access to the other roots.
A crucible of informative mistakes
Steven Schweda
Honored Contributor

Re: I don´t want see system disc between cluster nodes

> Do you mean [...]?

> By "see", do you mean [...][?]

> My assumption... [...]

> Oops, got that the wrong way around! [...]

In case you haven't noticed, no one can
reliably determine exactly what you are able
to see, or exactly what you want to be able
to see, or exactly how these systems are
configured, or much else. As usual, showing
actual commands with their actual output can
be more helpful than vague descriptions or
interpretations.
Bhadresh
Trusted Contributor

Re: I don´t want see system disc between cluster nodes

>>>Do you know wich params a need modify for each node only be able to see the owner operating system?

mount/cluster - mount clusterwide
mount/system - mount systemwide

To know more about commands have a look at the VMS help of mount command.

Regards,
Bhadresh
Steven Schweda
Honored Contributor

Re: I don´t want see system disc between cluster nodes

> mount/cluster - mount clusterwide
> mount/system - mount systemwide

Yeah, except that the user typically doesn't
explicitly mount his system disk. Also, as
I interpreted the original question, the
complaint might have involved seeing the disk
device, not necessarily the files thereon.

Of course, the original question was so
unclear that it's hard to know exactly what
was sought.
Edgar Ulloa
Frequent Advisor

Re: I don´t want see system disc between cluster nodes

Thanks a lot

Your knowlodge help to me to solve this concern.


Regards
Bhadresh
Trusted Contributor

Re: I don´t want see system disc between cluster nodes

>>> Thanks a lot

Refer the following link which says how you can thank the forum -
http://forums13.itrc.hp.com/service/forums/helptips.do?#28

Regards,
Bhadresh
Steven Schweda
Honored Contributor

Re: I don´t want see system disc between cluster nodes

> Your knowlodge help to me to solve this
> concern.

Some future reader might benefit from an
explanation of what you did to solve the
problem. (So far, no one is sure what either
the problem or the solution was.)