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тАО01-24-2010 06:01 PM
тАО01-24-2010 06:01 PM
DCL quorum adjustment tool ?
We are losing local access to our console manager and ideally want to be able to SSH to it and adjust quorum, should the occasion arise.
Thanks.
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тАО01-24-2010 07:16 PM
тАО01-24-2010 07:16 PM
Re: DCL quorum adjustment tool ?
There can be no DCL tool.
When quorum is lost, all user-level activity is explicitly blocked. This includes DCL. This is a quorum hang.
But depending on the particular Alpha boxes involved, you can use the console and the IPL C (IPC) interrupt. And this means with access into the console via terminal server or such, you can do what you want.
As was discussed elsewhere recently, you can also VPN or otherwise connect into the Windows console box and use RDP or VNC to access the PC display.
Or run the console monitor on another OpenVMS box on the same LAN as the cluster, and toss the X display around to another local box, or to a local Mac OS X box, or to a Windows box with an X server installed.
The other discussion is to add a server or add a shared I/O bus or fix the cluster hardware or reconfigure the cluster so it operates more reliably.
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тАО01-24-2010 07:17 PM
тАО01-24-2010 07:17 PM
Re: DCL quorum adjustment tool ?
SET CLUSTER /EXPECTED_VOTES
if you have not lost quorum.
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тАО01-25-2010 03:10 AM
тАО01-25-2010 03:10 AM
Re: DCL quorum adjustment tool ?
Can you get an X-Server on your desk and redirect the AMDS window?
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тАО01-25-2010 05:19 PM
тАО01-25-2010 05:19 PM
Re: DCL quorum adjustment tool ?
We also think this would be a useful tool - as you can imagine speed would be of the essense when you know the situation and are trying to continue one side of a dual site vms cluster. We also would like to be able to login to one of our standalone VMS systems and run a quick tool to do the AMDS quorum fix without having to load a X GUI.
I once asked Barry about it and he said it would seem do-able, one would need to write something to interface with RMDRIVER like AMDS does. I'm suprised this hadn't come out of the DTCS support group - I think they had a winders-based tool that would just do this.
Perhaps we can take up a collection ($$) and see if anyone would take this on?
Thanks,
Dave
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тАО01-25-2010 09:03 PM
тАО01-25-2010 09:03 PM
Re: DCL quorum adjustment tool ?
You could also run Availability Manager (the current ilk of what was AMDS) on PC. This version of the tool can be configured, with care, to use intermediate nodes as collectors and the "analyzer" runs on PC.
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тАО01-26-2010 01:47 AM
тАО01-26-2010 01:47 AM
Re: DCL quorum adjustment tool ?
Wim
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тАО01-26-2010 08:45 AM
тАО01-26-2010 08:45 AM
Re: DCL quorum adjustment tool ?
The interface to RMDRIVER is not documented.
Purely Personal Opinion
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тАО01-26-2010 02:30 PM
тАО01-26-2010 02:30 PM
Re: DCL quorum adjustment tool ?
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тАО01-26-2010 08:48 PM
тАО01-26-2010 08:48 PM
Re: DCL quorum adjustment tool ?
Look at the latest version of Availability Manager.
$ prod show prod avail*
------------------------------------ ----------- ---------
PRODUCT KIT TYPE STATE
------------------------------------ ----------- ---------
HP AXPVMS AVAIL_MAN_ANA_SRVR V3.0-2 Full LP Installed
HP AXPVMS AVAIL_MAN_BASE V8.3 Full LP Installed
HP VMS AVAIL_MAN_COL V3.0-2A Full LP Installed
------------------------------------ ----------- ---------
You can run a server on a node (VMS or Windows) on the same subset as your cluster, and run a client on a PC anywhere else using certificate based authentication. You can adjust quorum from outside via the server. It also means you can have multiple clients.
Big improvement over AMDS and the older version of Availability Manager. Also far less load on the server if running OpenVMS.