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OpenVMS Hobbyist Program | Alpha Systems Forums | Alpha Hardware Forum
Author What hardware I need to setup a quorum disk?

Posts: 28
Location: Sofia, Bulgaria
Joined: 02.01.06
Posted on June 10 2007 22:48
Two days ago I configured my two alphas at home in LAN cluster and works fine. But I would be happy to have a quorum disk. I think I will manage to configure it (openvms docs are good) but first I need to set it up in hardware.
The setup is as follows:
PWS600a with added NCR53810 from one side
AS1200 with Mylex DAC960 (KZPSC) and inetrnal NCR53810.

What I tried up to the moment is to connect one HDD to the NCR on the Alpha and on the other side - to the KZPSC. In that config the disk is seen from both machines. I reconfigured the KZPSC with the RCU and added it. But when both machines are up the KZPSC has problems with the shared drive - takes too long to initialize the RCU, problems with formatting (took 2 hours for 2G drive?!) ...
In the other way (NCR - disk - NCR) AS does not sees the drive at all (in all scenarios I power up first PWS and then AS).

I decided to stop trying before I damage the hardware and ask - is it possible with the current hardware to set up a quorum (shared on SCSI bus) disk? Of course I know that probably nobody has the same config to say definetly yes or no, but any comments and success/failure stories are welcome.

And what hardware do I need for cluster over SCSI? For that probably I need devices that support both initiator and target mode? Which host controllers are OK for that?

P.S. actually I found this table:
But I anticipated more hardware to be supported...

Vesselin Kenashkov
109218396 http://azonmedia.com

User Avatar

Posts: 277
Location: UK
Joined: 24.02.06
Posted on June 11 2007 00:07
Ensure that your two alphas have different SCSI id. Check the pk*host_id environment variable at the consoles.

Ensure the termination is correct. If the scsi card you are using does not have an internal bus terminator (often can been seen as a line of resistors on the card) then you need to add termination using a Y connector.

Posts: 28
Location: Sofia, Bulgaria
Joined: 02.01.06
Posted on June 11 2007 01:38
Ahh - I checked that the ID of the drive is free for both controllers, but I forgot that the two controllers may have same ID themselves :lol:
So basically there is no specific requirement for the controller, just to ensure termination & IDs.
Thanks smiley
109218396 http://azonmedia.com
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