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тАО03-29-2007 02:39 AM
тАО03-29-2007 02:39 AM
My customer wants to remove the two VAXes from their 4 node cluster leaving two Alpha's. Votes, expected votes and a quorum disk will be adjusted/configured. The "quirk" (to me) is all 4 systems have an FDDI connection through some sort of FDDI hub/switch I suppose. Is there anything to be done on said hub/switch when the VAX FDDI cables are removed? Any kind of terminator or such on open interfaces required? Maybe just rubber plugs so some unsuspecting operator isn't "blinded by the light"?
The other curious display I see is in SHOW CLUSTER (see attached). It says the Alpha's have a PMA0 circuit. Memory Channel? Or did FDDI just use the same driver? VMS v7.1-1H1 ;-(
Cheers,
Art
Solved! Go to Solution.
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тАО03-29-2007 02:53 AM
тАО03-29-2007 02:53 AM
Re: Remove VAXes from Cluster and FDDI
Yes, it appears your Alpha systems do have MC. You'll probably see it enabled via the MC_SERVICES_P2 parameter.
If the Alpha systems can be retrofit with GbE, I'd be tempted to remove FDDI entirely. And given they likely have 100Mb and they do apparently have MC, I'd probably remove FDDI.
FDDI is usually wired as a pair of rings, and daisy-chained around all the controllers. As for the FDDI cabling, you'll be capping off the disconnected FDDI controllers (with boots), and re-organizing the FDDI rings to include just those systems you want to remain in the ring. If you are using FDDI at all. Or you can conceivably split the rings into two.
Also remember the SET NOINTERFACE and SET CONFIG NOINTERFACE and the equivalent NCP or NCL commands for whichever DECnet is in use, if any.
Stephen Hoffman
HoffmanLabs
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тАО03-29-2007 03:17 AM
тАО03-29-2007 03:17 AM
Re: Remove VAXes from Cluster and FDDI
Any other way of determining if MC really is there? It's 3000 km away so I can't just "have a look".
I have 0 exp w/FDDI, I have less than that on MC! ;-)
Thanks,
Art
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тАО03-29-2007 04:00 AM
тАО03-29-2007 04:00 AM
Re: Remove VAXes from Cluster and FDDI
Memory channel isn't a LAN device. $SHOW DEVICE MC. Does CLUE CONFIG exist under SDA at that old version of VMS?
Bill
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тАО03-29-2007 04:12 AM
тАО03-29-2007 04:12 AM
Re: Remove VAXes from Cluster and FDDI
Yes CLUE CONFIG exists in 71-1h1 ... see attached.
Art
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тАО03-29-2007 04:17 AM
тАО03-29-2007 04:17 AM
Re: Remove VAXes from Cluster and FDDI
$ SHOW DEVICE PM
$ SHOW DEVICE MC
Or check the parameter.
Or SDA> CLUE CONFIG
If you meant it as a circuit as in the DECnet context, then SHOW KNOWN CIRCUIT CHAR or such. (Though you can't boot over MC, most everything else can traverse MC. IIRC.)
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тАО03-29-2007 04:29 AM
тАО03-29-2007 04:29 AM
Re: Remove VAXes from Cluster and FDDI
http://h71000.www7.hp.com/wizard/wiz_4296.html
Depending on the vintage, SHOW DEVICE doesn't know the status of the MC device, and SDA does.
Yes, you have MC.
Your FDDI device is FW.
Most (but not all) Ethernet devices are E*, while FDDI was to be F*. There are some odd-ball devices -- stuff E* that wasn't Ethernet, or stuff that was not-E* that was Ethernet -- but that was the general prefix assignment theory.
If you are interested, you can contact me offline, and we can discuss the hardware and software in rather more detail, and one of us can post back a summary here. These little tiny text boxes really slow things down. IRC or email or such can be way faster...
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тАО03-29-2007 04:54 AM
тАО03-29-2007 04:54 AM
Re: Remove VAXes from Cluster and FDDI
Things I know: the Alpha's have ethernet, fddi and memory channel and the VAX's only have ethernet and fddi.
Things I think I know: in a VMS cluster, all members have to have a common communication path for SCS traffic.
Things I don't understand: how can MC be the "active" circuit (NUM_CON) displayed by SHOW CLUSTER? Why don't I see a reference to fddi in that display? One of the VAX's has been booted back into the cluster and the display has not changed.
Art
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тАО03-29-2007 05:15 AM
тАО03-29-2007 05:15 AM
SolutionYour proximity to the configuration allows you a better view into the connectivity.
>>> Things I think I know: in a VMS cluster, all members have to have a common communication path for SCS traffic.<<<
False.
Each node has to have a direct path to each other node, per the rule of total connectivity.
There is no requirement that there be just one path between nodes, nor is there any requirement to have one path common to all nodes.
Ethernet or FDDI makes meeting total connectivity easier, but four nodes can be wired with four point-to-point DSSI links or with two tri-node DSSI links, for instance.
The reason you likely have FDDI is because the VAX nodes did not -- at the time this configuration was implemented -- have fast Ethernet controllers available. Nemonix Engineering has provided 100 Mb NICs for certain of the older hardware, as stock DIGITAL networking gear for VAX systems was somewhat lacking in certain features.
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тАО03-29-2007 05:24 AM
тАО03-29-2007 05:24 AM
Re: Remove VAXes from Cluster and FDDI
The VAX nodes were participating via LAN, while the Alpha nodes were participating via LAN and MC. Whether or not FDDI was in use is not (yet) in evidence, nor whether this FDDI used a classic ring -- or a switch or concentrator. At this number of nodes, I'd tend to assume "ring".
As for circuits, SHOW CLUSTER/CONTINUOUS with the ADD CIRCUITS or other similar displays, or the various SCS commands available in more recent SDA implementations. Older SDA was adequate in its display capabilities, but Mr. SDA has gone quite gonzo adding stuff into SDA in newer releases.