HECnet

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15583 discussions

by HECNET＠beyondthepale.ie

I've now refreshed the VAX satellites system drive and installed it in the ALPHA server. The one problem I have remaining is that the VOTES the satellite is contributing to the cluster is 1. I believe for a proper satellite this should be 0. The number of votes a node has determines what happens to it when it loses contact with other members of the cluster. If each node in a two node cluster has one vote, then the cluster quorum is two votes. If something happens to either node, the other notices that quorum has been lost and will hang until quorum is reestablished. The reason for the hang is that all each node knows is that it can't see the other node. It doesn't know whether the other has shut down or is still running and might become visible again shortly, in which case, everything can resume. If your diskless satellite should die unexpectedly, it is somewhat irritating if it also ends up hanging the other node, for no good reason. If the satellite has lost contact with the node with the disks, then it can do nothing anyway. Hence the reason for recommending zero votes for diskless satellites. No other ill effects will result from leaving votes set to one. Whatever the number of votes each node has, when shutting down a voting member of the cluster, REMOVE_NODE should be specified in order to avoid hanging the rest of the cluster after the shutdown completes. This specifies that the remaining cluster nodes should recompute quorum taking into account the loss of the node being shut down. Regards. Peter Coghlan.

14 years, 1 month

More clustering fun

by hvlems＠zonnet.nl

Regarding the alphaserver: check the value of expectedvotes in sysgen. In a cluster with non-voting satellites only, its value must be less than Votes+1 Hans ------Origineel bericht------ Van: Mark Wickens Afzender: owner-hecnet at Update.UU.SE Aan: hecnet at Update.UU.SE Beantwoorden: hecnet at Update.UU.SE Onderwerp: [HECnet] More clustering fun Verzonden: 16 september 2011 10:14 I've now refreshed the VAX satellites system drive and installed it in the ALPHA server. The one problem I have remaining is that the VOTES the satellite is contributing to the cluster is 1. I believe for a proper satellite this should be 0. Is this a case of updating the MODPARAMS.DAT on the satellite and autogen and reboot? Do I need to do anything with the ALPHA servers configuration? Presumably I will need to reboot the ALPHA server as well. Thanks for the help, Kind regards, Mark.

14 years, 1 month

More clustering fun

by hvlems＠zonnet.nl

Correct. VOTES is not dynamic so you have two options: 1) Modify modparams.dat and run autogen with the reboot option 2) Modify modparams.dat Run sysgen to modify VOTES and write current Reboot There is a lazy third option: same as 2) but skip modifying modparams.dat. Which is sloppy work, to put it mildly. ------Origineel bericht------ Van: Mark Wickens Afzender: owner-hecnet at Update.UU.SE Aan: hecnet at Update.UU.SE Beantwoorden: hecnet at Update.UU.SE Onderwerp: [HECnet] More clustering fun Verzonden: 16 september 2011 10:14 I've now refreshed the VAX satellites system drive and installed it in the ALPHA server. The one problem I have remaining is that the VOTES the satellite is contributing to the cluster is 1. I believe for a proper satellite this should be 0. Is this a case of updating the MODPARAMS.DAT on the satellite and autogen and reboot? Do I need to do anything with the ALPHA servers configuration? Presumably I will need to reboot the ALPHA server as well. Thanks for the help, Kind regards, Mark.

14 years, 1 month

More clustering fun

by mark＠wickensonline.co.uk

I've now refreshed the VAX satellites system drive and installed it in the ALPHA server. The one problem I have remaining is that the VOTES the satellite is contributing to the cluster is 1. I believe for a proper satellite this should be 0. Is this a case of updating the MODPARAMS.DAT on the satellite and autogen and reboot? Do I need to do anything with the ALPHA servers configuration? Presumably I will need to reboot the ALPHA server as well. Thanks for the help, Kind regards, Mark.

14 years, 1 month

Satellite configuration/NCP crash

by hvlems＠zonnet.nl

I guess so, but remember that a scsi cluster was never possible with a VAX! The reason for the behaviour is that diskdata and clusterdata follow different paths in a scsi cluster. Which isn't possible on VAXes (I think). Then again it may be a bug in 8.3 of course! ------Origineel bericht------ Van: Peter Coghlan Afzender: owner-hecnet at Update.UU.SE Aan: hecnet at Update.UU.SE Beantwoorden: hecnet at Update.UU.SE Onderwerp: Re: [HECnet] Satellite configuration/NCP crash Verzonden: 16 september 2011 00:37 It should happen before disk access across the CI bus is even possible. I think we'll have to agree to disagree on this one :-) I've just booted my Vaxstation 2000 into an NI cluster with my Vaxstation 3100. I gave the commands: NCP SET CIRCUIT SVA-0 STATE OFF NCP SET CIRCUIT SVA-0 STATE ON on each node. The only effects were an opcom message complaining about adjacency down and the loss of my decnet connections. Both nodes continued to function quite happily while the circuit was off. No crash. Anyway, it looks like avoiding issueing the SET CIRCUIT STATE OFF command by making the changes to the permanent database and rebooting was a good way of sidestepping the problem. Hopefully the bug is only triggered when SET CIRCUIT STATE OFF is issued in Marks setup. Apologies to gerry77. I missed your reply earlier and ended up repeating much of what you said. Regards, Peter Coghlan.

14 years, 1 month

Another thought regarding dynamic bridge setup

by bqt＠softjar.se

On 2011-09-16 00:30, Mark Wickens wrote: Just thinking aloud, Can I run a bridge between the dongle based network and my own home network? If the bridge program on my network is wrapped with a script which checks the dyndns hostname periodically against the recorded IP address, cannot I not reconfigure the bridge on my home network and restart it if required? If this is possible it keeps my configuration in a realm I've got half a chance of working out myself and saves me from hassling anyone else. Presumably at home I would need to run two bridges on different ports - with the current bridge linking back to Johnny as normal. Short answer: yes. Johnny -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol

14 years, 1 month

Another thought regarding dynamic bridge setup

by jeep＠scshome.net

Mark, Forget the bridge. Run Multinet at the event and either connect to your end via Multinet (you are already running that), or connect to mine. Either way it will just work. I personally, would use the dedicated events area on the machines at the event and be done with it! I can either supply you with my code for your end, or you can connect to my end. Your choice. In the second scenerio, all I have to do is add one (1) entry in the existing database and off we go! -Steve -----Original Message----- From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On Behalf Of Mark Wickens Sent: Thursday, September 15, 2011 18:30 To: hecnet at Update.UU.SE Subject: [HECnet] Another thought regarding dynamic bridge setup Just thinking aloud, Can I run a bridge between the dongle based network and my own home network? If the bridge program on my network is wrapped with a script which checks the dyndns hostname periodically against the recorded IP address, cannot I not reconfigure the bridge on my home network and restart it if required? If this is possible it keeps my configuration in a realm I've got half a chance of working out myself and saves me from hassling anyone else. Presumably at home I would need to run two bridges on different ports - with the current bridge linking back to Johnny as normal. Regards, Mark

14 years, 1 month

Satellite configuration/NCP crash

by HECNET＠beyondthepale.ie

It should happen before disk access across the CI bus is even possible. I think we'll have to agree to disagree on this one :-) I've just booted my Vaxstation 2000 into an NI cluster with my Vaxstation 3100. I gave the commands: NCP SET CIRCUIT SVA-0 STATE OFF NCP SET CIRCUIT SVA-0 STATE ON on each node. The only effects were an opcom message complaining about adjacency down and the loss of my decnet connections. Both nodes continued to function quite happily while the circuit was off. No crash. Anyway, it looks like avoiding issueing the SET CIRCUIT STATE OFF command by making the changes to the permanent database and rebooting was a good way of sidestepping the problem. Hopefully the bug is only triggered when SET CIRCUIT STATE OFF is issued in Marks setup. Apologies to gerry77. I missed your reply earlier and ended up repeating much of what you said. Regards, Peter Coghlan.

14 years, 1 month

Alternatives to bridge when running via a dynamic IP address

by jeep＠scshome.net

Actually, who cares. All of this happens at this end. I can tell this end to do the lookup every second if I wish. In reality it is usually done in some number of minutes. As for the reboot, that's why it is a dedicated machine. It can reboot as often as it needs to - I don't depend on it except to provide connectivity to this site from remote sites that have dynamic IP addresses. The actual reboot is only a few minutes. This entire process is automated and it is able to inform via email (delayed using NMAIL) anyone necessary that their was a change in state (address). -Steve -----Original Message----- From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On Behalf Of Johnny Billquist Sent: Thursday, September 15, 2011 17:46 To: hecnet at Update.UU.SE Subject: Re: [HECnet] Alternatives to bridge when running via a dynamic IP address The question is how long does it take to detect, and is a reboot every time acceptable? Johnny On 2011-09-15 23:40, Steve Davidson wrote: This issue has been dealt with here. The declab.net site runs a dedicated VAX with Multinet that polls the other end at predetermined intervals. When the other ends' address changes this end makes change to the Multinet database and reboots. This software has been in use for well over a year and appears to work very well. It does require the use of DynDNS at the end that changes addresses so that this end can do the lookup. -Steve -----Original Message----- From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On Behalf Of Mark Wickens Sent: Thursday, September 15, 2011 17:14 To: hecnet at Update.UU.SE Subject: Re: [HECnet] Alternatives to bridge when running via a dynamic IP address On 15/09/11 22:03, hvlems at zonnet.nl wrote: Won't the IP address remain unchanged as long as you keep the router up and running? Or would thet be too costly? ------Origineel bericht------ Van: Mark Wickens Afzender: owner-hecnet at Update.UU.SE Aan: hecnet at Update.UU.SE Beantwoorden: hecnet at Update.UU.SE Onderwerp: [HECnet] Alternatives to bridge when running via a dynamic IP address Verzonden: 15 september 2011 22:53 Guys, Might as well explore this as an option. The 3G network enabled Vigor 2800 router that I will be using at the DEC Legacy event appears to be working reasonably well, but unsurprisingly there does appear to be some fluctuation in the IP address. This means that an alternative to Johnny's bridge program might be called for. I have a dynamic DNS reference set up and now updating periodically, hecnet.no-ip.org, the question is what can I use as an alternative to the bridge program which will cope with IP address changes? I seem to remember Multinet tunnels being mentioned in the past, do they support dnydns, or any other technology? Thanks for the help, Mark. Unfortunately not. I've seen three IP address changes in about the same number of hours. I don't know whether this poor performance is down to the completely haphazard location of the dongle, or whether it's always this rubbish but you don't realise when all you're doing is browsing the internet. My experience of using a 3G dongle for anything other than web browsing is very limited! Regards Mark. -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol

14 years, 1 month

Another thought regarding dynamic bridge setup

by mark＠wickensonline.co.uk

Just thinking aloud, Can I run a bridge between the dongle based network and my own home network? If the bridge program on my network is wrapped with a script which checks the dyndns hostname periodically against the recorded IP address, cannot I not reconfigure the bridge on my home network and restart it if required? If this is possible it keeps my configuration in a realm I've got half a chance of working out myself and saves me from hassling anyone else. Presumably at home I would need to run two bridges on different ports - with the current bridge linking back to Johnny as normal. Regards, Mark

14 years, 1 month

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