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Re: [Linux-cluster] A few GFS newbie questions: journals, etc



On Thu, 30 Jun 2005, Patrick Caulfield wrote:
That is right. What you have here is cman correcting an incorrect configuration. You've told it to expect only 10 votes but provided it with 101 votes. It knows when you're lying to it ;-)

But darn it, I *want* to be able to lie to it! :)

What you actually have here is a special case of a two-node cluster, because there are only two "real" nodes involved. Unfortunately the cman "two_node" mode is no use here because it enforces the 2-node restriction which would prevent you bringing any VMs online once the two real machines were up.

I've only got two physical boxes right now, but will be adding 2 more in the near future (once I migrate all the services off the boxes in my old colo to the new one.)


One little-known feature is that you can set votes to zero (only in CCS, not from the cman_tool command-line) which may go a little way to helping out. it would, at least, work for 3 or more Xen host nodes if all the VMs had zero votes.

I'm not sure how that would help - if I lose another physical host, won't it still lose quorum? But sounds like a good idea anyways - I'll drop the VM's down to 0 votes.


Perhaps we should change "2-node" mode to allow >2 nodes provided the extra nodes all had zero votes ?

If possible, an option that would let me say "here's the number required for a quorum, I know I'm lying to you, but do it anyways" would be nice. :)


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| nate carlson | natecars natecarlson com | http://www.natecarlson.com |
|       depriving some poor village of its idiot since 1981            |
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