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тАО12-11-2010 09:05 AM
тАО12-11-2010 09:05 AM
Re: Managers - Confused!
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тАО12-11-2010 11:50 AM
тАО12-11-2010 11:50 AM
Re: Managers - Confused!
I'm thinking what if I temporarily lose Site A and wanted the P4000 in Site B to take quorum but not permanently as the manual suggests the "Recover Quorum" command would do.
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тАО12-12-2010 07:04 AM
тАО12-12-2010 07:04 AM
Re: Managers - Confused!
FOM was introduced to solve the original problem of requiring a customer to buy at least 3 nodes to create a high availability cluster.
Since you already have additional SAN/iQ nodes available in your management group, there isn't any benefit (that I can see) to using FOM over one of your existing nodes.
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тАО12-12-2010 07:15 AM
тАО12-12-2010 07:15 AM
Re: Managers - Confused!
Yes I was thinking about this and I'm less and less keen on the FOM as it seems to assume my primary site will always be available, and whilst it makes a link failure easy to deal with, it seems it makes a loss of Site A tricky to deal with.
Would I be correct in thinking the following is sensible?
Run regular 3 managers in Site A, and 2 regular managers in site B.
Link dies - A has Quorum.
B dies, A has Quorum.
A dies, split brain so bring up a VM in site B to regain quorum.
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тАО12-16-2010 08:50 AM
тАО12-16-2010 08:50 AM
Re: Managers - Confused!
The only thing that bothers me about the 3rd site, is if site A looses all network connectivity you are down..
I would keep an offline mirror of your FOM that normally is running at the 3rd site, so if you loose all links you can launch the "copy" of your FOM to regain SITE A functionality if needed.
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тАО12-16-2010 09:44 AM
тАО12-16-2010 09:44 AM
Re: Managers - Confused!
Tbh even ignoring the FOM issue, I'll sleep much better with a third switch and redundant network topology - really I think I stuffed up not planning that from the outset but those Proliant Microserver's are cheaper than a PC to just run the FOM.
As for HP's SFP/GBIC pricing however......
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тАО12-16-2010 05:10 PM
тАО12-16-2010 05:10 PM
Re: Managers - Confused!
At least 3 or 5 'nodes' to create a high availability cluster.
That's what it said on the box, in my garage.
If only, it was that simple.
30 years of VMS.
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тАО12-17-2010 06:38 AM
тАО12-17-2010 06:38 AM
Re: Managers - Confused!
You could even automate it with a script ie:
Sunday 3am, shutdown FOM
Copy disk files over WAN
restart FOM
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тАО12-17-2010 09:14 AM
тАО12-17-2010 09:14 AM
Re: Managers - Confused!
Presumably if you lose all three sites in different order due to, say, power or "something bad", but you they all come back (at different times as power is restored) quorum takes care of taking the cluster offline, then when things come back there's a resync/quorum is restored?
I can only test so much with yanking cables...
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тАО12-17-2010 12:16 PM
тАО12-17-2010 12:16 PM
Re: Managers - Confused!
How long can an 'ethernet cable' be?
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