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| Should we use more than 2 FRs for a cluster in 2 cities |
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| issac |
 Posted: Sun Jul 08, 2012 10:17 pm Post subject: Should we use more than 2 FRs for a cluster in 2 cities |
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Disciple
Joined: 02 Oct 2008
Posts: 158
Location: Shanghai
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Hello,
We're setting up a cluster covering queue managers geographically located in 2 cities. In each city there's going to be 10 QMGRs.
We think holding 2 Full Repositories might be the most efficient way. We thought about having 1 FR in each city, but we're not really sure about the idea since network is more likely to have failures considering the distance of 2 cities. If the network is down for some time then we would be at the risk of running with only 1 FR.
Then should we create 4 FRs, 2 in each city? This is something what we never did before...
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| Michael Dag |
| Posted: Sun Jul 08, 2012 11:37 pm Post subject: |
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Jedi Knight
Joined: 13 Jun 2002
Posts: 2607
Location: The Netherlands (Amsterdam)
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Run with 1 or 2FR's only,
syncing of FR's is based on 2FR's not 3 or 4 or ... whatever...
message traffic is not impacted when FR's are down.
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| bruce2359 |
| Posted: Mon Jul 09, 2012 4:03 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
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Geography is one possible consideration in cluster design.
If you believe that the distance, network bandwidth, reliability, etc., between city1 and city2 pose a risk to cluster survival, then set up each city as a cluster (with the requisite 2 FRs); then overlap cluster(city1) and cluster(city2). Each city cluster can exist separately should the other city cluster fail.
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| Vitor |
| Posted: Mon Jul 09, 2012 5:10 am Post subject: Re: Should we use more than 2 FRs for a cluster in 2 cities |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| issac wrote: |
| If the network is down for some time then we would be at the risk of running with only 1 FR. |
No, you'd still have 2 FRs, they just wouldn't be in communication. How much of a risk is that? Seriously? Given that all the FRs ever talk about is cluster changes, how dynamic is your environment that this is a problem?
Given the more serious problem that any PR queue manager that needs to pass business messages to a PR in the other city will be likewise out of luck?
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