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MQSeries.net Forum Index » Clustering » When to use a single Full Repository

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mlc
PostPosted: Tue Aug 09, 2016 2:35 pm    Post subject: When to use a single Full Repository Reply with quote

Newbie

Joined: 20 Jun 2016
Posts: 3

We're building a new cluster that will start with 2 queue managers and then grow. Is it best to use 2 Full Repositories (as recommended), or is it better to start with 1 Full Repository and then add another as the cluster grows?

The cluster will probably not contain more than 4 maybe 6 queue managers. We've read the recommendations to dedicate a server for a Full Repository and nothing else, but with such a small cluster is this still necessary?

Thanks in advance....
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gbaddeley
PostPosted: Tue Aug 09, 2016 4:01 pm    Post subject: Reply with quote

Jedi

Joined: 25 Mar 2003
Posts: 2492
Location: Melbourne, Australia

1 FR is a single point of failure. Start with 2 FR. Ensure they are on reliable servers (eg. HA).

If the 2 initial qmgrs will have heavy app messaging usage, it may be justified to set up 2 separate qmgrs as the FRs (even if they are on the same servers as the app qmgrs). Otherwise, the initial qmgrs can be used as the FRs.

I assume the 2 initial qmgrs are on different servers.
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rammer
PostPosted: Tue Aug 09, 2016 4:26 pm    Post subject: Re: When to use a single Full Repository Reply with quote

Partisan

Joined: 02 May 2002
Posts: 359
Location: England

mlc wrote:
We're building a new cluster that will start with 2 queue managers and then grow. Is it best to use 2 Full Repositories (as recommended),.


Yes

mlc wrote:


The cluster will probably not contain more than 4 maybe 6 queue managers. We've read the recommendations to dedicate a server for a Full Repository and nothing else, but with such a small cluster is this still necessary?


Not exactly necessary, more depends on how much processing power / memory your main operating queue managers will take on that server.

There is also a shout that people will say put them on HA but again that is not 100% required as a cluster will work if a repository fails until new objects etc are attempted to be added, and if you have 2 on seperate servers, etc etc it would give some peace of mind (not all though)
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mqjeff
PostPosted: Wed Aug 10, 2016 3:42 am    Post subject: Reply with quote

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Joined: 25 Jun 2008
Posts: 17447

The general recommendation is that you shall count to 2 FRs. Neither shall you count to 1 unless...
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Vitor
PostPosted: Wed Aug 10, 2016 5:01 am    Post subject: Re: When to use a single Full Repository Reply with quote

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Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA

mlc wrote:
We're building a new cluster that will start with 2 queue managers and then grow. Is it best to use 2 Full Repositories (as recommended), or is it better to start with 1 Full Repository and then add another as the cluster grows?


No. MQ clusters have 2 Full Repositories. Irrespective of size.

mlc wrote:
The cluster will probably not contain more than 4 maybe 6 queue managers. We've read the recommendations to dedicate a server for a Full Repository and nothing else, but with such a small cluster is this still necessary?


At what point will you decide you need a dedicated queue manager for an FR? How much work will it be to demote one of the existing FRs and add a new FR to the cluster? Then retesting all the applications?

(Hint: much more work than starting out with a properly sized dedicated queue manager as the FR)
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bruce2359
PostPosted: Wed Aug 10, 2016 8:10 am    Post subject: Reply with quote

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Joined: 05 Jan 2008
Posts: 9394
Location: US: west coast, almost. Otherwise, enroute.

The title your post asks:
Quote:
When to use a single Full Repository?

The answer: When one of your two FRs fails, and for only as long as it takes for you to restore the failed FR.
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