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| mlc |
 Posted: Tue Aug 09, 2016 2:35 pm Post subject: When to use a single Full Repository |
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Newbie
Joined: 20 Jun 2016
Posts: 3
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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 |
| Posted: Tue Aug 09, 2016 4:01 pm Post subject: |
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Jedi Knight
Joined: 25 Mar 2003
Posts: 2538
Location: Melbourne, Australia
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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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Glenn |
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| rammer |
| Posted: Tue Aug 09, 2016 4:26 pm Post subject: Re: When to use a single Full Repository |
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Partisan
Joined: 02 May 2002
Posts: 359
Location: England
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| 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?
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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 |
| Posted: Wed Aug 10, 2016 3:42 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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The general recommendation is that you shall count to 2 FRs. Neither shall you count to 1 unless...
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| Vitor |
| Posted: Wed Aug 10, 2016 5:01 am Post subject: Re: When to use a single Full Repository |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| 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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Insanity is the best defence. |
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| bruce2359 |
| Posted: Wed Aug 10, 2016 8:10 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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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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