Instance purposes

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Posted on by spyroot

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Hello,

I do have a NAV database with 30 divisions, and the NAV server only have one NAV instance. Also, I do have the SQL server running under the same server.

Question: What's the purpose of setting multiple NAV instances? Will that help with performance?

A month ago, we virtualize the server noticing performance downgrade. I don't know if by setting multiple instances may help improving the performance.

Current HW:

CPU's: 8 Core

Core per socket 4

Memory : 128 GB

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spyroot 1,645 on at

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RE: Instance purposes

Thank you for the advise.
spyroot 1,645 on at

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RE: Instance purposes

Thank you for your detailed explanation.
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Inge M. Bruvik 32,748 Super User 2024 Season 1 on at

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RE: Instance purposes

Virtualization almost always comes with a performance penalty of some degree.

So i believe scale out is better than scale up.

I would recommend you put your SQL server on a separate server. TheSQL server can consume a whole lot of memory and I/O capacity on your server, that will usually have a negative effect on the NAV services running on the same computer unless you limit the available resources for the SQL server.
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Gearoid on at

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RE: Instance purposes

Hi Alex,

Here are some reasons why you might want to configure multiple instances of NAV on the same Server machine:

1. Resilience: i.e. if you spread users across multiple NAV Services (NSTs) and one NST crashes then only a subset of users are impacted.

2. If you want to support multiple authentication methods for Users, e.g. One NST for NAVUserPassword authenticted users and another one for Windows users.

3. You may want separate NSTs to have flexibility with how you configure the service for different requirements, e.g. One NST for batch jobs requiring a smaller data cache size and a separate NST for Users.

4. With very old versions of NAV the NST was written as a 32-bit application so you would need multiple NSTs to scale up the number of users due to the RAM constraints with 32-bit apps. Modern versions of NAV have a 64-bit NSTs so this reason is no longer a factor.

You may not get any performance benefit per se from configuring multiple NSTs.

See here for the NAV/BC Performance guide which may be of assistance more generally with performance issues: docs.microsoft.com/.../performance-overview

Also, there are Dynamics partners available who can provide specialist performance advice for Dynamics NAV deployments if required.