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Exchange 2013 high availability best practices

I am currently running a windows server 2012 R2 with exchange 2013 SP1 CU5.
This is a virtual machine running on VMware.
I want to have high availability for this server in the future.

What are the best practices in the current situation?

Tthe server has DAS, database and transaction logs are still on the default location.
Since I have the possibility to use NAS iSCSI storage, is it advisable to use this instead of DAS? (whole VM on SAN or just the db?)
Or, keep the DAS, JOBD with 1 volume with multiple databases? (and logs on the same volume)

In the current situation I think one extra virtual exchange server and a witness server should be setup for the DAG?

On the vmware side, so I also need to configure things? (cluster Vmware, ...?)

Do you have other hints, tips, advise?
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Will Szymkowski
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Yeah, I meant iSCSI SAN off course ;)

The thing is that I found all these best practices but it's a bit too many info at once ... .
This is not a big exchange environment, and so still a small db.
So, before creating the DAG environment, I was wondering which steps are 'essential' ... for now, to provide the best high availability at the lowest cost.

That is why I am wondering what are the best practices for a small environment:
- SAN or local DAS? (local DAS in raid or JOBD as microsoft recommends?)
- db and transaction logs on seperate volumes or drives? or one volume per drive and with multiple db per volume?
- one extra exchange and one witness server (or go for two extra virtual exchange servers, one in the datacenter and one in the office)?

I don't think clustering the VMware host is an option for now, I can always do that later.
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