On prem public folder performance issues

Colin 85 1 Reputation point
2022-09-01T07:59:51.987+00:00

Hi all,

We've been experiencing issues with our public folders for a few months now and I'm struggling to get to the root of the issue. I am running Exchange 2016 hybrid within a DAG. I have created a new 2016 Exchange server and migrated the data to that and the issue still persists.

What I have been seeing is whenever the following perfmon metric exceeds around 2 or more, this causes our on-premise public folders to hang momentarily:

MSExchange Store Interface(_Total)\RPC Requests outstanding

From what I gather this metric should be close to 0 if not all the time, yet for me can spike up to 15 for around 10 seconds a time every minute or two. Reading up on this, sources tend to say this is a resource issue, though I have had a VMWare specialist take a look our infrastructure to confirm there's no issue there.

Any suggestions on what I can look at further would be very much appreciated :)

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
7,339 questions
{count} votes

1 answer

Sort by: Most helpful
  1. Andy David - MVP 141.2K Reputation points MVP
    2022-09-02T11:54:48.917+00:00

    Is MAPI over HTTP enabled?
    https://learn.microsoft.com/en-us/exchange/clients/mapi-over-http/configure-mapi-over-http?view=exchserver-2019

    That always seems problematic for on-prem Exchange