Exchange 2019 large distribution group - Disk Queue Length slows mail server

Copper Contributor

We have 2 * Exchange 2019 servers running in a DAG with approx 11,000+ users.  To send out urgent notifications we have a Distribution group with all users that we send out to.  We do not want a 3rd party company.  There are several departments that use this DL too that have the autority.  Our organisation is linked with 2 other organisations each with their own DAG but 1 AD/Exchange environment.

When we send out to this DL, there is a lag in users' Outlook experience and we notice the Disk Queue Latency jumps up to around 5-10 for about 5 minutes and we can see the message queue has up to around 100 messages per DB.

What I am look for is a way to Throttle either the sending mailbox (in messages per minute and not per day such as the recipientratelimit setting) or the 20 mailbox databases from accepting such a large burst.  Exchange databases are spread over 2 drives with separate log drives.  Mailbox totals are around 13TB.

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