Exchange DAG issue

Question

Exchange DAG issue

Red Tea Yu 1

Hi all.
I have 2 Exchange Server 2016 and form a DAG group. 1 Exchange Server with mailDB activated now facing network issue and unable to replicate the mails to another one. I tried to activate the copy on another server also failed as the copy queue (over 4000 queues) had exceeded the limit. Could someone advise the best practice for this suituation? Many thanks.

Yuki Sun-MSFT 41,456 Reputation points Moderator

2021-11-24T07:35:01.823+00:00

Hi @Red Tea Yu ,

Agree with Andy that if possible, it would be better to fix the network issue first. Otherwise, you can run the Move-ActiveMailboxDatabase command as recommended by Andy to force switchover to the other server with potential loss.
Yuki Sun-MSFT 41,456 Reputation points Moderator

2021-11-30T07:10:35.737+00:00

Hi @Red Tea Yu ,

Just checking in to follow up with this thread. If the suggestion provided by Andy was helpful, you can click the "Accept Answer" button under his post so that it can be beneficial for others reading this thread. If you have any questions or need further help on this issue, feel free to post back.

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Yuki Sun-MSFT 41,456 Reputation points Moderator

2021-11-24T07:35:01.823+00:00

Hi @Red Tea Yu ,

Agree with Andy that if possible, it would be better to fix the network issue first. Otherwise, you can run the Move-ActiveMailboxDatabase command as recommended by Andy to force switchover to the other server with potential loss.
Yuki Sun-MSFT 41,456 Reputation points Moderator

2021-11-30T07:10:35.737+00:00

Hi @Red Tea Yu ,

Just checking in to follow up with this thread. If the suggestion provided by Andy was helpful, you can click the "Accept Answer" button under his post so that it can be beneficial for others reading this thread. If you have any questions or need further help on this issue, feel free to post back.

Answer 1

Andy David - MVP 160.3K MVP Volunteer Moderator

Can you Fix the network issue first?

You can force the mount on the other server but you may lost some mail in the process.

Move-ActiveMailboxDatabase <DB> -ActivateOnServer <OtherMailServer>  -SkipHealthChecks -SkipActiveCopyChecks -SkipClientExperienceChecks -SkipLagChecks - 
MountDialOverride:BESTEFFORT

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