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the event log as below
A request to mount Active or Passive database was processed in 0.0214939 seconds.
Flags: 0x00000008
Error code: NoError (0x00000000)
Information Store - (47140,R,0,15.01.1779.002) The database engine has begun replaying logfile E:\Program Files\Microsoft\Exchange Server\V15\Mailbox\database\E04.log.
Previous Log Processing Stats:
1 395.168726 -2.929166 (1584) CM +J(CM:1584, PgRf:329433, Rd:3696/31, Dy:3782/520119, Lg:139787869/556120) +M(C:1341976K, Fs:237443, WS:363016K # 348824K, PF:1381028K # 1367372K, P:1381028K).
Then run a log to copy to E drive
“Information Store - MBX - Senior01 (47140,R,0,15.01.1779.002) MBX - Senior01: The database engine has begun replaying logfile E:\Program Files\Microsoft\Exchange Server\V15. “
how to avoid this status , because when failover to other database , around 1 hr the database will auto switch to original database and mounted back
is it the right not good or other possible reason
it is too trouble because the status happen the user outlook will no response and hang
have active preference ,
setup log is which folder
i only found Program Files\Microsoft\Exchange Server\V15\Mailbox , only database folder
It should be in <ExchangeInstallDrive>:\ExchangeSetupLogs\DagTask, by default it's C.
It's not like the database logs, it only record the operation on DAG.
but always show other Exchange B mounted default on Exchange A database
I'm not pretty understand this, do you mean the Exchange A database has a most preferred copy with Exchange B database?
In this case, i think you should check about the Number of these copies as i replied above.
And i will go on researching and follow this issue.
Regards,
Lou
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Hi
i face other issue on exchange , the exchange B auto start at 4 days ago
the event log is
Cluster node 'EXG01A' was removed from the active failover cluster membership. The Cluster service on this node may have stopped. This could also be due to the node having lost communication with other active nodes in the failover cluster. Run the Validate a Configuration wizard to check your network configuration. If the condition persists, check for hardware or software errors related to the network adapters on this node. Also check for failures in any other network components to which the node is connected such as hubs, switches, or bridges
then EXG01B have restart , have any advise on this
Hi @Louis Ruth ,
Thanks for providing these information.
I found an article about this event, it could be helpful:
Troubleshooting cluster issue with Event ID 1135
Seems like it may because of several reasons like cluster or network settings.
Also, if you could, please try to remove the DAG and recreate one to test if the DAG has issues.
Bests,
Lou
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but my cluster node service no show on GUI 
have any advise
Hi,
The DAG uses cluster as it's foundation. But we can't connect with it using Failover Cluster Manager, it is by-design.
Regards,
Lou
how should check my cluster problem or not
show other Exchange B mounted default on Exchange A database
Exchange A database has a most preferred copy
but event log show you before trigger database mounted to exchange B
Number of these copies show you
is 1 copy
Hi @Louis Ruth ,
The DAG is a cluster, a node of a cluster is like a member server of a DAG.
I think, if you could, you can remove the member servers then remove the DAG and recreate one.
Best regards,
Lou
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The performance counter '\MSExchange Assistants - Per Database(msexchangemailboxassistants XX-XX )\Event Dispatchers Catching Up' sustained a value of '35,659.00', for the '30' minute(s) interval starting at '2/22/2021 1:26:00 AM'. Threshold breached since '2/17/2021 11:26 AM'. None Trigger Name:EventDispatchersCatchupQueueTrigger. Instance:msexchangemailboxassistants XX-XX
every half hour have pop up this error
how to solve
The DAG is a cluster, a node of a cluster is like a member server of a DAG.
I think, if you could, you can remove the member servers then remove the DAG and recreate one.
re-create have how long down time
The performance counter '\MSExchange Assistants - Per Database(msexchangemailboxassistants XX-XX )\Event Dispatchers Catching Up' sustained a value of '35,659.00', for the '30' minute(s) interval starting at '2/22/2021 1:26:00 AM'. Threshold breached since '2/17/2021 11:26 AM'. None Trigger Name:EventDispatchersCatchupQueueTrigger. Instance:msexchangemailboxassistants XX-XX
every half hour have pop up this error
how to solve
Hi @Louis Ruth ,
Sorry for the delay, I had a leave for the previous days.
According to my research, this error "The performance counter" seems like a cosmetic error and all the resolutions are to stop it by
re-create have how long down time
Won't be long if you don't have so many member servers, but you will have to remove the database copies first.
Exchange server won't stop when removing the DAG, so you don't have to worry that.
is it need to same setup to my existing 3 exchange servers ?
Hi,
Do you mean clean the cosmetic error messages? You can modify it where the error log occurs.
Regards,
Lou
i mean do this Change "ExchangeJobs.Triggers.EventDispatchersCatchupQueueTrigger" from "True" to "False"..
for my enviroment 3 exchange server to bypass this error
and after this change , is it happen error also not detect
Hi,
The error message is likely a bug but it does not affect the programs&processes. So we can ignore them by turn the EventDispatchersCatchupQueueTrigger to False to make it disappear in Server Manager.
Regards,
Lou
