Exchange 2013 - Passive Database disk running out of space

Scotch Tech
Scotch Tech used Ask the Experts™
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We're running Exchange 2013. We have a DAG with 3 copies of a DB. One of the DB's is on a server in our DR site.
It's running low on space, I need to know what happens to the Active database copies on the other server if the disk runs out of space on the DR servers.

Reason is a consultant told us that if the db copy disk runs out of space, the other copies including the active copy will go offline.

I can't find any documentation.
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Edward van BiljonMessaging and Collaboration Technical Lead (Exchange MVP & MCT)

Commented:
The thing is it won't be able to update and will dismount and your catalog will go into a failed and suspended state. I would rectify this as soon as possible
MASEE Solution Guide - Technical Dept Head
Most Valuable Expert 2017
Commented:
-->Reason is a consultant told us that if the db copy disk runs out of space, the other copies including the active copy will go offline.
Passive database copies will enter a failed state, but the active copy will remain on-line.
If you want you can pause the database copy.
Suspend-MailboxDatabaseCopy -Identity DB1\Server1 -SuspendComment "Maintenance on passive server" -Confirm:$False

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Resume replication.
Resume-MailboxDatabaseCopy -Identity DB1\Server1

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AmitIT Architect
Distinguished Expert 2017

Commented:
Is there any reason, why one of your DB copy going out of disk space. I assume you have same disk size for all DB's. What exactly taking the space, is DB size or log. Are you taking full backup, to clear up the logs.
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Author

Commented:
Not the same size. We just need to keep these maintained until we move to new servers and Exchange 2016 within the next 2 months. I really just need to know what happens when the passive copy runs out of space. If the Active copy remain active and functions, then I am not too concerned, can I can just remove that copy.

Are there any articles stating what would happen in this scenario?
AmitIT Architect
Distinguished Expert 2017
Commented:
As you don't have same disk size, you are facing this issue. For now, you can remove the db copy on which you are facing disk space issue. If you don't increase disk space or remove the copy, Exchange will dismount the database to protect it from corruption.
EE Solution Guide - Technical Dept Head
Most Valuable Expert 2017
Commented:
-->can I can just remove that copy.
Yes you can but again it will depend on your database size to reseed and get a healthy copy.
Till that time your HA is lost.

Author

Commented:
I'm not concerned with re-seeding as we will have new servers within 2 months. We still have 2 copies in the primary datacenter, the DR is a 3rd copy. I just want to hold off as long as possible, hopefully until we get the new servers.

I just need to confirm 100% that the the active database will remain acitve/online uninterrupted if a passive copy disk runs out of space.
Edward van BiljonMessaging and Collaboration Technical Lead (Exchange MVP & MCT)
Commented:
If you remove the 3rd copy yes it should stay online
MASEE Solution Guide - Technical Dept Head
Most Valuable Expert 2017

Commented:
If you have 3 mailbox servers holding the same copy please go ahead and remove the passive copy your active will stay on-line as commented by Edward. Add it back once you are done with the storage upgrade/expansion.

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