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Differene between Mailbox database seeding and replication

What is difference between Exchange mailbox database seeding and replication?
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Muhammad Asif
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Muhammad Asif
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Iamthecreator OMAdministrateur Systeme et ReseauxCommented:
You would want to seed a database when you want to create a copy of a particular database. This can be done from a passive or active copy. It is recommended to use a passive copy to reduce load on  the active.
Once the seeding is done you can select the option to replicate the database to keep it up to date. The replication is always done from an active copy.
After the seeding you can also opt out of replication and leave  the database in suspended mode.
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Muhammad AsifAuthor Commented:
Hi Iamthecreator OM,

Thanks for sharing the valuable information. So seeding is only happend when we add mailbox database on secondary Exchange server in DAG?
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Iamthecreator OMAdministrateur Systeme et ReseauxCommented:
Yes.

Updating, also known as seeding, is the process in which a copy of a mailbox database is added to another Mailbox server in a database availability group (DAG). The newly added copy becomes the baseline database for the passive copy into which log files copied from the active copy are replayed. Seeding is required under the following conditions:

    When a new passive copy of a database is created. Seeding can be postponed for a new mailbox database copy, but eventually each passive database copy must be seeded to function as a redundant database copy.

    After a failover occurs in which data is lost as a result of the passive database copy having become diverged and unrecoverable.

    When the system has detected a corrupted log file that can't be replayed into the passive copy of the database.

    After an offline defragmentation of any copy of the database occurs.

    After the log generation sequence for the database has been reset back to 1.

Source: Update a mailbox database copy
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Muhammad AsifAuthor Commented:
Hi Iamthecreator OM,

Thanks for your detailed answers. So we can say that replication or seeding are same ?  Moreover, can you please let me know what is suspend state of mailbox databse copy.  If I suspend mailbox database copy then would it mean?  

The mailbox database copy would keep it self update to date by replicating from active copy if I suspend it?
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Muhammad AsifAuthor Commented:
In addation to my last comment, If I run the below command then would passive copy would also stop the replication/seeding from active copy?

Suspend-MailboxDatabaseCopy -Identity DB2\MBX2 -ActivationOnly -Confirm:$False
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Iamthecreator OMAdministrateur Systeme et ReseauxCommented:
Suspend-MailboxDatabaseCopy -Identity DB2\MBX2 -ActivationOnly -Confirm:$False

This would suspend the activation of the database copy without any confirmation prompt.

For more information on the syntax and switches please refer to the following.
Suspend-MailboxDatabaseCopy
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Iamthecreator OMAdministrateur Systeme et ReseauxCommented:
To suspend a database copy
Suspend-MailboxDatabaseCopy -Identity DB2\MBX2 -SuspendComment "reason for suspending" -Confirm:$False
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