Count Mailboxes Per Database Faster

Waiting for a script to gather data can be a frustratingly long experience at times.  A common task when using PowerShell cmdlets with Exchange 2010 is to enumerate mailboxes on a database.  If you are counting the number of mailboxes per database using Get-Mailbox, it’s possible to speed things up.  A faster method is to use Get-MailboxStatistics, although the cmdlets return different data, the mailbox count per database is what we want in a speedy manner.  I’ve created two scripts with a timer built into each so that the speed of mailbox enumeration can be effectively illustrated.  We are doing the following:

  • Comparing Get-Mailbox versus Get-MailboxStatistics.
  • Using a timer to illustrate the speed difference of counting mailboxes per database.

The test environment consists of 48 DAG databases with about 400 mailboxes on each, spread across four servers.

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Lost and Found DAG Databases

If you have a large amount of DAG databases you may want a quick way of identifying which Exchange mailbox role is hosting the active copy of your databases.  Sure you can take a look at the EMC but I have a quick way for you to determine if each database is mounted on the mailbox server specified with an activation preference of 1.  Credit for this script is to René van Maasakkers on his blog.

Start out with filtering down the databases that are part of a DAG and not recovery databases.  Then run a ForEach loop that will capture the name of the database, server on which the database is mounted, and the activation preference of the database.  Finally use Write-Host to enumerate the names grabbed earlier and use IF ELSE logic to output the status of the mounted database.

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DAG Replication Network

Setting up DAG replication is extremely important as outlined in Tim McMichael’s TechNet post, Exchange 2010: Collapsing DAG Networks.  Even when you correctly disable the MAPI network from log shipping, Exchange 2010 will still resort to log shipping on the MAPI network if there is a communication problem on the replication network.  Once you become aware that there has been a communications problem between DAG nodes on the DAG replication network, the next thing you should do is to check a few things out.


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