Difference EDB size between active database and passive database

[Max Coder]

Hi,


I created new database in Exchange DAG. And I added passive copies with Add-MailboxDatabaseCopy.
But I noticed something. I saw you difference between active copy and passive copy EDB.
DB01 : 250MB , passive copy db size : 140MB
DB01 log folder : 34 items, passive log: 31 items

is this difference normal? so there is no replication problem in the system. Everything is healthy.

[Philip Elder]

I’m thinking whitespace in the source for one. The dumpster for another.

 

Plus, there may be some system mailboxes on the active one that are consuming space.

 

Philip Elder MCTS

Senior Technical Architect

Microsoft High Availability MVP

MPECS Inc.

E-mail: Phili...@mpecsinc.ca

Phone: +1 (780) 458-2028

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[Michael B. Smith]

System mailboxes are also replicated.

 

I’d lay odds on white space.

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[maxcoder1]

Hi All,

like you said , There is wihitespace in the mailbox database. But is this normal? I mean, when I create fresh mailbox database, shouldn't  AvailableNewMailboxSpace   be 0?

[PS] C:\>Get-MailboxDatabase -Status | Select Name, DatabaseSize, AvailableNewMailboxSpace | Sort-Object -Descending AvailableNewMailboxSpace

Name DatabaseSize                     AvailableNewMailboxSpace
---- ------------                     ------------------------
DB01 247.9 MB (259,981,312 bytes)      116.4 MB (122,060,800 bytes)

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[Michael B. Smith]

It’s complicated. But long story short, only until the first time the mailbox assistant runs and rebalances the index trees.

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[maxcoder1]

mailbox assistant runs and rebalances the index trees, Is there a schedule for these tasks? or do we trigger them manually?

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[Michael B. Smith]

The only guarantee is that it runs at least once every seven days.

 

It used to be possible to schedule it, but they removed that, I think it was in Exchange 2016. But don’t quote me on that. A long time ago, anyway.

 

In Exchange 2019, you can REQUEST it to be kicked off by running Start-MailboxAssistant, but it’s not guaranteed to run when you request it.

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