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Exchange Store Size and Actual Size ????

Posted on 2007-03-26
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Last Modified: 2008-03-17
we are running windows 2003 sp1 and exchange 2003 sp1.

if i look at the email store files, the sizes are the following:
priv1.stm   =   4,540,424 kb
priv1.edb   =  16,290,504 kb

however, if i go through the exchange system manager, dump the user accounts to a file, and then calculate the mailbox store size, i get the number:

14,053,396 kb

is there any way to recover the 2gb that's missing ?  or is that pre-allocated for size ?

we have about 75 users on the exchange server, and it's the only email server that we have.

thanks !


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Question by:Eric
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Sembee earned 250 total points
ID: 18792423
Any reason you aren't on Exchange 2003 SP2?

Adding up the mailbox sizes will never give you the same numbers... you have other things to take in to account...

- deleted item retention
- single instance storage
- white space in the database (see event ID 1221 over night for that).
- plus general overhead of the database.

For 75 users a store of just over 20gb is fine. I wouldn't be worrying about the missing 6 gb. It isn't 2gb, as you have to take both the priv files to get the total size of the store.

Simon.
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by:Eric
ID: 18792629
we are running Exchange SP2, that was a typo on my behalf.

- our deleted item retention is set to 0 days

- for the single instance storage, where are the settings to check this ?

- i have checked for the 1221 errors in the event log, and i see it running and completing around the backup schedule.



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by:Eric
ID: 18792657
and what's an average amount of memory that the store.exe process is going to use ??   we have a pretty powerful server, and the store.exe process is using 615,644 K of memory.

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Expert Comment

by:Sembee
ID: 18792658
You cannot do anything about single instance storage. It is something that Exchange does itself.

If you send an email with a 10mb attachment to ten people in Exchange, then it will take up 10mb of space in the database. That is SIS.
You can see the current ratio of SIS using perfmon, but it will not tell you how much is currently in SIS.

How much free space did Event ID 1221 report?

Any reason you are running DIR at 0? I usually recommend at least 14 days, and run most of my sites at 30 days. It means the chances of needing to do a recovery of data is almost none.

Simon.
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by:Eric
ID: 18792679
running DIR at 0 because of space concerns with the amount of space free that the exchange data is on.

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by:Sembee
ID: 18792695
Exchange will use as much memory as it can - which is by design. It should give back the memory if something else asks for it.

Simon.
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