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Exchange DataBase Online Defrag

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Exchange DataBase Online Defrag - 18.Feb.2010 2:56:05 AM   
kangoogr

 

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Hello,
i have cleaned up many mailboxes out of huge amount of aroung 3 GB's and online defagmentation only cleanup 554MB's. Why is that? wouldnt suppose to free simiral space to the cleaned emails out of users mailboxes? Deletion keep settings are set to 0 days. Is it possible that my incremental backup that is on the same period with internal database maintanance cause this problem?i see in the event log that suspends defragmentation but after resuming it should have 121 event show the real amount of space defraged??

And for not opening new topic, i have created a a security group that i can see under all groups but i can not see it under global address list. Why is that??

Regards
JK

< Message edited by kangoogr -- 18.Feb.2010 3:43:55 AM >
Post #: 1
RE: Exchange DataBase Online Defrag - 18.Feb.2010 7:28:38 AM   
mark@mvps.org

 

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It's not going to release everything all at once and cleaning out 3GB of mailbox doesn't necessarily mean that 3GB will be recovered from the store. If you deleted a load of mail or mailboxes you could easily find that single instancing has retained the message.

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(in reply to kangoogr)
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RE: Exchange DataBase Online Defrag - 18.Feb.2010 7:33:11 AM   
kangoogr

 

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i have chaneg the time to 11:00am - 03:00pm just not to conflict with the backup. But i have users that during this period remotely connect to their mailboxes and work from home. Will online defrag affect their job or performance??

(in reply to mark@mvps.org)
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RE: Exchange DataBase Online Defrag - 18.Feb.2010 7:57:56 AM   
mark@mvps.org

 

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11am to 3pm? That's not a good time slot, surely. A better idea here is to set your backup to run at (say) 11pm and for your maintenance to kick in around 11:30pm. Unless you're doing snapshots the backup won't be finished by 11:30 so it will just queue until the backup is done and then kick in. There will be a processor and disk hit. Your job as the Exchange specialist is to provide the server with enough disks so as not to make disk IO during simultaneous user access and maintenance process an issue.

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RE: Exchange DataBase Online Defrag - 18.Feb.2010 8:32:55 AM   
kangoogr

 

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11pm(23:00) to 3am(03:00) was the time i chooce (was wrong on my previous post ) because my backup proccedure starts from 3am.
My thought was simple. Online defragmentation to be completed and then backup to start and finish normally at 6am.

This is wrong?? Will at the time of defragmentation remote users have affect on their mailboxes??

(in reply to mark@mvps.org)
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RE: Exchange DataBase Online Defrag - 18.Feb.2010 8:39:36 AM   
mark@mvps.org

 

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http://blogs.msdn.com/douggowans/archive/2009/02/17/24-hour-operation-several-thousand-mailboxes-high-concurrency-heavy-profiles-how-do-you-tune-online-maintenance.aspx will give you some guidance.
Your timelines are as good as any. As you see from the link there is no one right answer.
Make sure your processes are running to completion and you're getting the required ratio.

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RE: Exchange DataBase Online Defrag - 18.Feb.2010 8:41:56 AM   
kangoogr

 

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So my thought was right.
And my time schedule seems to be right also.

There will be no problem i suppose.

Correct?

But what about the remote user's connecting at this time??
The performance will be a little slower?

< Message edited by kangoogr -- 18.Feb.2010 8:45:38 AM >

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RE: Exchange DataBase Online Defrag - 18.Feb.2010 8:59:54 AM   
mark@mvps.org

 

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If you're running a system where enough users will be on it 24/7 then you should implement a server with enough memory and processor capability to cope and also add one or two additional disks to the database RAID group to handle the additional IO.
How many disks depends on a lot of factors.

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RE: Exchange DataBase Online Defrag - 18.Feb.2010 10:30:45 AM   
kangoogr

 

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I have only a couple of users that will probably maybe need to login at the time of defragment. Not always online but rarely.

Regards
JK

(in reply to mark@mvps.org)
Post #: 9
RE: Exchange DataBase Online Defrag - 22.Feb.2010 3:49:01 AM   
kangoogr

 

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Still and after cleaning main mailboxes, i see that online defragmentation was interrrupted and the size relaesed as free is xxx MB althought is should be greater. It says that online defragmentation will continue from the point it stopped next time is started. This means that will free up the white space when defrag proccess continues and reached the deleted space withing the database and free it??

Not all at once but litlle by little day by day will be white spaced??

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RE: Exchange DataBase Online Defrag - 22.Feb.2010 8:02:24 AM   
mark@mvps.org

 

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Seriously, stop over thinking this. It's all fine. Go away and look after something else. Your Exchange environment is doing ok.

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Post #: 11
RE: Exchange DataBase Online Defrag - 22.Feb.2010 8:05:12 AM   
kangoogr

 

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I am scared not to reach the 75GB limit.
That's why i am acting a bit weird.


Thx

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Post #: 12
RE: Exchange DataBase Online Defrag - 11.Mar.2010 12:34:43 AM   
rockey15

 

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PLs let me know the procedure to clean online defragment

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RE: Exchange DataBase Online Defrag - 11.Mar.2010 4:35:11 PM   
uemurad

 

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You've never mentioned how close to the 75GB limit you are.

You've never mentioned how much whitespace your online defrag reports (Event 1221 in the Application Log).

If you are talking about an offline defrag, you aren't going to recover any more space than what your whitespace reports indicates.

You sound close to panic, and I am trying to determine if that is justified.

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Regards,

Dean T. Uemura
Microsoft MVP - Exchange (2007-2011)
exchangeguy.blogspot.com
uemurad@yahoo.com

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