Exchange Defrag

Posted on 2008-10-13
Medium Priority
Last Modified: 2012-05-05
I'm having performance issues with Exchange. My main office is in NYC but I also have a remote office in london with at least three users who connect to the nyc server via a p2p T1 (users in nyc are not complaining of slowness although Ive seene exchange work faster). The users in London are complaining that exchange is very very slow. I analyzed the partition where the exchange Istore is seating and found it was heavily fragmented. [See attach]. My question is, do I need to do an offline exchange defrag to resolved this? Should I run windows Disk defragmenter ? or Both? Please advise.

Question by:Hombre_ordinario
LVL 24

Expert Comment

ID: 22704969
An offline defrag would work fine but takes forever.  What will also work just as effective and manage time better is to move the mailboxes to a new store (assuming you have 2k3 enterprise)
When you create a new storage group it creates a new database and moving mailboxes to it just filles the dbase.  This creates a compact and clean dbase and is a preferred method then an offline defrag.

Expert Comment

ID: 22704983
Of sure, you should run the windows defrag.
For the exchange defrag, you can check the 1221 event:

LVL 32

Accepted Solution

gupnit earned 1000 total points
ID: 22705223
For an Exchange Database you will need to run Offline Defrag.
Now coming back to your issue, see had Defrag been an issue everyone including NY Users would have been complaining. See this looks more like a network issue that is causing it as all users who are complaining are from London (3 users).
Also, make sure that you Cache Mode enabled for those users.
Let me know
Free tool for managing users' photos in Office 365

Easily upload multiple users’ photos to Office 365. Manage them with an intuitive GUI and use handy built-in cropping and resizing options. Link photos with users based on Azure AD attributes. Free tool!


Assisted Solution

CoreyMac earned 1000 total points
ID: 22706390
Nitin is completely correct.  
Cached Exchange mode is THE most important setting from a remote Outlook client performance point of view.  If the local folks are happy, enabling Cached Exchange mode will basically make the London folks perform like the local clients.
Defrags, online/offline, location of disk files and logging volumes, NTFS fragmentation and such are all important at certain times, but if the local folks are happy, then setting the Cached mode in the client should make things much better.
If you still are thinking the defrags need to be done, capture the Peformance Monitor disk/CPU/Network/Exchange objects on the server during a 24hour period that covers when the Londoners are having slowness issues.  If the disk subsystem performance is the issue it will show up there.
 For Outlook 2003:
For Outlook 2007:
For Exchange performance monitoring try this:
Let us know if we can help further.

Expert Comment

ID: 23145581
It is hard to say what the ultimate solution to slow users in only London would be but witha single Information Store database, the defrag the author was asking about would most likely do nothing at all to resolve the issue described.

Nitin is the first responder with the correct next steps.
LVL 32

Expert Comment

ID: 25430876

Why Delete? I gave correct answer...

Featured Post

Get expert help—faster!

Need expert help—fast? Use the Help Bell for personalized assistance getting answers to your important questions.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

The Exchange database may sometimes fail to mount owing to various technical reasons. A dismounted EDB file can be the source of many Exchange errors including mailbox inaccessibility for users. Resolving the root cause of mounting problems becomes …
Let us take a look at the scenario, you have a database that is corrupt and you run the ESEUTIL command only to find you are unable to repair it. How do you now get the data back?
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…
There are cases when e.g. an IT administrator wants to have full access and view into selected mailboxes on Exchange server, directly from his own email account in Outlook or Outlook Web Access. This proves useful when for example administrator want…

621 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question