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Anestis Psomas
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Exchange 2007 Volume Fragmentation

Hello ,

Today we receive a message from SCOM that some of our volumes with the databases inside of our Exchange 2007 SCC installation has high fragmentation level. These volumes are iSCSI volumes on a SAN.

I check in the mailbox server in the Disk Defragmenter and indeed these volumes are 97% fragmented.

What will happen if the fragmentation level reach 100% ?

Can i start the defragmentation when the system is online ?

ExchangeWindows Server 2008

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Anestis Psomas

8/22/2022 - Mon
Manpreet SIngh Khatra

What will happen if the fragmentation level reach 100% ? - Performance issues with the Database and could affect users workings

Nopes please do not do anything during production hours .... and take backups before you do anything



- Rancy
Anestis Psomas

Hello Rancy ,

So , after reading this blog post http://blogs.technet.com/b/exchange/archive/2004/10/25/247342.aspx from the exchange team i am unsure what to do .

At their article they conclude that " The bottom line really is - you do not HAVE to file-level defrag the Exchange database drives.

You also said that if drive reaches 100% fragmentation i will have problems with the performance and it could affect users.

I am a little bit confused ;)

Thanks a lot for your help
Manpreet SIngh Khatra

I was more of a concern with VM fragmentation and NPP as they too come around the same time so check for them once and if they are good Exchange is fine

- Rancy
Your help has saved me hundreds of hours of internet surfing.

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Anestis Psomas

Thanks for the answer 172pilotSteve and Rancy,

As you said i will do only the reclamation of the file share as i have deleted a large number of emails from a customer.

Thanks again.