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1st. &nbsp;Check to make sure there aren't any backup jobs running in this time window.<br />
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2nd. Try expanding the time window in which the online defrag runs.
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1st.  Check to make sure there aren't any backup jobs running in this time window.

2nd. Try expanding the time window in which the online defrag runs.

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yes backups are running this time frame...<br />
why ?? 
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yes backups are running this time frame...
why ??

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Backup of the Exchange server? &nbsp;If so change the time. &nbsp;Backing up the Exchange Server during a online defrag will kill the defrag.
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Backup of the Exchange server?  If so change the time.  Backing up the Exchange Server during a online defrag will kill the defrag.

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but the online defrag took place last night ,,,,it is set to start on Sat night at 11pm<br />
why does it do defrag on its own ?? 
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but the online defrag took place last night ,,,,it is set to start on Sat night at 11pm
why does it do defrag on its own ??

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ah , makes sense....makes perfect sense.
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Hi, all my exchange servers go under online defragmentation in &quot;random&quot; hrs... Last night my server 1 went through an online defrag and dismounted mailbox stores. <br />
here is ..straight from the log ....<br />
&quot;&quot;&nbsp; &nbsp;Information Store (4776) Third Storage Group: Online defragmentation of database 'Y:\Exchsrvr\mdbdata\Mailb<wbr />ox Store 12.edb' was interrupted and terminated. The next time online defragmentation is started on this database, it will resume from the point of interruption. .....&quot;&quot;<br />
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although it is scheduled to start Saturday night at 11:00 pm &nbsp;it did last night. &nbsp;any ideas , why ??
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Hi, all my exchange servers go under online defragmentation in "random" hrs... Last night my server 1 went through an online defrag and dismounted mailbox stores. 
here is ..straight from the log ....
""   Information Store (4776) Third Storage Group: Online defragmentation of database 'Y:\Exchsrvr\mdbdata\Mailbox Store 12.edb' was interrupted and terminated. The next time online defragmentation is started on this database, it will resume from the point of interruption. .....""

although it is scheduled to start Saturday night at 11:00 pm  it did last night.  any ideas , why ??

exchange 2003 online defragmentation question

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.