How to stop Online Defragmentation of System Volume Information file? - Event ID 700 & 701 - ESENT

I'm seeing Event IDs 700 and 701 logged every hour on a Windows Server 2008 Standard SP2 box, here's a couple of event logs (they're all identical other than the time stamp):

Log Name:      Application
Source:        ESENT
Date:          29/05/2010 11:00:42 PM
Event ID:      700
Task Category: Online Defragmentation
Level:         Information
Keywords:      Classic
User:          N/A
Computer:      WT-Server.wineandtruffle.com.au
Description:
DFSRs (1676) \\.\C:\System Volume Information\DFSR\database_F05C_88FF_5C88_C238\dfsr.db: Online defragmentation is beginning a full pass on database '\\.\C:\System Volume Information\DFSR\database_F05C_88FF_5C88_C238\dfsr.db'.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="ESENT" />
    <EventID Qualifiers="0">700</EventID>
    <Level>4</Level>
    <Task>10</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2010-05-29T15:00:42.000Z" />
    <EventRecordID>30571</EventRecordID>
    <Channel>Application</Channel>
    <Computer>WT-Server.wineandtruffle.com.au</Computer>
    <Security />
  </System>
  <EventData>
    <Data>DFSRs</Data>
    <Data>1676</Data>
    <Data>\\.\C:\System Volume Information\DFSR\database_F05C_88FF_5C88_C238\dfsr.db: </Data>
    <Data>\\.\C:\System Volume Information\DFSR\database_F05C_88FF_5C88_C238\dfsr.db</Data>
  </EventData>
</Event>

Log Name:      Application
Source:        ESENT
Date:          29/05/2010 11:00:42 PM
Event ID:      701
Task Category: Online Defragmentation
Level:         Information
Keywords:      Classic
User:          N/A
Computer:      WT-Server.wineandtruffle.com.au
Description:
DFSRs (1676) \\.\C:\System Volume Information\DFSR\database_F05C_88FF_5C88_C238\dfsr.db: Online defragmentation has completed a full pass on database '\\.\C:\System Volume Information\DFSR\database_F05C_88FF_5C88_C238\dfsr.db'.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="ESENT" />
    <EventID Qualifiers="0">701</EventID>
    <Level>4</Level>
    <Task>10</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2010-05-29T15:00:42.000Z" />
    <EventRecordID>30572</EventRecordID>
    <Channel>Application</Channel>
    <Computer>WT-Server.wineandtruffle.com.au</Computer>
    <Security />
  </System>
  <EventData>
    <Data>DFSRs</Data>
    <Data>1676</Data>
    <Data>\\.\C:\System Volume Information\DFSR\database_F05C_88FF_5C88_C238\dfsr.db: </Data>
    <Data>\\.\C:\System Volume Information\DFSR\database_F05C_88FF_5C88_C238\dfsr.db</Data>
  </EventData>
</Event>

This server is NOT running Exchange - it's a PDC with AD and a file server. There are no other servers it is synchronising with - it's the only server in the domain.

Is there some way to turn off Online Defragmentation? Failing that, is it safe to simply stop the DFS Replication Service and delete the C:\System Volume Information\DFSR\database_F05C_88FF_5C88_C238 directory and then restart the service, or will it bring the server to a crashing halt? Or is there another way to get rid of this?

Thanks,

Trevor