XADM: Exchange Server 5.5 and Exchange 2000 Online Defragmentation Does Not Run During Backup

SUMMARY

In Exchange Server 5.5 and Exchange 2000, the online defragmentation schedule is controlled by the information store maintenance schedule. If online defragmentation does not complete by the end of the information store maintenance schedule, the current location is recorded, and the next online defragmentation begins at this point.

Exchange Server online defragmentation does not run during a backup session.

Because a backup program is running during the scheduled information store maintenance, it is possible that the online defragmentation process may never complete.

For large message stores, ensure that information store maintenance gets at least five hours each night that do not overlap with the backup schedule to finish its tasks.