SIS behaviour can be specified/modified per group. This article explains the different settings.
SIS behaviour options:
Minimum Space (default behaviour)
Disabled means global SIS is completely disabled for all accounts in the group. You will not benefit from files already on the StorageServer and none of the uploaded files will be placed in Global Storage. This has the least impact on the disk during backups and is also the fastest.
Minimum Space is how it currently operates. During the backup, all received files are checked against Global Storage to eliminate duplicates prior to transfer. This requires that Global Storage be accessed during the backup process, which slows down the validation and optimisation steps of the backup but ensures the smallest transfer.
When Max Speed is selected, the backup will always send all intended files to the Storage Platform, whether they exist in Global Storage or not. However, after a backup, any duplicates will be filtered out in a separate process, not holding up the backups and fully utilising Global Storage. This setting can be used in a high-bandwidth environment (like a LAN) where transfer savings are not important, since more data may be transmitted than is absolutely necessary.
Old Article ID: 36
Posted: 31 Aug, 2010 by Marais D.