Dell EqualLogic Auto-Snapshot Manager/Microsoft Edition Version 5.4 User's Guide

Snapshot Space Borrowing

Snapshot space borrowing is enabled by default for all volumes created PS Series groups running firmware version 6.0 and higher, and snapshot space borrowing can be enabled on volumes created before the group was updated to version 6.0 and higher.

When snapshot space borrowing is enabled for a volume, its Smart Copies display the following properties:

• Snapshot Space Borrowing (enabled/disabled/unavailable)
• Snapshot Borrow Space In Use—Amount of space that the Smart Copy (snapshot) is using from borrowed space.

  If snapshot space borrowing is enabled, the only supported snapshot reserve policy is to delete the oldest Smart Copy. Snapshot space borrowing is mutually exclusive of the snapshot space recovery policy of setting the volume and its snapshots (Smart Copies) offline.

• Features—Supports Synchronous Replication. Indicates that the volume is enabled for SyncRep. If the Smart Copy supports SyncRep, the replication state is Not configured.

  The Smart Copy list displays all the available Smart Copies for both the Sync-Active and Sync-Alternate volumes, but only the Smart Copies for Sync-Active volumes can be restored. See the Dell EqualLogic Group Manager Administrator’s Guide for more information.

  NOTE: If snapshot space borrowing is enabled but the volume has no snapshot reserve space configured, you cannot create a Smart Copy. Contact the administrator of the PS Series group if this volume is supposed to support Smart Copy creation.