Storage Balancing (Extensible Storage)


Creation Date: November 14, 2007
Revision Date: October 12, 2011
Product: DS-System

Summary

The "Extensible Data Storage" feature allows a DS-System (standalone or N+1) to make use of multiple storage paths at the same time for storing DS-Client data.

"Extensible Data Storage" allows DS-System to grow its capacity by simply adding a new storage location to the list of available locations. Adding new storage can be done easily and without the need of shutting down the DS-System software.

Details

When adding an Extensible Storage Location to a DS-System, you must specify:

The Guard Size for the new Extensible Storage Location should be about 10% of the Total Size. The Total Size minus the Guard Size is the Maximum Size DS-System can write to this Extensible Storage Location.

DS-System balances the data in the Extensible Storage Locations based on the storage fill levels.

Space considerations for individual storage locations

If the DS-System license is over 2 TB, then all DS-System Extensible Storage Locations should be approximately the same size and they should not be less than 2 TB. If the DS-System license is less than 2 TB, then one Extensible Storage Location for the DS-System should be sufficient.

Extensible Storage works at file-level and each file must be saved entirely in the free space existing on that same storage location. This requirement applies for each generation backed up and applies during the reconstruction process as well. DS-System must always have sufficient free space available on a storage location, in order to reconstruct the largest stored file on that location.

See Also



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