Storage Balancing (Extensible Storage)
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 path of the new storage location;
- the Total Size reserved for the Extensible Storage Location;
- the Guard Size for the Extensible Storage location;
- the number of files that can be sent to the new location; and
- the storage group to which the Extensible Storage Location belongs.
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.
- As soon as a storage location reaches a storage fill level, DS-System will send data to other storage locations that are at a lower fill level.
- DS-System only balances the data across Extensible Storage Locations belonging to the same Storage Group.
- DS-System does not balance the data based on the Disk Space available; it balances the data based on the DS-System extensible 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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