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4 : Concepts OneBlox 4312 User Guide
Understanding OneBlox and OneSystem
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going offline, the other site has additional copies of the information and users can access the
information from the alternate ring.
4.2.3 - How to Increase the Storage Capacity
OneBlox provides the ability to dynamically grow the size of the ring in a number of ways.
Individual drives can be added to a single OneBlox if there are available drive bays. Alternatively,
an existing drive in OneBlox can be removed and replaced with a larger capacity drive.
In addition to drive growth, additional OneBlox can be added. This is a similar process to the first
OneBlox addition, but simpler. Refer to Chapter 1, “ Quick Start ” on page 7 for OneBlox installation.
If the OneBlox is added to the same LAN as an existing OneBlox, it will dynamically join the
existing OneBlox(s) and the single file system accessible by applications and users now have
access to the capacity of the new OneBlox without any configuration changes.
4.2.4 - Space Savings
OneBlox efficiently stores information in OneBlox. Every file written to OneBlox is deduplicated.
Every file, and every portion of a file that is written is compared to files already stored on OneBlox.
If the same file (or portion) is already stored a duplicate is not written to OneBlox. This
dramatically improves the amount of usable capacity available to applications and users.
In addition to the information being deduplicated, the snapshots are also deduplicated resulting in
further increases in usable capacity.
4.3 - Storage Capacity Reporting through OneSystem
4.3.1 - Used Capacity
Used storage capacity is the amount of storage (or capacity) that has been consumed by
applications and/or users when data protection is taken into account. As OneBlox creates three
replicas of the information, the used capacity increases accordingly. With data deduplication, the
available storage capacity is typically increased with object-based global deduplication.
4.3.2 - Free Capacity
Free capacity is the amount of storage (or capacity) that is available to applications and/or users.
This value does not take into account data protection or deduplication. For example, if there is
6TBs of free capacity and an application writes 1TB of 100% unique data (resulting in zero
deduplication), the free capacity will be reduced to approximately 3TB. (There are three copies of
the 1TB of data to protect against two drive or two OneBlox failures.)
4.3.3 - Raw Capacity
Raw storage capacity is the total capacity installed in the OneBlox Ring. The raw capacity accounts
for the OneBlox filesystem and will be slightly less than the 'unformatted drive capacity' seen in
each OneBlox view of OneSystem. Raw capacity will be greater than the available storage capacity
that is presented to applications and users.
4.3.4 - Unformatted Drive Capacity
Unformatted drive capacity is the sum of the capacity of each drive in OneBlox and does not
account for any OneBlox filesystem formatting or overhead.