Adaptec 5325301656 - Snap Server 14000 NAS, Руководство администратора

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Determining Capacity
Chapter 1 Administrative Overview 15
• The default gateway IP address
• The DNS IP address
• WINS server(s) IP address(es)
Keeping or Reclaiming the Snapshot Space
A Snapshot is a point-in-time image of your volume. This image can be used for
backup or recovery purposes. See “Snapshots” on page 95 for detailed information.
Approximately 20% of the default volume is allocated for snapshot use.
Note
For Snap Servers that require an additional license to activate Snapshots, the
20% is not specifically allocated for Snapshot use, but it is not included in the
default volume.
If you are certain that you will not use snapshots, you can reclaim that space on the
volume by selecting the
Reclaim Snapshot Space
radio button in the Initial Setup
Wizard.
Caution
If you delete the snapshot space at this time (during the volume
configuration process), you will not be able to restore it later if you decide that you
want to use snapshots. Therefore, it is recommended that you retain the snapshot
space during this initial configuration. You can always delete or reduce it from the
Storage > Snapshots
page in the Administration Tool. Or, for servers with no
Snapshots license, you can simply increase your default volume size in the
Storage
> Volumes
page.
Determining Capacity
The factory default configuration reduces potential capacity in order to provide a
high degree of data protection and backup capability. By default, Snap Servers with
four (4) or more disk drives are configured into a RAID 5 created during the
manufacturing process (Snap Server 110 and Snap Server 210 are configured as a 1-
and 2-drive RAID 0, respectively). In a RAID 5 configuration, the capacity of one
drive is used for data protection, reducing the available capacity of the server by
one drive.
The GuardianOS runs from a protected partition, which consumes approximately
10 GB of space from each disk depending on the total capacity of the disk drive.
Approximately 20% of the default RAID is available for snapshot space and 80% of
the default RAID assigned to the primary data volume.
For example, to calculate the capacity of a Snap Server 520 with 1 TB total capacity
in its default state, consider both the hardware and software configuration:
• The four 250 GB disk drives each provide 240 GB of formatted capacity.