HP StoreOnce Backup - Manual (Page 169)

It is important to understand that the HP StoreOnce network share is intended to be used ONLY
by backup applications that “back up to disk”. Do not use the device as a drag-and-drop general
file store.
NFS Network File System (NFS) is a protocol for interfacing to hosts on a Linux or UNIX network. The
HP StoreOnce Backup System supports this interface for connecting to NAS targets on the HP
StoreOnce appliance from a Linux or UNIX network host.
NTP Network Time Protocol (NTP) provides support for automatic time synchronization. See also
Page 86 .
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RAID RAID stands for Redundant Array of Inexpensive (or Independent) Devices, which is a data storage
scheme that divides data among multiple hard drives, increasing data reliability and throughput.
The HP D2D2500 Series Backup System is a RAID 5 device. It has four disks, but if one of the
disks fails, no data is lost and the HP StoreOnce Backup System continues to operate correctly.
The HP D2D4100/4300 Series Backup System is a RAID 6 device, which offers the best
combination of data protection and capacity for disk arrays. It provides protection against double
disk failures and failures while a single disk is rebuilding. HP D2D4100 and 4300 Series Backup
Systems also have an online spare disk (in the appliance itself and on each expansion shelf),
which further enhances the reliability of the product. If one disk fails, the online spare disk
immediately takes its place.
Replication Replication is a standard term used to describe a way of synchronizing data between hardware
in two physical locations. HP StoreOnce Replication allows users to replicate data from cartridges
on one HP StoreOnce Backup System to mapped slots on another HP StoreOnce Backup System
on a remote site or the same system. Once configured (using the simple-to-use wizard), replication
occurs automatically, ensuring data is mirrored from the source to the target HP StoreOnce Backup
Systems. Deduplication ensures that network traffic is minimized. See also the HP StoreOnce
Backup System Concepts Guide.
S
Storage capacity The physical storage capacity of the HP StoreOnce Backup System is:
•
HP D2D2502: 2 TB (4 x 500 GB); HP D2D2504: 4 TB (4 x 1 TB)
•
HP D2D4106: 6 TB (12 x 500 GB). One additional shelf may be connected to the unit,
which increases the total capacity to 12 TB (24 x 500 GB).
•
HP D2D4112: 12 TB (12 x 1 TB). One additional shelf may be connected to the unit, which
increases the total capacity to 24 TB (24 x 1 TB).
•
HP D2D4312: 12 TB (12 x 1 TB). Up to three additional shelves may be connected to the
unit, which increases the total capacity to 48 TB (48 x 1 TB)
•
HP D2D4324: 24 TB (12 x 2 TB). Up to three additional shelves may be connected to the
unit, which increases the total capacity to 96 TB (48 x 2 TB)
However, in order to ensure a high level of data integrity, the disks use RAID protection. This
reduces the available capacity but ensures that, in the event of a disk failure in the device, there
will be no data loss.
Actual storage capacity is approximately:
•
HP D2D2502: 1.5 TB; HP D2D2504: 3 TB
•
HP D2D4106: 4.5 TB, or 9 TB, if an extra shelf is installed
•
HP D2D4112: 9 TB, or 18 TB, if an extra shelf is installed
•
HP D2D4312: 9 TB, up to a maximum of 36 TB with three extra shelves installed
•
HP D2D4324: 18 TB, up to a maximum of 72 TB with three extra shelves installed
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