N
NAS Shares
Devices on HP StoreOnce Backup Systems may be configured as Virtual Tape devices or as NAS
(Network Attached Storage) targets for backup applications. NAS target devices on an HP
StoreOnce Backup System provide network file share access that is optimized for backup to disk
and are referred to as NAS Shares in the Web Management Interface.
All HP StoreOnce devices that are configured for NAS automatically make use of HP deduplication,
ensuring efficient and cost-effective use of disk space.
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.
B6000 (G3) and G2 HP StoreOnce Backup Systems support this interface for connecting to NAS
targets on the HP StoreOnce G2 appliance from a Linux or UNIX network host.
Node
A node is one of the pair of servers that, together with the array storage, make up a couplet.
The two nodes are directly connected in failover pairs. If one node fails, the other node can still
access the storage from the failed node, because there are storage paths from each node to both
controllers of both arrays.
NTP
Network Time Protocol (NTP) provides support for automatic time synchronization.
R
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 B6000 and 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
Service set
The service set is the set of services that run upon a node. These include NAS, VTL, Replication
and other services.
Storage capacity
The physical storage capacity of the HP B6000 StoreOnce Backup System is scalable from 32
TB to 512 TB, depending on how many racks, couplets and expansion shelves are configured
in the cluster.
The physical storage capacity of the HP StoreOnce Backup System G2 and G1 products is:
•
HP D2D2502: 2 TB (4 x 500 GB); HP D2D2503: 3 TB (4 x 750 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).
44
Glossary
