HP D2D HP D2D Backup System Concepts guide (EH985-90915, March 2011) - Page 39
HP D2D2502: 2 TB 4 x 500 GB; HP D2D2503: 3 TB 4 x 750 GB; HP D2D2504: 4 TB - raid configuration
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Page 39 highlights
NFS NTP R RAID Replication S Storage capacity 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. Network File System (NFS) is a protocol for interfacing to hosts on a Linux or UNIX network. 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. Network Time Protocol (NTP) provides support for automatic time synchronization. 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 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. The physical storage capacity of the HP StoreOnce Backup System 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). • 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 D2D2503: 2.25 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 39
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