Mail slots (import/export elements)
A mail slot is a term borrowed from tape terminology to identify a dedicated slot that is used specifically
to import and export cartridges. They are sometimes called import/export elements by backup
applications. Backup applications that support this feature move cartridges from the mail slot when
the user runs an Export job, and look for cartridges in the mail slot when the user runs an Import job.
Physical tape drives
A physical tape drive is a tape drive that is attached to the HP D2D Backup System or the host
computer, so that data can be moved from the HP D2D Backup System and stored offsite. (It should
not be confused with the tape drive device that is attached to the library device on the HP D2D Backup
System (see “Devices (Configuration)” on page 110.)
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 D2D 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.The unit also has an online spare disk in bay 12, which further enhances the reliability
of the product. If one disk fails, the online spare disk immediately takes its place. The failed disk
should always be replaced as soon as possible.
Replication
Replication is a standard term used to describe a way of synchronizing data between hardware in
two physical locations. HP D2D Replication allows users to replicate data from cartridges on one HP
D2D Backup System to mapped slots on another HP D2D 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 D2Ds. Deduplication ensures that network traffic is
minimized. See also “Configuring and using replication” on page 75.
Tape Attach
If you attach a supported, physical tape library or tape drive directly to your HP D2D Backup System,
you will be able to copy or export data to the physical tape library or tape drive so that backups can
be stored offsite. This is an important requirement for Disaster Recovery strategies. The main difference
between copy and export is that copied data remains on the HP D2D Backup System; exported data
is removed from it, but can be imported easily when required. These functions are grouped under the
Tape Attach section of the Web Interface. Please see “Using Tape Attach” on page 147 for more
details about working with Tape Attach.
Storage capacity
Physical storage
The physical storage capacity of the HP D2D Backup System is 12 TB (12 x 1 TB) or 24 TB (24 x 1
TB).
D2D Backup System HP D2D4112 25
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