Chapter 1: System Description
Hard Drive Storage
Quantum DXi4700 User’s Guide 22
Note: Usable storage capacity can be upgraded at any time after purchase by adding a storage
capacity upgrade license to enable installed hardware capacity, or by adding additional hardware
capacity to the system. For information about upgrade options, see the DXi4700 Capacity Upgrade
Guide (6-68107), or contact your Quantum sales representative.
Figure 4: DXi4700 System
1. DXi4700 Node 2. Array Module (RBOD)/Expansion Module (EBOD)
Hard Drive Storage
The DXi4700 system is based upon high speed disk drives instead of tape drives (see HDDs on the next
page). The usable capacity is 5–135 TB.
l DXi4700 VTL configurations present the drive storage area as VTL partitions (see Virtual Tape Storage
on page 24).
l DXi4700 NAS configurations present the drives storage area as NAS shares and/or OST LSUs (Logical
Storage Units) (see Network Attached Storage (NAS) on page 25 or OpenStorage (OST) on page 26).
l DXi4700 Multi-Protocol configurations present the drive storage area as VTL partitions (see Virtual Tape
Storage on page 24), NAS shares, or OST LSUs (Logical Storage Units) (see Network Attached
Storage (NAS) on page 25 or OpenStorage (OST) on page 26).
By making use of high speed drives, the DXi4700 greatly reduces the time required for backup/restore
functions and improves confidence in completing the backup in the time allowed.
DXi Usage Scenarios
DXi storage presentations are optimized for backup usage rather than file sharing. Backup application
usage is typically characterized by:
l Aggregated name spaces and file contents.
l Limited direct, active file access.
l Limited browsing, scanning, or stating.
l Limited metadata manipulation (including rename).
Usage diverging from these characteristics must be qualified to ensure acceptable behavior with respect to
functionality, performance, replication, and recovery.
Note: Using Backup Exec with GRT (Granular Recovery Technology) over CIFS is not recommended
usage. GRT requires frequently overwriting portions of and appending data to existing files, which is
inconsistent with the DXi usage scenarios. Instead, Quantum recommends using OST.
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