Chapter 1: System Description
Drive Storage
Quantum DXi6900 User’s Guide 24
Figure5:DXi6900 System
1.DXi6900Node  2.ArrayModule(RBOD)/ExpansionModule(EBOD)  
Drive Storage
The DXi6900 system is based upon high speed disk drives instead of tape drives (see HDDs on the next
page). The usable capacity is 17–510 TB.
The DXi6900-S system is based upon solid state drives in the Node (see SDDs on page 27) and high speed
disk drives in the Array and Expansion Modules (see HDDs on the next page). The usable capacity is 34–
544 TB.
The DXi6900 can present its drive storage using multiple protocols:
l Virtual Tape Storage on page 28
l Network Attached Storage (NAS) on page 29
l OpenStorage (OST) on page 31
By making use of high speed drives, the DXi6900 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: