Dell PowerVault DR2000v - Manual (Page 27)

– Restore
– Replication
DR Series System (DR4X00/DR6000) and Data Operations
Data is stored and resides on the Dell DR Series system (DR4X00/DR6000), a two-rack unit (RU) appliance, which comes
preinstalled with the system software.
The DR Series system consists of a total of 14 drives. Two of these drives are 2.5-inch drives that are configured as a
Redundant Array of Independent Disks (RAID) 1 on the RAID Controller and this is considered to be volume 1. In the
DR4000 system, these drives are internal, while in the DR4100 and DR6000 systems, these drives are accessible from the
rear. The data that is being backed up is stored on the 12 virtual disks that reside on the DR Series system appliance.
The DR Series system also supports additional storage in the form of external expansion shelf enclosures (see the
DR
Series Expansion Shelf section in this topic). The hot-swappable data drives that are attached to the RAID controller are
configured as:
• 11 drives that operate as RAID 6, which act as virtual-disks for data storage (drives 1–11).
• The remaining drive (drive 0) acts as the dedicated hot-spare drive for RAID 6 for the system.
The DR Series system supports RAID 6, which allows the appliance to continue read and write requests to the RAID
array virtual disks even in the event of up to two concurrent disk failures, providing protection to your mission-critical
data. In this way, the system design supports double-data drive failure survivability.
If the system detects that one of the 11 virtual drives has failed, then the dedicated hot spare (drive slot 0) becomes an
active member of the RAID group. Data is then automatically copied to the hot spare as it acts as the replacement for
the failed drive. The dedicated hot spare remains inactive until it is called upon to replace a failed drive. This scenario is
usually encountered when a faulty data drive is replaced. The hot spare can act as replacement for both internal
mirrored drives and the RAID 6 drive arrays.
Figure 1. DR Series System Drive Slot Locations
Drive 0 (top) Drive 3 (top) Drive 6 (top) Drive 9 (top)
Drive 1 (middle) Drive 4 (middle) Drive 7 (middle) Drive 10 (middle)
Drive 2 (bottom) Drive 5 (bottom) Drive 8 (bottom) Drive 11 (bottom)
DR Series Expansion Shelf
Each DR Series system appliance supports the installation and connection of Dell PowerVault MD1200 data storage
expansion shelf enclosures. Each expansion shelf contains 12 physical disks in an enclosure, which provides additional
data storage capacity for the basic DR Series system. The supported data storage expansion shelves can be added in a
variety of capacities based on your DR Series system version; for details, see the
Dell DR Series System Interoperability
Guide .
The physical disks in each expansion shelf are required to be Dell-certified Serial Attached SCSI (SAS) drives, and the
physical drives in the expansion shelf uses slots 1–11 configured as RAID 6, with slot 0 being a global hot spare (GHS).
When being configured, the first expansion shelf is identified as Enclosure 1 (in the case where two enclosures are
added, these would be Enclosure 1 and Enclosure 2). Adding an expansion shelf to support the DR Series system
requires a license. For more information, see
Expansion Shelf Licenses .
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