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Hardware for Shared Storage
5-3
Storage System Hardware
Hardware for Shared Storage
The primary hardware component for shared storage is a ten-slot
Disk-array Processor Enclosure (DPE) with two storage processors
(SP). The DPE can support up to nine separate 10-slot enclosures
called Disk Array Enclosures (DAEs) for a total of 100 disks. Shared
storage requires two SPs and the Access Logix software option.
A DPE with a DAE is available as a deskside system, but with a
capacity of 20 disks this cannot provide the expandability and total
storage capacity needed for a SAN (storage area network). So this
section does not cover the deskside version.
Storage Hardware — Rackmount DPE-Based Storage Systems
The DPE rackmount enclosure is a sheet-metal housing with a front
door, a midplane, and slots for the storage processors (SPs), link
control cards (LCCs), disk modules, power supplies, and fan packs.
All components can be replaced under power. The DPE rackmount
model looks like the following figure.
Figure 5-2 DPE Storage-System Components – Rackmount Model
A separate standby power supply (SPS) is required to support write
caching. All the shared storage components — rackmount DPE,
DAEs, SPSs, and cabinet — are shown in the following figure.
Back
Power supplies
Storage processors (SPs)
Drive fan module
(detached for clarity)
Link control
card (LCC)
LCC
Disk modules (front door
removed for clarity)
Front
FC ports with GBICs