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Any DAE2 can support up to fifteen 3.5-inch disk modules. Simple
serial cabling provides easy scalability. You can interconnect DAE2s
to Fibre Channel loops (sometimes called busses) to form a large disk
storage system; the number and size of loops depends on the
capabilities of your storage processor. Highly available
configurations require at least one pair of physically independent
loops (A and B sides of Loop 0, sharing the same dual-port disks).
Other configurations use two, three, or four loops. You can place the
disk enclosures in the same cabinet, or in one or more separate
cabinets. High-availability features are standard.
The DAE2 includes the following components:
A sheet-metal enclosure with a midplane and front bezel
Two link control cards (LCCs)
As many as 15 disk modules
Two power supply/system cooling modules
The power supply and system cooling components of the power/cooling
modules function independently of each other, but the assemblies are
packaged together into a single field-replaceable unit (FRU).
Any unoccupied disk module slot has a filler module to maintain air
flow.
The LCCs, disk modules, power supply/system cooling modules,
and filler modules are field-replaceable units (FRUs), which you can
add or replace without tools while the array is powered up.
Standard DAE2 disk modules are FC-AL compliant and support
dual-port FC-AL interconnects through the two LCCs and their
cabling. ATA disk modules include dual-port ATA interconnects; the
FC-to-ATA link control cards provide the bridge between Fibre
Channel and ATA signals.
You can integrate and connect FC and ATA enclosures within a storage
system, but you cannot mix ATA and fibre components within a DAE2.
Standard link control cards will not recognize ATA disk drives, and ATA link
control cards will not recognize Fibre Channel disks.
The system can continue running with one operating power supply
and a single functional LCC. At least three of the four system cooling
blowers must be running correctly for continuous operation.
Figures 1-2 through 1-4 show the disk enclosure components. Details
on each component accompany the figures. Where the enclosure
About DAE2 Disk Enclosures
Introduction
1-3
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