24 IBM Midrange System Storage Hardware Guide
3.1 IBM System Storage DS4700 Express
The IBM System Storage DS4700 Express storage subsystem (Figure 3-1) uses 4 Gbps
technology (4 Gbps capable drives and the HBAs required to achieve 4 Gbps throughput
speeds). It is designed to handle the most rigorous customer workloads and can expand from
workgroup to enterprise-wide capability with the attachment of six DS4000 EXP810 disk
enclosures. The DS4700 includes 16 disks and offers a fully switched drive-side architecture.
Its RAID controllers use a 667 MHz xScale processor with an embedded high-speed XOR
engine that generates RAID parity with no performance penalty.
Figure 3-1 IBM System Storage DS4700 Express storage subsystem
Designed to excel at input/output operations per second (IOPS) and MBps, the DS4700
Express can work well for both transaction-oriented and bandwidth-intensive applications.
Additionally, the DS4700 Express is a good choice for environments with replication
requirements, because it is designed to handle the performance demands of FlashCopy,
VolumeCopy, and Enhanced Remote Mirroring.
One of the key advantages of the DS4700 Express 4 Gbps technology is that it is backwards
compatible with 2 Gbps and even 1 Gbps technologies. This means that you can avoid
replacing your entire SAN with 4 Gbps technology. You can add new technology
incrementally. The 4 Gbps products will slow down to the 2 Gbps or 1 Gbps speed if they are
connected, but zoning allows you to implement a rolling upgrade strategy with minimal
disruption.
The DS4700 Express Disk System and the EXP810 Storage Expansion Unit offer new
models designed to be powered from a - 48 V dc Telco industry standard power source and
are NEBS-3 compliant. They also include an air filter option with the optional front bezel.
3.1.1 DS4700 features
The available DS4700 models include:
DS4700 Express Model 70 (1814-70A)
– Contains 2 GB of cache memory (1 GB per controller),
– Four 4 Gbps FC host ports (two ports per controller),
DS4700 Express Model 72 (1814-72A)
– Contains 4 GB of cache memory (2 GB per controller),
– Eight 4 Gbps FC host ports (four ports per controller),
Attention: New enhancements for the DS4700 Express models are now available as
Models 70-DC and 72-DC. These new models are designed to be powered from a - 48 V
dc Telco industry standard power source and are NEBS-3 compliant. It also includes an air
filter option with the optional front bezel.
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