IBM System Storage DS4000, Hardware Manual

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Chapter 3. IBM System Storage DS4000 and DS5000 hardware
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3.6 DS5000 series product comparison
This section will compare the DS5000 products.
3.6.1 DS5020 product comparison
Take a quick look at the specifications of the DS4700 and DS5020 (Figure 3-69), You see
significant improvements in many areas.
Figure 3-69 DS5020 / DS4700 specification comparison
While the max host ports (8) and drives (112) are the same, the DS5020’s 8 Gbps interfaces
and support for 1 Gbps iSCSI give it the connectivity advantage. The DS5020’s support for
self-encrypting drives (also referred to as FDE for full disk encryption) provide an clear
advantage.
The controller architecture is where we get the performance gains. It has a 80% faster
processor and 300% faster busses. The two items are key contributors to the DS5020’s
performance advantages, which are up to 67% higher.
A vendor neutral company called Storage Performance Council has done a performance test
on the DS5020. The results of this test can be found at the following address:
http://www.storageperformance.org/results
1,600 MB/s
50,000 IOPS
200,000 IOPS
2 GB / 4 GB
8 GB/s
PCI-Express x8 (4 GB/s)
Intel xScale1.2 GHx
112 FC/FDE/SATA
Four 4 Gb/s
Four 8 Gb/s FC; or Eight 8 Gb/s FC; or
Four 8 Gb/s FC & four 1 Gb/s iSCSI
D S 5 0 2 0
60%
25%
67%
300%
80%
980 MB/s
40,000 IOPS
120,000 IOPS
2 GB / 4 GB
2 GB/s
PCI-X (1GB/s)
Intel xScale667MHz
112 FC/SATA
Four 4 Gb/s
Four 4 Gb/s FC; or
Eight 4 Gb/s FC
D S 4 7 0 0
Host interfaces options
Dual-controller system
(unless noted)
Redundant drive channels
Max drives
RAID Processor
Bus Technology
Internal controller bandwidth
Cache memory (min/max)
Cache IOPS
Disk Read IOPS
Disk Read MB/s 1,600 MB/s
50,000 IOPS
200,000 IOPS
2 GB / 4 GB
8 GB/s
PCI-Express x8 (4 GB/s)
Intel xScale1.2 GHx
112 FC/FDE/SATA
Four 4 Gb/s
Four 8 Gb/s FC; or Eight 8 Gb/s FC; or
Four 8 Gb/s FC & four 1 Gb/s iSCSI
D S 5 0 2 0
60%
25%
67%
300%
80%
980 MB/s
40,000 IOPS
120,000 IOPS
2 GB / 4 GB
2 GB/s
PCI-X (1GB/s)
Intel xScale667MHz
112 FC/SATA
Four 4 Gb/s
Four 4 Gb/s FC; or
Eight 4 Gb/s FC
D S 4 7 0 0
Host interfaces options
Dual-controller system
(unless noted)
Redundant drive channels
Max drives
RAID Processor
Bus Technology
Internal controller bandwidth
Cache memory (min/max)
Cache IOPS
Disk Read IOPS
Disk Read MB/s