Ds5000 Series Product Comparison; Ds5020 Product Comparison - IBM Midrange System DS4000 Series Hardware Manual

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.
Dual - controller system Dual - controller system
(unless noted) (unless noted)
Host interfaces options Host interfaces options
Redundant drive channels Redundant drive channels
Max drives Max drives
RAID Processor RAID Processor
Bus Technology Bus Technology
Internal controller bandwidth Internal controller bandwidth
Cache memory (min/max) Cache memory (min/max)
Cache IOPS Cache IOPS
Disk Read IOPS Disk Read IOPS
Disk Read MB/s Disk Read MB/s
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
D S 4 7 0 0 D S 4 7 0 0
Four 4 Gb/s FC; or Four 4 Gb/s FC; or
Eight 4 Gb/s FC Eight 4 Gb/s FC
Four 4 Gb/s Four 4 Gb/s
112 FC/SATA 112 FC/SATA
80% 80%
Intel xScale667MHz Intel xScale667MHz
PCI-X (1GB/s) PCI-X (1GB/s)
300% 300%
2 GB/s 2 GB/s
2 GB / 4 GB 2 GB / 4 GB
67% 67%
120,000 IOPS 120,000 IOPS
25% 25%
40,000 IOPS 40,000 IOPS
60% 60%
980 MB/s 980 MB/s
Chapter 3. IBM System Storage DS4000 and DS5000 hardware
D S 5 0 2 0 D S 5 0 2 0
Four 8 Gb/s FC; or Eight 8 Gb/s FC; or Four 8 Gb/s FC; or Eight 8 Gb/s FC; or
Four 8 Gb/s FC & four 1 Gb/s iSCSI Four 8 Gb/s FC & four 1 Gb/s iSCSI
Four 4 Gb/s Four 4 Gb/s
112 FC/FDE/SATA 112 FC/FDE/SATA
Intel xScale1.2 GHx Intel xScale1.2 GHx
PCI-Express x8 (4 GB/s) PCI-Express x8 (4 GB/s)
8 GB/s 8 GB/s
2 GB / 4 GB 2 GB / 4 GB
200,000 IOPS 200,000 IOPS
50,000 IOPS 50,000 IOPS
1,600 MB/s 1,600 MB/s
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