IBM Midrange System DS4000 Series Hardware Manual page 22

In terms of intermixing among different hard disk drive technologies, we have the following
supported configurations:
DS5100 and DS5300 storage servers support the intermixing of high performance FC,
high capacity SATA drives, Full Disk Encryption (FDE), and Solid State Drives (SSD)
within single expansion units.
DS5020 storage servers support the intermixing of high performance FC, high capacity
SATA drives, Full Disk Encryption (FDE), and Solid State Drives (SSD) within single
expansion units and even within the controller enclosure as well.
DS4700 storage servers support the intermixing of high performance FC and high
capacity SATA drives within single expansion units and even within the controller
enclosure as well.
Currently, the DS4000 and the DS5000 series supports host connectivity through the
following interfaces:
4 Gbps FC host ports (DS4700, DS5100, and DS5300)
8 Gbps FC host ports (DS5020, DS5100, and DS5300)
1 Gbps iSCSI host ports (DS5020, DS5100, and DS5300)
We briefly describe the characteristics of the four products previously mentioned:
IBM System Storage DS4700 server
The DS4700 storage server is targeted at entry-level to mid-level customers. It can hold a
maximum of 16 disk drives inside the storage server enclosure and can attach up to six
EXP810 Expansion Units for a total of up to 112 Fibre Channel or SATA disk drives.
The DS4700 comes in two models: Model 72 and Model 70. The Model 72 has a total of
eight 4 Gbps FC host ports and 4 GB of cache memory, and the Model 70 has a total of
four 4 Gbps FC host ports and 2 GB of cache memory. Like other DS4000 family
members, the DS4700 supports existing customer infrastructures, helps protect
investments, is a higher performance storage server for open systems.
IBM System Storage DS5020 server
The DS5020 is the newest member of the DS5000 series and is designed to help address
midrange or departmental storage requirements. The DS5020 has a 3U rack-mountable
enclosure, has four 4 Gbps FC drive interfaces, and can consist of a maximum of six
EXP520 expansion units for a total of up to 112 disk drives. Through a specific activation
feature, six EXP810 expansions can be used in place of the EXP520s.
The DS5020 can be configured with 2 or 4 GB of cache memory and different host
connectivity options as listed below:
– Two 8 Gbps FC host ports on each of its two controllers
– Four 8 Gbps FC host ports on each of its two controllers
– Two 8 Gbps FC host ports and, optionally, two 1 Gbps iSCSI on each of its two
controllers
At the time of writing one model is available:
– Model 20A with 8 GB or 16 GB of cache memory and one of the combinations of host
interfaces specified in the list above.
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IBM Midrange System Storage Hardware Guide