IBM Midrange System DS4000 Series Hardware Manual page 48

Supports RAID 0, 1, 3, 5, 6, and 10 (RAID 1+0).
Supports RAID 1 and 10 dedicated mirrored drive pairs configurations.
The ability to create a RAID 10 or 0 group on all available drives to maximize performance
for a LUN.
Flexible host interface modules can be added, changed, or mixed as the infrastructure
changes. The quad-4 Gbps Fibre Channel (FC) Host Interface Cards (HIC) can be
replaced now with quad-8 Gbps FC HIC or dual-1 Gbps iSCSI Host Interface Card. Field
replacements (MES) are available.
Supports an unlimited number of Global Hot Spare drives with the ability to enable/disable
the copy back function (important for SATA drives).
Supports eight host-side connections (two HICs) per controllers on both models.
Host-side connections support
– Fibre Channel Switched Fabric
– Arbitrated Loop and Fibre Channel Direct Connections
– Ethernet Direct Connection and Ethernet Switched Network (with iSCSI HIC)
Supports sixteen 4 Gbps drive-side connections for both controllers. This allows a total of
eight dual-redundant drive channel pairs to be implemented to support expansion
enclosure additions.
Redundant drive-side connections are designed to avoid any single-point of failure and
maintain high availability.
Supports up to 28 EXP5000s (or a mix of EXP5000s and EXP810s for migration
purposes) for a total of 448 disks. This will allow you to install up to 448 TB of raw capacity
with 1 TB SATA disks or 268 TB of raw capacity with FC drives or mixed.
Supports a maximum of 20 Solid State Drives (SSDs) within EXP5000.
Fully supports Fibre Channel/SATA intermix (premium feature) by allowing the
simultaneous usage of SATA and Fibre Channel behind one DS5000 controller, allowing
user flexibility and increased storage capacity utilization. It is also possible to mix disks of
different size and technology inside one enclosure.
Supports up to 512 host storage partitions that isolate LUNs for different servers or groups
of servers.
Supports up to 2048 volumes.
Supports up to 2048 host logins.
Supports 4096 command queue depth (maximum drive queue depth is 16).
Supports logical volumes greater than 2 TB (when required and supported by the
operating system).
Supports shortwave Fibre Channel 4 and 8 Gbps host attachment.
Supports 1 Gbps copper iSCSI host attachment.
Multiple heterogeneous server and operating system support (host kits required).
Powerful On Demand functions: Dynamic Volume Expansion, Dynamic Capacity
Expansion, and Dynamic RAID Level Migration. Dynamic Segment Size allows users to
modify storage configurations on-the-fly without incurring any downtime.
Remote Service Manager notifies IBM if there is an issue. see Chapter 6, "IBM Remote
Support Manager for Storage" on page 285 for more details.
New dual 10/100/1000 Ethernet for out-of-band management to separate out-of-band
management from service diagnostics for each controller.
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IBM Midrange System Storage Hardware Guide