For PCIe-attached adapters with four or eight 8 Gbps Fibre Channel ports,
each port can be independently configured to use SCSI/FCP, SCSI/FC-AL,
or FICON/zHPF protocols. For PCIe-attached adapters with 4 16 Gbps
Fibre Channel ports, each port can be independently configured to use
SCSI/FCP or FICON/zHPF protocols. Both longwave and shortwave
adapter versions that support different maximum cable lengths are
available. The host-adapter ports can be directly connected to attached
hosts systems or storage systems, or connected to a storage area network.
SCSI/FCP ports are used for connections between storage systems.
SCSI/FCP ports that are attached to a SAN can be used for both host and
storage system connections.
The High Performance FICON Extension (zHPF) protocol can be used by
FICON host channels that have zHPF support. The use of zHPF protocols
provides a significant reduction in channel usage. This reduction improves
I/O input on a single channel and reduces the number of FICON channels
that are required to support the workload.
Power
The power system in each frame is a pair of direct-current uninterruptible power
supplies (DC-UPSs) with internal batteries. The DC-UPSs distribute rectified AC
power and provide power switching for redundancy. A single DC-UPS has
sufficient capacity to power and provide battery backup to the entire frame if one
DC-UPS is out of service. DS8880 uses three-phase and single-phase power.
There are two AC-power cords, each feeding one DC-UPS. If AC power is not
present at the input line, the output is switched to rectified AC power from the
partner DC-UPS. If neither AC-power input is active, the DC-UPS switches to 180
V DC battery power. Storage systems that have the extended power line
disturbance (ePLD) option are protected from a power-line disturbance for up to 40
seconds. Storage systems without the ePLD option are protected for 4 seconds.
An integrated pair of rack-power control (RPC) cards manages the efficiency of
power distribution within the storage system. The RPC cards are attached to each
processor node. The RPC card is also attached to the primary power system in
each frame.
Functional overview
The following list provides an overview of some of the features that are associated
with DS8880.
Note: Some storage system functions are not available or are not supported in all
environments. See the IBM System Storage Interoperation Center (SSIC) website
(www.ibm.com/systems/support/storage/config/ssic) for the most current
information on supported hosts, operating systems, adapters, and switches.
Nondisruptive and disruptive activities
DS8880 supports hardware redundancy. It is designed to support
nondisruptive changes: hardware upgrades, repair, and licensed function
upgrades. In addition, logical configuration changes can be made
nondisruptively. For example:
v The flexibility and modularity means that expansion frames can be
added and physical storage capacity can be increased within a frame
without disrupting your applications.
Chapter 1. Overview 23
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