iSeries I/O adapters and controllers 365
Draft Document for Review October 18, 2004 5486IOA.fm
A minimum of three disk units of the same capacity are needed for a valid
RAID-5 configuration. A maximum of four arrays are allowed per controller, with a
maximum of 12 disk units allowed per array. All disk units in an array must be of
the same capacity. Parity is spread across either two, four, or eight disk units in
an array. If an array of three disk units is started, parity is spread across two disk
units. If an array of four to seven disk units is started, parity is spread across four
disk units. If an array of 8 to 12 disk units is started, parity is spread across eight
disk units.
The number of arrays and size of each array can be influenced by specifying an
optimization of either Balance, Performance, or Capacity in Operations Navigator
when starting arrays. An optimization of
Balance is used by default when starting
arrays from the green screens. If disk units are included into an existing array,
parity may be spread across less than the preferred number of disk units. In this
case, you must stop and then start the RAID function to redistribute the parity.
The #5703 can control up to two removable media devices (internal tape,
CD-ROM, DVD-RAM, DVD-ROM).
The #5703 PCI-X RAID Disk Unit Controller is the recommended replacement for
the #2782 PCI-X RAID Disk Unit Controller.
When used as a Direct Attached Adapter, order the #0628 in place of the #5703.
The #0143 Disk Controller Placement Exception is a prerequisite for the #5703.
#5704 PCI-X Fibre Channel Tape Controller
The #5704 PCI-X Fibre Channel Tape Controller provides Fibre Channel
attachment capability for external tape devices. The #5704 supports
point-to-point and arbitrated loop topologies and has an LC-type cable connector.
Each #5704 is shipped with a wrap connector (part number 05N6767). The
#5704 supports 64-bit, 133 MHz PCI-X bus speeds.
The following adapter kits are required when connecting SC-type cables to the
#5704:
#0371 - LC-SC Adapter Kit (50 micron)
Restriction: Due to a system CEC and external tower disk unit cage SCSI
bus designs, only Models 270, 800, and 810, and the #0595/#5095 PCI-X
Expansion Tower have a suitable system configuration to allow 12 disk units to
attach to a single #5703. All other CEC and tower disk configurations restrict
the number of attaching disk units to 10 or less.
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