284 iSeries and AS/400e System Builder
#2757 #2757 PCI-X Ultra RAID Disk Controller
The #2757 PCI-X Ultra RAID Disk Controller is an Ultra SCSI controller with a maximum write cache size of 235 MB (757MB
compressed) that provides RAID-5 protection for internal disks and also supports internal tape units, CD-ROM, and DVD
units. The #2757 has four Ultra4 SCSI buses.
In addition to providing RAID-5 protection for disks, the #2757 PCI-X Ultra RAID Disk Controller is designed to work as a
high performance controller for disks protected by system mirroring or disks with no protection.
The #2757 PCI-X Ultra RAID Disk Controller supports a maximum of 20 disk units. A minimum of three disk units of the
same capacity are needed for a valid RAID-5 configuration. A maximum of six arrays are allowed per controller, with a
maximum of 18 disk units allowed per array. All disk units in an array must be of the same capacity. Parity is spread across
either 2, 4, 8, or 16 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 8-15 disk units is started,
parity is spread across eight disk units. If an array of 16-18 disk units is started, parity is spread across 16 disk units.
Availability is the number of arrays and size of each array can be influenced by specifying an optimization of either
Balance, Performance, or Capacity in iSeries Navigator when starting arrays. An optimization of Balance is used by default
when starting arrays from DST or SST options. If disk units are included into an existing array, parity can be spread across
less than the preferred number of disk units. In this case, the RAID function must be stopped and then started to redistribute
the parity.
The #2757 controls up to two removable media devices (internal tape, CD-ROM, and DVD).
The #2757 does not support DASD compression.
System unit or tower disk configurations restrict the number of attaching disk units to 15 or less.
Minimum operating system level: OS/400 V5R2
The #2757 is a Customer Install Feature
#2763 #2763 PCI RAID Disk Unit Controller
The #2763 is an Ultra2 SCSI controller with a 10 MB write-cache that provides RAID-5 protection for internal disk units and
supports up to two removable media devices (internal tape units and CD-ROM units). In addition to providing RAID-5
protection for disks, the #2763 is also designed to work as a high performance controller for disks protected by system
mirroring or disks with no protection. The #2763 controller supports a maximum of 12 disk units and is only supported on
the Model 820, #5075 PCI Expansion Tower, and supported on the #0595/#5095.
A minimum of four disk units of the same capacity are needed for a valid RAID-5 configuration. A maximum of three arrays
are allowed per controller, with a maximum of 10 disk units allowed per one array. All disk units in an array must be of the
same capacity. Parity is spread across four disk units for arrays of four to 10. The #2763 does not support hardware disk
compression. The #2763 does not support the #4331 1.6 GB Read Cache Device.
The #2763 can be attached directly to a Linux partition. When ordered as #0604 - Direct Attach - #2763 PCI RAID Disk
Unit Controller, an IOP is not required. When attached directly to a Linux partition, the #2763 cannot be accessed by
OS/400 partitions. When attached directly to a Linux partition, the #2763 does not support RAID or hardware disk
compression.
Requires long PCI card slot.
Minimum operating system level: OS/400 V4R5
The #2763 is a Customer Install Feature.
The #2763 was withdrawn from marketing on 21 November 2003 for new orders. Conversions to feature #2763 remain
available. The #5703 PCI-X RAID Disk Unit Controller is the recommended replacement.
#2765 #2765 PCI Fibre Channel Tape Controller
The #2765 provides Fibre Channel attachment capability for external tape devices. The #2765 supports point-to-point and
arbitrated loop topologies and has an LC type cable connector. Each #2765 is shipped with a wrap connector (P/N
05N6767).
The devices supported for Fibre Channel attachment are:
3534-1RU SAN Fibre Channel Managed Hub (1 Gbps)
Fibre Channel Switches:
– 2031-224 McDATA Sphereon 4500 Fabric Switch
– 2031-232 McDATA Sphereon 3232 Fabric Switch
– 2109 S08/S16 (1 Gbps)
– 2109 F16 (2 Gbps)
– 3534 F08 (2 Gbps)
