4405ch02 Architecture and technical overview.fm Draft Document for Review May 28, 2009 1:59 pm
48 IBM Power 570 Technical Overview and Introduction
Table 2-12 Asynchronous PCI-X adapters
In many cases, the FC 5723 asynchronous adapter is configured to supply a backup HACMP
heartbeat. In these cases, a serial cable (FC 3927 or FC 3928) must be also configured. Both
of these serial cables and the FC 5723 adapter have 9-pin connectors.
2.8.7 Additional support for existing PCI adapters
The lists of the major PCI adapters that you can configure in a 570 when you build an
available configuration are described in 2.8.1, “LAN adapters” on page 44 through 2.8.6,
“Asynchronous PCI adapters” on page 47. The list of all the supported PCI adapters, with the
related support for additional external devices, is more extended.
If you would like to use PCI adapters you already own, contact your IBM service
representative to verify whether those adapters are supported.
2.9 Internal storage
The 570 internal disk subsystem is driven by the latest DASD interface technology Serial
Attached SCSI (SAS). This interface provides enhancements over parallel SCSI with its point
to point high frequency connections. The SAS controller has eight SAS ports, four of them are
used to connect to the DASD drives and one to a media device.
The DASD backplane implements two SAS port expanders that take four SAS ports from the
SAS controller and expands it to 12 SAS ports. These 12 ports allow for redundant SAS ports
to each of the six DASD devices.
The DASD backplane provides the following functions :
supports six 3.5 inches SAS DASD devices
contains two SAS port expanders for redundant SAS paths to the SAS devices
SAS passthru connection to medias backplane
2.9.1 Integrated RAID options
The 570 supports a 6-pack DASD backplane attached to the system planar. To support RAID
functionality a combination of additional adapters is required. At the time of writing RAID level
0 and 10 are supported using adapter FC 5900 or 5909 and FC 3650 or FC 3651 as
described in Table 2-13.
Table 2-13 Raid support
Feature code Description Slot Size
2943 8-Port Asynchronous Adapter EIA-232/RS-422 PCI-X Short
5723 2-Port Asynchronous IEA-232 PCI Adapter PCI-X Short
Feature Description
3650 + 5900 or 5909 A hardware feature that occupies PCIe slot P1C3 provides a mini
SAS 4x connector to the rear bulkhead and allows three of the
internal SAS drives ( disk 4,5,6) to be controlled using an external
SAS controller.
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