Disk Enclosure (Rodrigo); Overview - IBM Power Systems 775 Manual

1.6 Disk enclosure
This section describes the storage disk enclosure for the Power 775 system.

1.6.1 Overview

The Power 775 system features the following disk enclosures:
SAS Expander Chip (SEC):
– # PHYs: 38
– Each PHY capable of SAS SDR or DDR
384 SFF DASD drives:
– 96 carriers with four drives each
– 8 Storage Groups (STOR 1-8) with 48 drives each:
• 12 carriers per STOR
• Two Port Cards per STOR each with 3 SECs
– 32 SAS x4 ports (four lanes each) on 16 Port Cards.
Data Rates:
– Serial Attach SCSI (SAS) SDR = 3.0 Gbps per lane (SEC to Drive)
– Serial Attach SCSI (SAS) DDR= 6.0 Gbps per lane (SAS Adapter in Node to SEC)
The drawer supports 10 K/15 K rpm drives in 300 Gb or 600 Gb sizes.
A Joint Test Action Group (JTAG) interface is provided from the DC converter assemblies
(DCAs) to each SEC for error diagnostics and boundary scan.
Important: STOR is the short name for storage group (it is not an acronym).
The front view of the disk enclosure is shown in Figure 1-39 on page 49.
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IBM Power Systems 775 for AIX and Linux HPC Solution