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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
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