POWER7 information

RAID controller location code

The RAID controllers are embedded on the enclosure RAID module (ERM) card and connect to the system by using a PCIe cable. All I/O controllers or adapters attached by a PCIe bus on Power Systems servers inherit the location code of the I/O slot to which they connect.

Generally, the location code of an I/O slot is based on the enclosure in which the nearest upstream PCI bridge resides. This is normally a PCI slot, but for a RAID controller in an ERM, it is where the PCIe cable is connected on the GX adapter in the system unit. Therefore, the logical PCIe slot location code for the RAID controller is associated with the PCIe cable connector location on the GX adapter in the system. This logical location code (L1 in the following example) indicates that the associated RAID controller resource connects to the connector.

The logical PCIe slot location of the RAID controller in an ERM is shown in the following form:

Utttt.mmm.sssssss-Pw-Cx-Ty-L1 (-T1), where:

Utttt.mmm.sssssss is the type, model, and serial number of the system central electronics complex (CEC) enclosure in which the GX adapter resides
Pw is the planar in the system CEC enclosure that the GX adapter plugs into
Cx is the slot on the planar that the GX adapter plugs into
Ty is the PCIe connector on the GX adapter
L1 is the logical RAID controller indicator
T1 might be appended after L1 in some cases, but can be ignored

The slot location code previously described is used to call out failures that are isolated to the RAID controller or PCIe hardware in the PCIe storage enclosure. The physical location code of the ERM card is used to call out failures that are isolated to other components on the ERM card. The components can include the serial-attached SCSI (SAS) expander or the SCSI enclosure services (SES) device.

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Last updated: Thu, October 10, 2013