User`s guide

B – Glossary
FS0054603-00 C B-3
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Driver (continued) In Red Hat/SuSE Linux, the driver layers include:
■ SCSI Upper Layer. This is the device management
layer. It handles device-dependent tasks for devices,
such as disks and tapes.
■ SCSI Middle Layer. This is the SCSI traffic handling
layer. It directs requests between the kernel and the
SCSI.
■ SCSI Lower Layer. This is the SCSI host bus adapter
driver. It communications directly to the SCSI HBA.
The structure for Solaris SPARC drivers includes:
■ Nexus Drivers. Nexus drivers provide bus mapping
and translation services to subordinate nexus and
leaf devices. These include drivers for PCI-to-PCI
bridges, PCMCIA adapters, and SCSI HBAs.
■ Leaf Drivers. Leaf drivers provide the traditional
character and block driver interfaces for reading and
writing data to storage and communication devices.
These include drivers for peripheral devices,
including QLA200/QLA2xxx HBAs, disks, tapes,
network HBAs, and frame buffers.
Echo diagnostic test This test transmits a received signal back to the sender
to verify the integrity of the device.
Fabric A fabric consists of cross-connected Fibre Channel
devices and switches.
Fabric switch A fabric switch connects multiple devices from
independent Fibre Channel-arbitrated loops (FC-ALs)
and point-to-point topologies into a fabric.
Fast!UTIL QLogic Fast!UTIL FC HBA BIOS utility
FCode FCode is a type of boot code. It is designed for use on
Sun’s SPARC hardware platforms. See Boot code and
OptionROM.
Flash BIOS A QLA2xxx HBA’s flash PROM contains the code that
allows booting from the HBA at startup.