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-SCSI subsystem documentation
-The Linux Documentation Project (LDP) maintains a document describing
-the SCSI subsystem in the Linux kernel (lk) 2.4 series. See:
- . The LDP has single
-and multiple page HTML renderings as well as postscript and pdf.
-It can also be found at:
-Notes on using modules in the SCSI subsystem
-The scsi support in the linux kernel can be modularized in a number of
-different ways depending upon the needs of the end user. To understand
-your options, we should first define a few terms.
-The scsi-core (also known as the "mid level") contains the core of scsi
-support. Without it you can do nothing with any of the other scsi drivers.
-The scsi core support can be a module (scsi_mod.o), or it can be built into
-the kernel. If the core is a module, it must be the first scsi module
-loaded, and if you unload the modules, it will have to be the last one
-unloaded. In practice the modprobe and rmmod commands (and "autoclean")
-will enforce the correct ordering of loading and unloading modules in
-the SCSI subsystem.
-The individual upper and lower level drivers can be loaded in any order
-once the scsi core is present in the kernel (either compiled in or loaded
-as a module). The disk driver (sd_mod.o), cdrom driver (sr_mod.o),
-tape driver ** (st.o) and scsi generics driver (sg.o) represent the upper
-level drivers to support the various assorted devices which can be
-controlled. You can for example load the tape driver to use the tape drive,
-and then unload it once you have no further need for the driver (and release
-the associated memory).
-The lower level drivers are the ones that support the individual cards that
-are supported for the hardware platform that you are running under. Those
-individual cards are often called Host Bus Adapters (HBAs). For example the
-aic7xxx.o driver is used to control all recent SCSI controller cards from
-Adaptec. Almost all lower level drivers can be built either as modules or
-built into the kernel.
-** There is a variant of the st driver for controlling OnStream tape
- devices. Its module name is osst.o .