SCSI drivers that are built into the kernel are checked in a pre-determined
order to see if HBAs that they can control are present. The user has no
control over this order which in most cases is
arbitrary but in the case of some older ISA adapters is required to stop
misidentification.
scsi_logging=<n>
where <n> is 0 to turn logging off
where <n> is non-zero to turn logging on
max_scsi_luns=<n>
where <n> is a number between 1 and 8
scsihosts=host0:hosts1::host3 |
The recently introduced devfs defines a "scsihosts"
boot time parameter to give the user some control over this. See the
devfs documentation [ref: W5] for a description.
The host names given in the list to the "scsihosts" boot option are
the names of lower level drivers (e.g. "scsihosts=advansys:imm::ide-scsi").
Devfs does not need to be present for "scsihosts" to be used. The
"scsihosts" parameter, if given, is echoed during in the boot up messages.
For example:
scsi: host order: advansys:imm::ide-scsi |
Also if multiple HBA are present in a system then they are scanned in
a fixed order which experience has shown to be safe. The "scsihosts"
parameter only effects how these HBAs are indexed (i.e. which SCSI
adapter numbers are associated with them by the kernel).
A full list of kernel parameters with some explanations can be found
in the file /usr/src/linux/Documentation/kernel-parameters.txt.
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