Using a tape drive on a CCISS controller

Per the cciss.txt documentation:

You must enable “SCSI tape drive support for Smart Array 5xxx” and
“SCSI support” in your kernel configuration to be able to use SCSI
tape drives with your Smart Array 5xxx controller.

Please read your /usr/src/linux-2.4/Documentation/cciss.txt as it provides exact instructions on enabling access to the tape drive.

If your cciss.txt does not mention tape drives (search for the word “tape”) then you need a newer kernel (or newer cciss driver).

Here is an excerpt from one version of the cciss.txt document:

 SCSI tape drive and medium changer support
------------------------------------------

SCSI sequential access devices and medium changer devices are supported and
appropriate device nodes are automatically created. (e.g.
/dev/st0, /dev/st1, etc. See the "st" man page for more details.)
You must enable "SCSI tape drive support for Smart Array 5xxx" and
"SCSI support" in your kernel configuration to be able to use SCSI
tape drives with your Smart Array 5xxx controller.

Additionally, note that the driver will not engage the SCSI core at init
time. The driver must be directed to dynamically engage the SCSI core via
the /proc filesystem entry which the "block" side of the driver creates as
/proc/driver/cciss/cciss* at runtime. This is because at driver init time,
the SCSI core may not yet be initialized (because the driver is a block
driver) and attempting to register it with the SCSI core in such a case
would cause a hang. This is best done via an initialization script
(typically in /etc/init.d, but could vary depending on distibution).
For example:

for x in /proc/driver/cciss/cciss[0-9]*
do
echo "engage scsi" > $x
done

Once the SCSI core is engaged by the driver, it cannot be disengaged
(except by unloading the driver, if it happens to be linked as a module.)

Note also that if no sequential access devices or medium changers are
detected, the SCSI core will not be engaged by the action of the above
script.

Hot plug support for SCSI tape drives
-------------------------------------

Hot plugging of SCSI tape drives is supported, with some caveats.
The cciss driver must be informed that changes to the SCSI bus
have been made, in addition to and prior to informing the the SCSI
mid layer. This may be done via the /proc filesystem. For example:

echo "rescan" > /proc/scsi/cciss0/1

This causes the adapter to query the adapter about changes to the
physical SCSI buses and/or fibre channel arbitrated loop and the
driver to make note of any new or removed sequential access devices
or medium changers. The driver will output messages indicating what
devices have been added or removed and the controller, bus, target and
lun used to address the device. Once this is done, the SCSI mid layer
can be informed of changes to the virtual SCSI bus which the driver
presents to it in the usual way. For example:

echo scsi add-single-device 3 2 1 0 > /proc/scsi/scsi

to add a device on controller 3, bus 2, target 1, lun 0. Note that
the driver makes an effort to preserve the devices positions
in the virtual SCSI bus, so if you are only moving tape drives
around on the same adapter and not adding or removing tape drives
from the adapter, informing the SCSI mid layer may not be necessary.

Note that the naming convention of the /proc filesystem entries
contains a number in addition to the driver name. (E.g. "cciss0"
instead of just "cciss" which you might expect.) This is because
of changes to the 2.4 kernel PCI interface related to PCI hot plug
that imply the driver must register with the SCSI mid layer once per
adapter instance rather than once per driver.

Note: ONLY sequential access devices and medium changers are presented
as SCSI devices to the SCSI mid layer by the cciss driver. Specifically,
physical SCSI disk drives are NOT presented to the SCSI mid layer. The
physical SCSI disk drives are controlled directly by the array controller
hardware and it is important to prevent the OS from attempting to directly
access these devices too, as if the array controller were merely a SCSI
controller in the same way that we are allowing it to access SCSI tape drives.

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