Section (4) cciss
cciss — HP Smart Array block driver
modprobe cciss [ cciss_allow_hpsa=1 ]
This obsolete driver was removed from the kernel in version 4.14, as it is superseded by the hpsa(4) driver in newer kernels.
cciss is a block driver for
older HP Smart Array RAID controllers.
option prevents the
driver from attempting to drive any controllers that the
hpsa(4) driver is capable
of controlling, which is to say, the
cciss driver is restricted by this option
to the following controllers:
Smart Array 5300 Smart Array 5i Smart Array 532 Smart Array 5312 Smart Array 641 Smart Array 642 Smart Array 6400 Smart Array 6400 EM Smart Array 6i Smart Array P600 Smart Array P400i Smart Array E200i Smart Array E200 Smart Array E200i Smart Array E200i Smart Array E200i Smart Array E500
cciss driver supports
the following Smart Array boards:
Smart Array 5300 Smart Array 5i Smart Array 532 Smart Array 5312 Smart Array 641 Smart Array 642 Smart Array 6400 Smart Array 6400 U320 Expansion Module Smart Array 6i Smart Array P600 Smart Array P800 Smart Array E400 Smart Array P400i Smart Array E200 Smart Array E200i Smart Array E500 Smart Array P700m Smart Array P212 Smart Array P410 Smart Array P410i Smart Array P411 Smart Array P812 Smart Array P712m Smart Array P711m
The device naming scheme is as follows:
Major numbers: 104 cciss0 105 cciss1 106 cciss2 105 cciss3 108 cciss4 109 cciss5 110 cciss6 111 cciss7 Minor numbers: b7 b6 b5 b4 b3 b2 b1 b0 |----+----| |----+----| | | | +-------- Partition ID (0=wholedev, 1−15 partition) | +-------------------- Logical Volume number The device naming scheme is: /dev/cciss/c0d0 Controller 0, disk 0, whole device /dev/cciss/c0d0p1 Controller 0, disk 0, partition 1 /dev/cciss/c0d0p2 Controller 0, disk 0, partition 2 /dev/cciss/c0d0p3 Controller 0, disk 0, partition 3 /dev/cciss/c1d1 Controller 1, disk 1, whole device /dev/cciss/c1d1p1 Controller 1, disk 1, partition 1 /dev/cciss/c1d1p2 Controller 1, disk 1, partition 2 /dev/cciss/c1d1p3 Controller 1, disk 1, partition 3
Files in /proc
contain information about the configuration of each
controller. For example:
$ cd /proc/driver/cciss $ ls -l total 0 -rw-r--r-- 1 root root 0 2010−09−10 10:38 cciss0 -rw-r--r-- 1 root root 0 2010−09−10 10:38 cciss1 -rw-r--r-- 1 root root 0 2010−09−10 10:38 cciss2 $ cat cciss2 cciss2: HP Smart Array P800 Controller Board ID: 0x3223103c Firmware Version: 7.14 IRQ: 16 Logical drives: 1 Current Q depth: 0 Current # commands on controller: 0 Max Q depth since init: 1 Max # commands on controller since init: 2 Max SG entries since init: 32 Sequential access devices: 0 cciss/c2d0: 36.38GB RAID 0
Files in /sys
Displays the SCSI INQUIRY page 0 model for logical drive
Displays the SCSI INQUIRY page 0 revision for logical drive
Displays the SCSI INQUIRY page 83 serial number for logical drive
Displays the SCSI INQUIRY page 0 vendor for logical drive
A symbolic link to
When this file is written to, the driver rescans the controller to discover any new, removed, or modified logical drives.
A value of 1 displayed in this file indicates that the reset_devices=1 kernel parameter (used by
kdump) is honored by this controller. A value of 0 indicates that the reset_devices=1 kernel parameter will not be honored. Some models of Smart Array are not able to honor this parameter.
Displays the 8-byte LUN ID used to address logical drive
Displays the RAID level of logical drive
Displays the usage count (number of opens) of logical drive
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/st1, etc.; see st(4) 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
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 run time.
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
distribution). 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
must be informed that changes to the SCSI bus have been
made. This may be done via the
/proc filesystem. For example:
echo rescan > /proc/scsi/cciss0/1
This causes the driver to:
query the adapter about changes to the physical SCSI buses and/or fibre channel arbitrated loop, and
make note of any new or removed sequential access devices or medium changers.
The driver will output messages indicating which devices have been added or removed and the controller, bus, target, and lun used to address each device. The driver then notifies the SCSI midlayer of these changes.
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).
SCSI error handling for tape drives and medium changers
The Linux SCSI midlayer provides an error-handling
protocol that is initiated whenever a SCSI command fails to
complete within a certain amount of time (which can vary
depending on the command). The
cciss driver participates in this
protocol to some extent. The normal protocol is a four-step
First, the device is told to abort the command.
If that doesn_zsingle_quotesz_t work, the device is reset.
If that doesn_zsingle_quotesz_t work, the SCSI bus is reset.
If that doesn_zsingle_quotesz_t work, the host bus adapter is reset.
cciss driver is a
block driver as well as a SCSI driver and only the tape
drives and medium changers are presented to the SCSI
midlayer. Furthermore, unlike more straightforward SCSI
drivers, disk I/O continues through the block side during
the SCSI error-recovery process. Therefore, the
cciss driver implements only
the first two of these actions, aborting the command, and
resetting the device. Note also that most tape drives will
not oblige in aborting commands, and sometimes it appears
they will not even obey a reset command, though in most
circumstances they will. If the command cannot be aborted
and the device cannot be reset, the device will be set
In the event that the error-handling code is triggered and a tape drive is successfully reset or the tardy command is successfully aborted, the tape drive may still not allow I/O to continue until some command is issued that positions the tape to a known position. Typically you must rewind the tape (by issuing mt -f /dev/st0 rewind for example) before I/O can proceed again to a tape drive that was reset.
hpsa(4), cciss_vol_status(8), hpacucli(8), hpacuxe(8)
in the Linux kernel source tree
This page is part of release 4.16 of the Linux
man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
Copyright (C) 2011, Hewlett-Packard Development Company, L.P.
Written by Stephen M. Cameron <scameronbeardog.cce.hp.com>
Licensed under GNU General Public License version 2 (GPLv2)
shorthand for double quote that works everywhere.