cciss(4) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | COLOPHON

CCISS(4)                Linux Programmer's Manual               CCISS(4)

NAME         top

       cciss - HP Smart Array block driver

SYNOPSIS         top

       modprobe cciss [ cciss_allow_hpsa=1 ]

DESCRIPTION         top

       Note: 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       4.14, as it is superseded by the hpsa(4) driver in newer kernels.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.

   Options
       cciss_allow_hpsa=1: This option prevents the cciss 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

   Supported hardware
       The 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

   Configuration details
       To configure HP Smart Array controllers, use the HP Array
       Configuration Utility (either hpacuxe(8) or hpacucli(8)) or the
       Offline ROM-based Configuration Utility (ORCA) run from the Smart
       Array's option ROM at boot time.

FILES         top

   Device nodes
       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
       The files /proc/driver/cciss/cciss[0-9]+ 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
       /sys/bus/pci/devices/<dev>/ccissX/cXdY/model
              Displays the SCSI INQUIRY page 0 model for logical drive Y
              of controller X.

       /sys/bus/pci/devices/<dev>/ccissX/cXdY/rev
              Displays the SCSI INQUIRY page 0 revision for logical
              drive Y of controller X.

       /sys/bus/pci/devices/<dev>/ccissX/cXdY/unique_id
              Displays the SCSI INQUIRY page 83 serial number for
              logical drive Y of controller X.

       /sys/bus/pci/devices/<dev>/ccissX/cXdY/vendor
              Displays the SCSI INQUIRY page 0 vendor for logical drive
              Y of controller X.

       /sys/bus/pci/devices/<dev>/ccissX/cXdY/block:cciss!cXdY
              A symbolic link to /sys/block/cciss!cXdY.

       /sys/bus/pci/devices/<dev>/ccissX/rescan
              When this file is written to, the driver rescans the
              controller to discover any new, removed, or modified
              logical drives.

       /sys/bus/pci/devices/<dev>/ccissX/resettable
              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.

       /sys/bus/pci/devices/<dev>/ccissX/cXdY/lunid
              Displays the 8-byte LUN ID used to address logical drive Y
              of controller X.

       /sys/bus/pci/devices/<dev>/ccissX/cXdY/raid_level
              Displays the RAID level of logical drive Y of controller
              X.

       /sys/bus/pci/devices/<dev>/ccissX/cXdY/usage_count
              Displays the usage count (number of opens) of logical
              drive Y of controller X.

   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 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 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 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 caveats.
       The cciss driver 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:

              1. query the adapter about changes to the physical SCSI
                 buses and/or fiber channel arbitrated loop, and

              2. 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).

       Note: Only sequential access devices and medium changers are
       presented as SCSI devices to the SCSI midlayer by the cciss
       driver.  Specifically, physical SCSI disk drives are not
       presented to the SCSI midlayer.  The only disk devices that are
       presented to the kernel are logical drives that the array
       controller constructs from regions on the physical drives.  The
       logical drives are presented to the block layer (not to the SCSI
       midlayer).  It is important for the driver to prevent the kernel
       from accessing the physical drives directly, since these drives
       are used by the array controller to construct the logical drives.

   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 process:

       *  First, the device is told to abort the command.

       *  If that doesn't work, the device is reset.

       *  If that doesn't work, the SCSI bus is reset.

       *  If that doesn't work, the host bus adapter is reset.

       The 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 offline.

       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.

SEE ALSO         top

       hpsa(4), cciss_vol_status(8), hpacucli(8), hpacuxe(8)

       ⟨http://cciss.sf.net⟩, and Documentation/blockdev/cciss.txt and
       Documentation/ABI/testing/sysfs-bus-pci-devices-cciss in the
       Linux kernel source tree

COLOPHON         top

       This page is part of release 5.10 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
       https://www.kernel.org/doc/man-pages/.

Linux                          2017-09-15                       CCISS(4)

Pages that refer to this page: hpsa(4)smartpqi(4)capabilities(7)