BIOCTL(8)

NAME
bioctl - storage management interface

SYNOPSIS
bioctl [-hiqv] [-a alarm-function] [-b channel:target[.lun]] [-H channel:target[.lun]] [-R chunk | channel:target[.lun]] [-t patrol-function] [-u channel:target[.lun]] device

bioctl [-dhiPqsv] [-C flag[,...]] [-c raidlevel] [-k keydisk] [-l chunk[,...]] [-O chunk | channel:target[.lun]] [-p passfile] [-R chunk | channel:target[.lun]] [-r rounds] device

DESCRIPTION
bioctl is used to interact with device drivers that register with bio(4).

The -h, -i, -q, and -v options are used to display information about the specified device:

-h  Where appropriate, produce “human-readable” output. Use unit suffixes: Byte, Kilobyte, Megabyte, Gigabyte, Terabyte, Petabyte, Exabyte in order to reduce the number of digits to four or less.

-i  Display default information for the specified device. For example, for hardware RAID controllers enumerate attached devices. This is the default if no options are specified.

-q  If device is an sd(4), display its vendor, product, revision, and serial number.

-v  Be more verbose in output.

The first synopsis shows options used to manage hardware RAID controllers. device specifies either a drive (e.g. sd1), a hardware RAID controller (e.g. ami0) or a ses(4) or safte(4) enclosure.

The second synopsis shows options used to manage softraid(4) volumes (e.g. sd0) or the softraid controller itself (always softraid0).

The options for hardware RAID controllers are as follows:

-a alarm-function
    Control the RAID card's alarm functionality, if supported. alarm-function may be one of:

    disable
        Disable the alarm on the RAID controller.
    enable
        Enable the alarm on the RAID controller.
    get Retrieve the current alarm state (enabled or disabled).
    silence | quiet
        Silence the alarm if it is currently beeping.

    The alarm-function may be specified as given above, or by the first letter only (e.g. -a e).

-b channel:target[.lun]
    Instruct the device at channel:target[.lun] to start blinking, if there is ses(4) or safte(4) support in the enclosure.

-H channel:target[.lun]
    If the device at channel:target[.lun] is currently marked “Unused”, promote it to being a “Hot Spare”.

-R chunk | channel:target[.lun]
    Manually kick off a rebuild of a degraded RAID volume, using chunk or channel:target[.lun] as a new chunk replacing the offline chunk in the volume. It is not possible to change the number of chunks. The chunk must be specified as a full path to a device file (e.g. /dev/wd0d). A RAID volume rather than a RAID controller is expected as the final argument.

-t patrol-function
    Control the RAID card's patrol functionality, if supported. patrol-function may be one of:

    stop
        Stop the patrol on the RAID controller.
    start
        Start the patrol on the RAID controller.
    get Retrieve the current patrol configuration.
    disable
        Disable the patrol functionality.
    manual
        Enable the patrol functionality to start/stop manually.
    auto[.interval[.start]]
        Enable the patrol functionality to start/stop automatically in every interval seconds, starting the first iteration after start seconds.

-u channel:target[.lun]
    Instruct the device at channel:target[.lun] to cease blinking, if there is ses(4) or safte(4) support in the enclosure.

The options for softraid(4) devices are as follows:

-C flag[,...]
    Pass flag to bioctl. May be one of:

    force
        Force the operation; for example, force the creation of volumes with unclean data in the metadata areas.
    noauto
        Do not automatically assemble this volume at boot time.

-c raidlevel
    Create a new softraid(4) volume of level raidlevel. The device must be “softraid0”; it supports multiple volumes.

    Valid raidlevels are:

    0   RAID 0: A striping discipline.
    1   RAID 1: A mirroring discipline.
    5   RAID 5: A striping discipline with floating parity chunk.
    C   CRYPTO: An encrypting discipline.
    c   CONCAT: A concatenating discipline.
    1C  RAID 1 + CRYPTO: An encrypting and mirroring discipline.

    The CONCAT discipline requires a minimum of one chunk, RAID 0 and RAID 1 disciplines require a minimum of two chunks, RAID 5 requires a minimum of three chunks and the CRYPTO discipline requires exactly one chunk to be provided via -l.

    The RAID 1C discipline requires a minimum of two chunks when a new volume is created, and a minimum of one chunk when an existing volume is assembled. Missing RAID 1C chunks will be marked as offline and must be rebuilt before they become part of the array again.

-d  Detach volume specified by device.

-k keydisk
    Use special device keydisk as a key disk for a crypto volume.

-l chunk[,...]
    Use the chunk device list to create a new volume within the softraid(4) framework. Requires -c.

-O chunk | channel:target[.lun]
    Set the state of chunk or channel:target[.lun] to offline. The state of the RAID volume will change in the same way that it would if the disk physically went offline. The chunk must be specified as a full path to a device file (e.g. /dev/wd0d). A RAID volume rather than a RAID controller is expected as the device argument.

-P  Change the passphrase on the selected crypto volume.

-p passfile
    Passphrase file used when crypto volumes are brought up. This file must be root owned and have 0600 permissions.

-R chunk | channel:target[.lun]
    Manually kick off a rebuild of a degraded volume, using chunk or channel:target[.lun] as a new chunk, replacing the offline chunk in the volume. It is not possible to change the number of chunks. The chunk must be specified as a full path to a device file (e.g. /dev/sd0d) which refers to a partition of fstype RAID. A softraid(4) volume rather than softraid0 is expected as the final argument.

-r rounds
    The number of iterations for the KDF algorithm to use when converting a passphrase into a key, in order to create a new encrypted volume or change the passphrase of an existing encrypted volume. A larger number of iterations takes more time, but offers increased resistance against passphrase guessing attacks. By default, or if rounds is specified as auto, the number of rounds will automatically be based on system performance. The minimum is 16 rounds.

-s  Read passphrases from /dev/stdin rather than /dev/tty, without prompts, confirmation or retry on mismatch.

EXAMPLES
Configure a new softraid(4) volume with four chunks (/dev/sd2e, /dev/sd3e, /dev/sd4e, /dev/sd5e) and a RAID level of 1:

    # bioctl -c 1 -l /dev/sd2e,/dev/sd3e,/dev/sd4e,/dev/sd5e softraid0

Configure a new softraid(4) volume with one chunk (/dev/sd2e) and an encrypting discipline:

    # bioctl -c C -l /dev/sd2e softraid0

bioctl will ask for a passphrase, which will be needed to unlock the encrypted disk. After creating a newly encrypted disk, the first megabyte of it should be zeroed, so tools like fdisk(8) or disklabel(8) don't get confused by the random data that appears on the new disk:

    # dd if=/dev/zero of=/dev/rsd3c bs=1m count=1

Detaching a softraid volume requires the exact volume name. For example:

    # bioctl -d sd2

Start a rebuild of the degraded softraid volume sd0 using a new chunk on wd0d:

    # bioctl -R /dev/wd0d sd0

Show detailed information about the nvme0 controller:

    # bioctl -v nvme0

SEE ALSO
bio(4), scsi(4), softraid(4)

HISTORY
The bioctl command first appeared in OpenBSD 3.8.

AUTHORS
The bioctl interface was written by Marco Peereboom <marco@openbsd.org>.