blkzone — run zone command on a device


blkzone command [options] device


blkzone is used to run zone command on device that support the Zoned Block Commands (ZBC) or Zoned-device ATA Commands (ZAC). The zones to operate on can be specified using the offset, count and length options.

The device argument is the pathname of the block device.



The command blkzone report is used to report device zone information.

By default, the command will report all zones from the start of the block device. Options may be used to modify this behavior, changing the starting zone or the size of the report, as explained below.

Report output

start Zone start sector
len Zone length in number of sectors
wptr Zone write pointer position
reset Reset write pointer recommended
non-seq Non-sequential write resources active
cond Zone condition
type Zone type

Zone conditions

cl Closed
nw Not write pointer
em Empty
fu Full
oe Explicitly opened
oi Implicitly opened
ol Offline
ro Read only
x? Reserved conditions (should not be reported)


The command blkzone reset is used to reset one or more zones. Unlike sg_reset_wp(8), this command operates from the block layer and can reset a range of zones.

By default, the command will operate from the zone at device  sector 0 and reset all zones. Options may be used to modify this behavior as well as specify the operation to be performed on the zone, as explained below.


The offset and length option arguments may be followed by the multiplicative suffixes KiB (=1024), MiB (=1024*1024), and so on for GiB, TiB, PiB, EiB, ZiB and YiB (the "iB" is optional, e.g., "K" has the same meaning as "KiB") or the suffixes KB (=1000), MB (=1000*1000), and so on for GB, TB, PB, EB, ZB and YB. Additionally, the 0x prefix can be used to specify offset and length in hex.

-o, --offset sector

The starting zone specified as a sector offset. The provided offset in sector units (512 bytes) should match the start of a zone. The default value is zero.

-l, --length sectors

The maximum number of sectors the command should operate on. The default value is the number of sectors remaining after offset. This option cannot be used together with the option --count.

-c, --count count

The maximum number of zones the command should operate on. The default value is the number of zones starting from offset. This option cannot be used together with the option --length.

-v, --verbose

Display the number of zones returned in the report or the range of sectors reset..

-V, --version

Display version information and exit.

-h, --help

Display help text and exit.


Shaun Tancheff <>
Karel Zak <>

See Also



The blkzone command is part of the util-linux package and is available from Linux Kernel Archive.


February 2017 util-linux System Administration