DOKK / manpages / debian 11 / zbd-utils / zbd.8.en
ZBD(8) System Manager's Manual ZBD(8)

zbd - manage zoned block devices

zbd command [options] device

zbd is used to manipulate zones of a zoned block device. Zoned block devies are block devices that support the SCSI Zoned Block Commands (ZBC), ATA Zoned-device ATA Commands (ZAC) or NVMe Zoned NameSpace commands (ZNS). The zones to operate on can be specified using the offset and length options.

The device argument must be the pathname of the target zoned block device.

The command zbd report is used to obtain and display the device zone information.

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

Report output

Zone Zone number
type Type of the zone
ofst Zone start offset in Bytes
len Zone length in Bytes
cap Zone usable capacity in Bytes
wp Zone write pointer position in Bytes
cond Zone condition
non_seq Non-sequential write resources active
reset Reset write pointer recommended

Zone types

cnv Conventional
swr Sequential write required
swp Sequential write preferred
??? Unknown (should not be reported)

Zone conditions

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

The command zbd reset is used to reset the write pointer of one or more zones.

The command zbd open is used to explicitly open one or more zones.

The command zbd close is used to close one or more zones.

The command zbd finish is used to finish (transition to full) one or more zones.

By default, all commands will operate from the zone at device offset 0 and operate on all zones. Options may be used to modify this behavior as explained below.

Options applicable to all commands are as follows.

Verbose mode (for debug).
Display device information before executing the command.
Start offset in Bytes of the first zone to operate on.
Length in Bytes of the range of zones to operate on.
Display help text and exit.
Output zone information using the comma-separated (csv) format.
Display the number of zones that are to be reported and exit.
Sepcify reporting option to filter the zone report. filter can be one of the following.
em Empty zones
oi Implicitly opened zones
oe Explicitly opened zones
cl Closed zones
fu Full zones
ro Read only zones
ol Offline zones
nw Conventional zones
ns Non_seq write resource zones
rw Reset write pointer recommended zones 

Damien Le Moal <damien.lemoal@wdc.com>

blkzone(8)

The zbd command is part of the libzbd library available from https://github.com/westerndigitalcorporation/libzbd.