193 lines
6.2 KiB
Groff
193 lines
6.2 KiB
Groff
.\"
|
|
.\" CDDL HEADER START
|
|
.\"
|
|
.\" The contents of this file are subject to the terms of the
|
|
.\" Common Development and Distribution License (the "License").
|
|
.\" You may not use this file except in compliance with the License.
|
|
.\"
|
|
.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
|
|
.\" or https://opensource.org/licenses/CDDL-1.0.
|
|
.\" See the License for the specific language governing permissions
|
|
.\" and limitations under the License.
|
|
.\"
|
|
.\" When distributing Covered Code, include this CDDL HEADER in each
|
|
.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
|
|
.\" If applicable, add the following below this CDDL HEADER, with the
|
|
.\" fields enclosed by brackets "[]" replaced with your own identifying
|
|
.\" information: Portions Copyright [yyyy] [name of copyright owner]
|
|
.\"
|
|
.\" CDDL HEADER END
|
|
.\"
|
|
.\" Copyright (c) 2021 Klara, Inc.
|
|
.\"
|
|
.Dd October 30, 2022
|
|
.Dt VDEVPROPS 7
|
|
.Os
|
|
.
|
|
.Sh NAME
|
|
.Nm vdevprops
|
|
.Nd native and user-defined properties of ZFS vdevs
|
|
.
|
|
.Sh DESCRIPTION
|
|
Properties are divided into two types, native properties and user-defined
|
|
.Pq or Qq user
|
|
properties.
|
|
Native properties either export internal statistics or control ZFS behavior.
|
|
In addition, native properties are either editable or read-only.
|
|
User properties have no effect on ZFS behavior, but you can use them to annotate
|
|
vdevs in a way that is meaningful in your environment.
|
|
For more information about user properties, see the
|
|
.Sx User Properties
|
|
section, below.
|
|
.
|
|
.Ss Native Properties
|
|
Every vdev has a set of properties that export statistics about the vdev
|
|
as well as control various behaviors.
|
|
Properties are not inherited from top-level vdevs, with the exception of
|
|
checksum_n, checksum_t, io_n, io_t, slow_io_n, and slow_io_t.
|
|
.Pp
|
|
The values of numeric properties can be specified using human-readable suffixes
|
|
.Po for example,
|
|
.Sy k , KB , M , Gb ,
|
|
and so forth, up to
|
|
.Sy Z
|
|
for zettabyte
|
|
.Pc .
|
|
The following are all valid
|
|
.Pq and equal
|
|
specifications:
|
|
.Li 1536M , 1.5g , 1.50GB .
|
|
.Pp
|
|
The values of non-numeric properties are case sensitive and must be lowercase.
|
|
.Pp
|
|
The following native properties consist of read-only statistics about the
|
|
vdev.
|
|
These properties can not be changed.
|
|
.Bl -tag -width "fragmentation"
|
|
.It Sy capacity
|
|
Percentage of vdev space used
|
|
.It Sy state
|
|
state of this vdev such as online, faulted, or offline
|
|
.It Sy guid
|
|
globally unique id of this vdev
|
|
.It Sy asize
|
|
The allocable size of this vdev
|
|
.It Sy psize
|
|
The physical size of this vdev
|
|
.It Sy ashift
|
|
The physical sector size of this vdev expressed as the power of two
|
|
.It Sy size
|
|
The total size of this vdev
|
|
.It Sy free
|
|
The amount of remaining free space on this vdev
|
|
.It Sy allocated
|
|
The amount of allocated space on this vdev
|
|
.It Sy expandsize
|
|
How much this vdev can expand by
|
|
.It Sy fragmentation
|
|
Percent of fragmentation in this vdev
|
|
.It Sy parity
|
|
The level of parity for this vdev
|
|
.It Sy devid
|
|
The device id for this vdev
|
|
.It Sy physpath
|
|
The physical path to the device
|
|
.It Sy encpath
|
|
The enclosure path to the device
|
|
.It Sy fru
|
|
Field Replacable Unit, usually a model number
|
|
.It Sy parent
|
|
Parent of this vdev
|
|
.It Sy children
|
|
Comma separated list of children of this vdev
|
|
.It Sy numchildren
|
|
The number of children belonging to this vdev
|
|
.It Sy read_errors , write_errors , checksum_errors , initialize_errors
|
|
The number of errors of each type encountered by this vdev
|
|
.It Sy null_ops , read_ops , write_ops , free_ops , claim_ops , trim_ops
|
|
The number of I/O operations of each type performed by this vdev
|
|
.It Xo
|
|
.Sy null_bytes , read_bytes , write_bytes , free_bytes , claim_bytes ,
|
|
.Sy trim_bytes
|
|
.Xc
|
|
The cumulative size of all operations of each type performed by this vdev
|
|
.It Sy removing
|
|
If this device is currently being removed from the pool
|
|
.El
|
|
.Pp
|
|
The following native properties can be used to change the behavior of a vdev.
|
|
.Bl -tag -width "allocating"
|
|
.It Sy checksum_n , checksum_t , io_n , io_t , slow_io_n , slow_io_t
|
|
Tune the fault management daemon by specifying checksum/io thresholds of <N>
|
|
errors in <T> seconds, respectively.
|
|
These properties can be set on leaf and top-level vdevs.
|
|
When the property is set on the leaf and top-level vdev, the value of the leaf
|
|
vdev will be used.
|
|
If the property is only set on the top-level vdev, this value will be used.
|
|
The value of these properties do not persist across vdev replacement.
|
|
For this reason, it is advisable to set the property on the top-level vdev -
|
|
not on the leaf vdev itself.
|
|
The default values for
|
|
.Sy OpenZFS on Linux
|
|
are 10 errors in 600 seconds.
|
|
For
|
|
.Sy OpenZFS on FreeBSD
|
|
defaults see
|
|
.Xr zfsd 8 .
|
|
.It Sy comment
|
|
A text comment up to 8192 characters long
|
|
.It Sy bootsize
|
|
The amount of space to reserve for the EFI system partition
|
|
.It Sy failfast
|
|
If this device should propage BIO errors back to ZFS, used to disable
|
|
failfast.
|
|
.It Sy path
|
|
The path to the device for this vdev
|
|
.It Sy allocating
|
|
If this device should perform new allocations, used to disable a device
|
|
when it is scheduled for later removal.
|
|
See
|
|
.Xr zpool-remove 8 .
|
|
.El
|
|
.Ss User Properties
|
|
In addition to the standard native properties, ZFS supports arbitrary user
|
|
properties.
|
|
User properties have no effect on ZFS behavior, but applications or
|
|
administrators can use them to annotate vdevs.
|
|
.Pp
|
|
User property names must contain a colon
|
|
.Pq Qq Sy \&:
|
|
character to distinguish them from native properties.
|
|
They may contain lowercase letters, numbers, and the following punctuation
|
|
characters: colon
|
|
.Pq Qq Sy \&: ,
|
|
dash
|
|
.Pq Qq Sy - ,
|
|
period
|
|
.Pq Qq Sy \&. ,
|
|
and underscore
|
|
.Pq Qq Sy _ .
|
|
The expected convention is that the property name is divided into two portions
|
|
such as
|
|
.Ar module : Ns Ar property ,
|
|
but this namespace is not enforced by ZFS.
|
|
User property names can be at most 256 characters, and cannot begin with a dash
|
|
.Pq Qq Sy - .
|
|
.Pp
|
|
When making programmatic use of user properties, it is strongly suggested to use
|
|
a reversed DNS domain name for the
|
|
.Ar module
|
|
component of property names to reduce the chance that two
|
|
independently-developed packages use the same property name for different
|
|
purposes.
|
|
.Pp
|
|
The values of user properties are arbitrary strings and
|
|
are never validated.
|
|
Use the
|
|
.Nm zpool Cm set
|
|
command with a blank value to clear a user property.
|
|
Property values are limited to 8192 bytes.
|
|
.Sh SEE ALSO
|
|
.Xr zpoolprops 7 ,
|
|
.Xr zpool-set 8
|