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OpenZFS 9286 - want refreservation=auto

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Authored by: Mike Gerdts <mike.gerdts@joyent.com>
Reviewed by: Allan Jude <allanjude@freebsd.org>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: John Kennedy <john.kennedy@delphix.com>
Reviewed by: Andy Stormont <astormont@racktopsystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Approved by: Richard Lowe <richlowe@richlowe.net>
Ported-by: Don Brady <don.brady@delphix.com>

Porting Notes:
* Adopted destroy_dataset in ZTS test cleanup
* Use ksh shebang instead of bash for new tests

OpenZFS-issue: https://www.illumos.org/issues/9286
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/723d0c85
Closes #7387
This commit is contained in:
Mike Gerdts
2018-04-11 10:14:45 -06:00
committed by Brian Behlendorf
parent 9966754ac5
commit d22f3a8244
9 changed files with 424 additions and 11 deletions
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man/man8/zfs.8
+39 -5
View File
@@ -28,6 +28,7 @@
.\" Copyright (c) 2014 Integros [integros.com]
.\" Copyright 2016 Richard Laager. All rights reserved.
.\" Copyright 2017 Nexenta Systems, Inc.
.\" Copyright 2018 Joyent, Inc.
.\"
.Dd January 10, 2018
.Dt ZFS 8 SMM
@@ -1790,7 +1791,7 @@ Limits the amount of space a dataset can consume.
This property enforces a hard limit on the amount of space used.
This hard limit does not include space used by descendents, including file
systems and snapshots.
.It Sy refreservation Ns = Ns Em size Ns | Ns Sy none
.It Sy refreservation Ns = Ns Em size Ns | Ns Sy none Ns | Ns Sy auto
The minimum amount of space guaranteed to a dataset, not including its
descendents.
When the amount of space used is below this value, the dataset is treated as if
@@ -1808,6 +1809,22 @@ this reservation to accommodate the current number of
.Qq referenced
bytes in the dataset.
.Pp
If
.Sy refreservation
is set to
.Sy auto ,
a volume is thick provisioned
.Po or
.Qq not sparse
.Pc .
.Sy refreservation Ns = Ns Sy auto
is only supported on volumes.
See
.Sy volsize
in the
.Sx Native Properties
section for more information about sparse volumes.
.Pp
This property can also be referred to by its shortened column name,
.Sy refreserv .
.It Sy relatime Ns = Ns Sy on Ns | Ns Sy off
@@ -2022,22 +2039,39 @@ Extreme care should be used when adjusting the volume size.
Though not recommended, a
.Qq sparse volume
.Po also known as
.Qq thin provisioning
.Qq thin provisioned
.Pc
can be created by specifying the
.Fl s
option to the
.Nm zfs Cm create Fl V
command, or by changing the reservation after the volume has been created.
command, or by changing the value of the
.Sy refreservation
property
.Po or
.Sy reservation
property on pool version 8 or earlier
.Pc
after the volume has been created.
A
.Qq sparse volume
is a volume where the reservation is less then the volume size.
is a volume where the value of
.Sy refreservation
is less than the size of the volume plus the space required to store its
metadata.
Consequently, writes to a sparse volume can fail with
.Er ENOSPC
when the pool is low on space.
For a sparse volume, changes to
.Sy volsize
are not reflected in the reservation.
are not reflected in the
.Sy refreservation.
A volume that is not sparse is said to be
.Qq thick provisioned .
A sparse volume can become thick provisioned by setting
.Sy refreservation
to
.Sy auto .
.It Sy volmode Ns = Ns Cm default | full | geom | dev | none
This property specifies how volumes should be exposed to the OS.
Setting it to