| zpool-features.7 (239749) | zpool-features.7 (239774) |
|---|---|
| 1'\" te 2.\" Copyright (c) 2012, Martin Matuska <mm@FreeBSD.org>. 3.\" All Rights Reserved. 4.\" 5.\" The contents of this file are subject to the terms of the 6.\" Common Development and Distribution License (the "License"). 7.\" You may not use this file except in compliance with the License. 8.\" --- 5 unchanged lines hidden (view full) --- 14.\" When distributing Covered Code, include this CDDL HEADER in each 15.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16.\" If applicable, add the following below this CDDL HEADER, with the 17.\" fields enclosed by brackets "[]" replaced with your own identifying 18.\" information: Portions Copyright [yyyy] [name of copyright owner] 19.\" 20.\" Copyright (c) 2012 by Delphix. All rights reserved. 21.\" | 1'\" te 2.\" Copyright (c) 2012, Martin Matuska <mm@FreeBSD.org>. 3.\" All Rights Reserved. 4.\" 5.\" The contents of this file are subject to the terms of the 6.\" Common Development and Distribution License (the "License"). 7.\" You may not use this file except in compliance with the License. 8.\" --- 5 unchanged lines hidden (view full) --- 14.\" When distributing Covered Code, include this CDDL HEADER in each 15.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16.\" If applicable, add the following below this CDDL HEADER, with the 17.\" fields enclosed by brackets "[]" replaced with your own identifying 18.\" information: Portions Copyright [yyyy] [name of copyright owner] 19.\" 20.\" Copyright (c) 2012 by Delphix. All rights reserved. 21.\" |
| 22.\" $FreeBSD: head/cddl/contrib/opensolaris/cmd/zpool/zpool-features.5 239749 2012-08-27 19:52:55Z mm $ | 22.\" $FreeBSD: head/cddl/contrib/opensolaris/cmd/zpool/zpool-features.5 239774 2012-08-28 12:25:37Z mm $ |
| 23.\" | 23.\" |
| 24.Dd Aug 27, 2012 | 24.Dd Aug 28, 2012 |
| 25.Dt ZPOOL-FEATURES 8 26.Os 27.Sh NAME 28.Nm zpool-features 29.Nd ZFS pool feature descriptions 30.Sh DESCRIPTION 31ZFS pool on\-disk format versions are specified via "features" which replace 32the old on\-disk format numbers (the last supported on\-disk format number is --- 124 unchanged lines hidden (view full) --- 157.Sy freeing 158property. 159.Pp 160This feature is only 161.Sy active 162while 163.Sy freeing 164is non\-zero. | 25.Dt ZPOOL-FEATURES 8 26.Os 27.Sh NAME 28.Nm zpool-features 29.Nd ZFS pool feature descriptions 30.Sh DESCRIPTION 31ZFS pool on\-disk format versions are specified via "features" which replace 32the old on\-disk format numbers (the last supported on\-disk format number is --- 124 unchanged lines hidden (view full) --- 157.Sy freeing 158property. 159.Pp 160This feature is only 161.Sy active 162while 163.Sy freeing 164is non\-zero. |
| 165.It Sy empty_bpobj 166.Bl -column "READ\-ONLY COMPATIBLE" "com.delphix:empty_bpobj" 167.It GUID Ta com.delphix:empty_bpobj 168.It READ\-ONLY COMPATIBLE Ta yes 169.It DEPENDENCIES Ta none 170.El 171.Pp 172This feature increases the performance of creating and using a large number 173of snapshots of a single filesystem or volume, and also reduces the disk 174space required. 175.Pp 176When there are many snapshots, each snapshot uses many Block Pointer Objects 177.Pq bpobj's 178to track blocks associated with that snapshot. 179However, in common use cases, most of these bpobj's are empty. 180This feature allows us to create each bpobj on-demand, thus eliminating the 181empty bpobjs. 182.Pp 183This feature is 184.Sy active 185while there are any filesystems, volumes, or snapshots which were created 186after enabling this feature. 187.El |
|
| 165.Sh SEE ALSO 166.Xr zpool 8 167.Sh AUTHORS 168This manual page is a 169.Xr mdoc 7 170reimplementation of the 171.Tn illumos 172manual page 173.Em zpool-features(5) , 174modified and customized for 175.Fx 176and licensed under the Common Development and Distribution License 177.Pq Tn CDDL . 178.Pp 179The 180.Xr mdoc 7 181implementation of this manual page was initially written by 182.An Martin Matuska Aq mm@FreeBSD.org . | 188.Sh SEE ALSO 189.Xr zpool 8 190.Sh AUTHORS 191This manual page is a 192.Xr mdoc 7 193reimplementation of the 194.Tn illumos 195manual page 196.Em zpool-features(5) , 197modified and customized for 198.Fx 199and licensed under the Common Development and Distribution License 200.Pq Tn CDDL . 201.Pp 202The 203.Xr mdoc 7 204implementation of this manual page was initially written by 205.An Martin Matuska Aq mm@FreeBSD.org . |