.\" Copyright (c) 2012 by Delphix. All rights reserved.
.\" Copyright (c) 2012, Joyent, Inc. All rights reserved.
.\" Copyright 2012 Nexenta Systems, Inc. All Rights Reserved.
+.\" Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
.\"
.TH zfs 8 "Jan 10, 2013" "ZFS pool 28, filesystem 5" "System Administration Commands"
.SH NAME
.ad
.sp .6
.RS 4n
-Controls the checksum used to verify data integrity. The default value is \fBon\fR, which automatically selects an appropriate algorithm (currently, \fBfletcher2\fR, but this may change in future releases). The value \fBoff\fR disables integrity checking on user data. Disabling checksums is \fBNOT\fR a recommended practice.
+Controls the checksum used to verify data integrity. The default value is \fBon\fR, which automatically selects an appropriate algorithm (currently, \fBfletcher4\fR, but this may change in future releases). The value \fBoff\fR disables integrity checking on user data. Disabling checksums is \fBNOT\fR a recommended practice.
.sp
Changing this property affects only newly-written data.
.RE
.ne 2
.mk
.na
-\fBcompression\fR=\fBon\fR | \fBoff\fR | \fBlzjb\fR | \fBgzip\fR | \fBgzip-\fR\fIN\fR | \fBzle\fR
+\fBcompression\fR=\fBon\fR | \fBoff\fR | \fBlzjb\fR | \fBgzip\fR | \fBgzip-\fR\fIN\fR | \fBzle\fR | \fBlz4\fR
.ad
.sp .6
.RS 4n
.sp
The \fBzle\fR (zero-length encoding) compression algorithm is a fast and simple algorithm to eliminate runs of zeroes.
.sp
+The \fBlz4\fR compression algorithm is a high-performance replacement
+for the \fBlzjb\fR algorithm. It features significantly faster
+compression and decompression, as well as a moderately higher
+compression ratio than \fBlzjb\fR, but can only be used on pools with
+the \fBlz4_compress\fR feature set to \fIenabled\fR. See
+\fBzpool-features\fR(5) for details on ZFS feature flags and the
+\fBlz4_compress\fR feature.
+.sp
This property can also be referred to by its shortened column name \fBcompress\fR. Changing this property affects only newly-written data.
.RE
.sp
If the \fBsharesmb\fR property is set to \fBoff\fR, the file systems are unshared.
.sp
-In Linux, the share is created with the acl "Everyone:F" by default, meaning that everyone have read access. This however isn't the full truth: Any access control on the underlaying filesystem supersedes this.
+In Linux, the share is created with the ACL (Access Control List) "Everyone:F" ("F" stands for "full permissions", ie. read and write permissions) and no guest access (which means samba must be able to authenticate a real user, system passwd/shadow, ldap or smbpasswd based) by default. This means that any additional access control (dissalow specific user specific access etc) must be done on the underlaying filesystem.
+.sp
+.in +2
+Example to mount a SMB filesystem shared through ZFS (share/tmp):
+.mk
+Note that a user and his/her password \fBmust\fR be given!
+.sp
+.in +2
+smbmount //127.0.0.1/share_tmp /mnt/tmp -o user=workgroup/turbo,password=obrut,uid=1000
+.in -2
+.in -2
.sp
.ne 2
.mk
.in +2
* Samba will need to listen to 'localhost' (127.0.0.1) for the zfs utilities to communitate with samba. This is the default behavior for most Linux distributions.
.sp
-* See the \fBUSERSHARE\fR section of the \fBsmb.conf\fR(5) man page for all configuration options.
+* Samba must be able to authenticate a user. This can be done in a number of ways, depending on if using the system password file, LDAP or the Samba specific smbpasswd file. How to do this is outside the scope of this manual. Please refer to the smb.conf(5) manpage for more information.
+.sp
+* See the \fBUSERSHARE\fR section of the \fBsmb.conf\fR(5) man page for all configuration options in case you need to modify any options to the share afterwards. Do note that any changes done with the 'net' command will be undone if the share is every unshared (such as at a reboot etc). In the future, ZoL will be able to set specific options directly using sharesmb=<option>.
.sp
.in -2
.RE
.ne 2
.mk
.na
+\fB\fBsnapdev\fR=\fBhidden\fR | \fBvisible\fR\fR
+.ad
+.sp .6
+.RS 4n
+Controls whether the snapshots devices of zvol's are hidden or visible. The default value is \fBhidden\fR.
+.RE
+
+.sp
+.ne 2
+.mk
+.na
\fB\fBsnapdir\fR=\fBhidden\fR | \fBvisible\fR\fR
.ad
.sp .6
.ne 2
.mk
.na
-\fB\fBsync\fR=\fBdefault\fR | \fBalways\fR | \fBdisabled\fR\fR
+\fB\fBsync\fR=\fBstandard\fR | \fBalways\fR | \fBdisabled\fR\fR
.ad
.sp .6
.RS 4n
Controls the behavior of synchronous requests (e.g. fsync, O_DSYNC).
-\fBdefault\fR is the POSIX specified behavior of ensuring all synchronous
+\fBstandard\fR is the POSIX specified behavior of ensuring all synchronous
requests are written to stable storage and all devices are flushed to ensure
data is not cached by device controllers (this is the default). \fBalways\fR
causes every file system transaction to be written and flushed before its
.SS "ZFS Volumes as Swap"
.sp
.LP
-Do not swap to a file on a \fBZFS\fR file system. A \fBZFS\fR swap file configuration is not supported.
+\fBZFS\fR volumes may be used as Linux swap devices. After creating the volume
+with the \fBzfs create\fR command set up and enable the swap area using the
+\fBmkswap\fR(8) and \fBswapon\fR(8) commands. Do not swap to a file on a
+\fBZFS\fR file system. A \fBZFS\fR swap file configuration is not supported.
.SH SUBCOMMANDS
.sp
.LP
# \fBzfs destroy -r pool/users@7daysago\fR
# \fBzfs rename -r pool/users@6daysago @7daysago\fR
# \fBzfs rename -r pool/users@5daysago @6daysago\fR
-# \fBzfs rename -r pool/users@yesterday @5daysago\fR
-# \fBzfs rename -r pool/users@yesterday @4daysago\fR
-# \fBzfs rename -r pool/users@yesterday @3daysago\fR
+# \fBzfs rename -r pool/users@4daysago @5daysago\fR
+# \fBzfs rename -r pool/users@3daysago @4daysago\fR
+# \fBzfs rename -r pool/users@2daysago @3daysago\fR
# \fBzfs rename -r pool/users@yesterday @2daysago\fR
# \fBzfs rename -r pool/users@today @yesterday\fR
# \fBzfs snapshot -r pool/users@today\fR
git://git.camperquake.de / zfs.git / blobdiff