200 lines
5.0 KiB
Groff
200 lines
5.0 KiB
Groff
.\"
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.\" CDDL HEADER START
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.\"
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.\" The contents of this file are subject to the terms of the
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.\" Common Development and Distribution License (the "License").
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.\" You may not use this file except in compliance with the License.
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.\"
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.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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.\" or https://opensource.org/licenses/CDDL-1.0.
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.\" See the License for the specific language governing permissions
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.\" and limitations under the License.
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.\"
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.\" When distributing Covered Code, include this CDDL HEADER in each
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.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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.\" If applicable, add the following below this CDDL HEADER, with the
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.\" fields enclosed by brackets "[]" replaced with your own identifying
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.\" information: Portions Copyright [yyyy] [name of copyright owner]
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.\"
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.\" CDDL HEADER END
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.\"
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.\" Copyright (c) 2020 by Delphix. All rights reserved.
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.\"
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.Dd October 4, 2022
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.Dt ZSTREAM 8
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.Os
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.
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.Sh NAME
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.Nm zstream
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.Nd manipulate ZFS send streams
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.Sh SYNOPSIS
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.Nm
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.Cm dump
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.Op Fl Cvd
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.Op Ar file
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.Nm
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.Cm decompress
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.Op Fl v
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.Op Ar object Ns Sy \&, Ns Ar offset Ns Op Sy \&, Ns Ar type Ns ...
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.Nm
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.Cm redup
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.Op Fl v
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.Ar file
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.Nm
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.Cm token
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.Ar resume_token
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.Nm
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.Cm recompress
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.Op Fl l Ar level
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.Ar algorithm
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.
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.Sh DESCRIPTION
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The
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.Sy zstream
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utility manipulates ZFS send streams output by the
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.Sy zfs send
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command.
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.Bl -tag -width ""
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.It Xo
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.Nm
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.Cm dump
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.Op Fl Cvd
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.Op Ar file
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.Xc
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Print information about the specified send stream, including headers and
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record counts.
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The send stream may either be in the specified
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.Ar file ,
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or provided on standard input.
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.Bl -tag -width "-D"
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.It Fl C
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Suppress the validation of checksums.
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.It Fl v
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Verbose.
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Print metadata for each record.
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.It Fl d
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Dump data contained in each record.
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Implies verbose.
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.El
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.Pp
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The
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.Nm zstreamdump
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alias is provided for compatibility and is equivalent to running
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.Nm
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.Cm dump .
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.It Xo
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.Nm
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.Cm token
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.Ar resume_token
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.Xc
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Dumps zfs resume token information
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.It Xo
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.Nm
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.Cm decompress
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.Op Fl v
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.Op Ar object Ns Sy \&, Ns Ar offset Ns Op Sy \&, Ns Ar type Ns ...
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.Xc
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Decompress selected records in a ZFS send stream provided on standard input,
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when the compression type recorded in ZFS metadata may be incorrect.
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Specify the object number and byte offset of each record that you wish to
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decompress.
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Optionally specify the compression type.
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Valid compression types include
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.Sy off ,
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.Sy gzip ,
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.Sy lz4 ,
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.Sy lzjb ,
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.Sy zstd ,
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and
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.Sy zle .
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The default is
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.Sy lz4 .
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Every record for that object beginning at that offset will be decompressed, if
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possible.
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It may not be possible, because the record may be corrupted in some but not
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all of the stream's snapshots.
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Specifying a compression type of
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.Sy off
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will change the stream's metadata accordingly, without attempting decompression.
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This can be useful if the record is already uncompressed but the metadata
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insists otherwise.
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The repaired stream will be written to standard output.
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.Bl -tag -width "-v"
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.It Fl v
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Verbose.
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Print summary of decompressed records.
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.El
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.It Xo
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.Nm
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.Cm redup
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.Op Fl v
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.Ar file
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.Xc
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Deduplicated send streams can be generated by using the
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.Nm zfs Cm send Fl D
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command.
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The ability to send deduplicated send streams is deprecated.
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In the future, the ability to receive a deduplicated send stream with
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.Nm zfs Cm receive
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will be removed.
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However, deduplicated send streams can still be received by utilizing
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.Nm zstream Cm redup .
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.Pp
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The
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.Nm zstream Cm redup
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command is provided a
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.Ar file
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containing a deduplicated send stream, and outputs an equivalent
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non-deduplicated send stream on standard output.
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Therefore, a deduplicated send stream can be received by running:
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.Dl # Nm zstream Cm redup Pa DEDUP_STREAM_FILE | Nm zfs Cm receive No …
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.Bl -tag -width "-D"
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.It Fl v
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Verbose.
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Print summary of converted records.
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.El
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.It Xo
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.Nm
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.Cm recompress
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.Op Fl l Ar level
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.Ar algorithm
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.Xc
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Recompresses a send stream, provided on standard input, using the provided
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algorithm and optional level, and writes the modified stream to standard output.
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All WRITE records in the send stream will be recompressed, unless they fail
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to result in size reduction compared to being left uncompressed.
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The provided algorithm can be any valid value to the
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.Nm compress
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property.
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Note that encrypted send streams cannot be recompressed.
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.Bl -tag -width "-l"
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.It Fl l Ar level
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Specifies compression level.
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Only needed for algorithms where the level is not implied as part of the name
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of the algorithm (e.g. gzip-3 does not require it, while zstd does, if a
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non-default level is desired).
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.El
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.El
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.
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.Sh EXAMPLES
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Heal a dataset that was corrupted due to OpenZFS bug #12762.
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First, determine which records are corrupt.
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That cannot be done automatically; it requires information beyond ZFS's
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metadata.
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If object
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.Sy 128
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is corrupted at offset
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.Sy 0
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and is compressed using
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.Sy lz4 ,
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then run this command:
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.Bd -literal
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.No # Nm zfs Ar send Fl c Ar … | Nm zstream decompress Ar 128,0,lz4 | \
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Nm zfs recv Ar …
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.Ed
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.Sh SEE ALSO
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.Xr zfs 8 ,
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.Xr zfs-receive 8 ,
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.Xr zfs-send 8 ,
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.Lk https://github.com/openzfs/zfs/issues/12762
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