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Illumos 4757, 4913
4757 ZFS embedded-data block pointers ("zero block compression")
4913 zfs release should not be subject to space checks
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Max Grossman <max.grossman@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: Dan McDonald <danmcd@omniti.com>
Approved by: Dan McDonald <danmcd@omniti.com>
References:
https://www.illumos.org/issues/4757
https://www.illumos.org/issues/4913
https://github.com/illumos/illumos-gate/commit/5d7b4d4
Porting notes:
For compatibility with the fastpath code the zio_done() function
needed to be updated. Because embedded-data block pointers do
not require DVAs to be allocated the associated vdevs will not
be marked and therefore should not be unmarked.
Ported by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2544
This commit is contained in:
Matthew Ahrens
committed by
Brian Behlendorf
Brian Behlendorf
parent
faf0f58c69
commit
9b67f60560
@@ -358,6 +358,33 @@ never return to being \fBenabled\fB.
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.RE
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.sp
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.ne 2
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.na
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\fB\fBembedded_data\fR\fR
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.ad
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.RS 4n
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.TS
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l l .
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GUID com.delphix:embedded_data
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READ\-ONLY COMPATIBLE no
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DEPENDENCIES none
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.TE
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This feature improves the performance and compression ratio of
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highly-compressible blocks. Blocks whose contents can compress to 112 bytes
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or smaller can take advantage of this feature.
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When this feature is enabled, the contents of highly-compressible blocks are
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stored in the block "pointer" itself (a misnomer in this case, as it contains
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the compresseed data, rather than a pointer to its location on disk). Thus
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the space of the block (one sector, typically 512 bytes or 4KB) is saved,
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and no additional i/o is needed to read and write the data block.
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This feature becomes \fBactive\fR as soon as it is enabled and will
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never return to being \fBenabled\fR.
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.RE
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.SH "SEE ALSO"
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\fBzpool\fR(8)
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+37
-4
@@ -174,12 +174,12 @@ zfs \- configures ZFS file systems
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.LP
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.nf
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\fBzfs\fR \fBsend\fR [\fB-DnPpRv\fR] [\fB-\fR[\fBiI\fR] \fIsnapshot\fR] \fIsnapshot\fR
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\fBzfs\fR \fBsend\fR [\fB-DnPpRve\fR] [\fB-\fR[\fBiI\fR] \fIsnapshot\fR] \fIsnapshot\fR
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.fi
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.LP
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.nf
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\fBzfs\fR \fBsend\fR [\fB-i \fIsnapshot\fR|\fIbookmark\fR]\fR \fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR
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\fBzfs\fR \fBsend\fR [\fB-e\fR] [\fB-i \fIsnapshot\fR|\fIbookmark\fR]\fR \fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR
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.fi
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.LP
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@@ -2600,7 +2600,7 @@ See \fBzpool-features\fR(5) for details on ZFS feature flags and the
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.sp
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.ne 2
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.na
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\fBzfs send\fR [\fB-DnPpRv\fR] [\fB-\fR[\fBiI\fR] \fIsnapshot\fR] \fIsnapshot\fR
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\fBzfs send\fR [\fB-DnPpRve\fR] [\fB-\fR[\fBiI\fR] \fIsnapshot\fR] \fIsnapshot\fR
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.ad
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.sp .6
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.RS 4n
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@@ -2657,6 +2657,23 @@ Generate a deduplicated stream. Blocks which would have been sent multiple times
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.ne 2
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.mk
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.na
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\fB\fB-e\fR\fR
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.ad
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.sp .6
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.RS 4n
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Generate a more compact stream by using WRITE_EMBEDDED records for blocks
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which are stored more compactly on disk by the \fBembedded_data\fR pool
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feature. This flag has no effect if the \fBembedded_data\fR feature is
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disabled. The receiving system must have the \fBembedded_data\fR feature
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enabled. If the \fBlz4_compress\fR feature is active on the sending system,
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then the receiving system must have that feature enabled as well. See
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\fBzpool-features\fR(5) for details on ZFS feature flags and the
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\fBembedded_data\fR feature.
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.RE
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.sp
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.ne 2
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.na
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\fB\fB-p\fR\fR
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.ad
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.sp .6
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@@ -2705,7 +2722,7 @@ The format of the stream is committed. You will be able to receive your streams
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.sp
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.ne 2
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.na
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\fBzfs send\fR [\fB-i\fR \fIsnapshot\fR|\fIbookmark\fR] \fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR
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\fBzfs send\fR [\fB-e\fR] [\fB-i\fR \fIsnapshot\fR|\fIbookmark\fR] \fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR
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.ad
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.sp .6
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.RS 4n
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@@ -2822,6 +2839,22 @@ Do not actually receive the stream. This can be useful in conjunction with the \
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Force a rollback of the file system to the most recent snapshot before performing the receive operation. If receiving an incremental replication stream (for example, one generated by \fBzfs send -R -[iI]\fR), destroy snapshots and file systems that do not exist on the sending side.
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.RE
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.sp
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.ne 2
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.na
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\fB\fB-e\fR\fR
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.ad
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.sp .6
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.RS 4n
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Generate a more compact stream by using WRITE_EMBEDDED records for blocks
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which are stored more compactly on disk by the \fBembedded_data\fR pool
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feature. This flag has no effect if the \fBembedded_data\fR feature is
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disabled. The receiving system must have the \fBembedded_data\fR feature
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enabled. If the \fBlz4_compress\fR feature is active on the sending system,
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then the receiving system must have that feature enabled as well. See
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\fBzpool-features\fR(5) for details on ZFS feature flags and the
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\fBembedded_data\fR feature.
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.RE
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.RE
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.sp
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