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| author | rodrigc <rodrigc@FreeBSD.org> | 2013-12-22 10:58:40 +0000 |
|---|---|---|
| committer | rodrigc <rodrigc@FreeBSD.org> | 2013-12-22 10:58:40 +0000 |
| commit | b32afc84b6ea0077167bef23202162f4114126ba (patch) | |
| tree | 1f5eeb72317b77e646e51ee12a63d7c93574882f /release | |
| parent | ddc466d95286aa1e3f68e386d8daabe711afce1d (diff) | |
| download | FreeBSD-src-b32afc84b6ea0077167bef23202162f4114126ba.zip FreeBSD-src-b32afc84b6ea0077167bef23202162f4114126ba.tar.gz | |
Mention ZFS zio nop-write improvement.
Diffstat (limited to 'release')
| -rw-r--r-- | release/doc/en_US.ISO8859-1/relnotes/article.xml | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/release/doc/en_US.ISO8859-1/relnotes/article.xml b/release/doc/en_US.ISO8859-1/relnotes/article.xml index a309e51..05ca69e 100644 --- a/release/doc/en_US.ISO8859-1/relnotes/article.xml +++ b/release/doc/en_US.ISO8859-1/relnotes/article.xml @@ -342,6 +342,14 @@ <para revision="252140">Support for L2ARC compression has been added to ZFS.</para> + <para revision="243524">The zio nop-write improvement from Illumos + was imported into &os;. To reduce I/O, nop-write skips overwriting + data if the checksum (cryptographically secure) of new data + matches the checksum of existing data. It also saves space if + snapshots are in use. This improvement only works only on + datasets with enabled compression, disabled deduplication and + sha256 checksums.</para> + <para>ZFS will now compare the checksums of incoming writes to the checksum of the existing on-disk data and avoid issuing any write I/O for data that has not changed. This will reduce I/O |
