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List log_spacemap feature in zpool-features.5 manual

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Update zpool-features.5 manpage to describe the log_spacemap feature.

Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Pavel Zakharov <pavel.zakharov@delphix.com>
Signed-off-by: Serapheim Dimitropoulos <serapheim@delphix.com>
Closes #9096
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Serapheim Dimitropoulos 2019-07-31 09:29:01 -07:00 committed by Matthew Ahrens
parent f489458ad7
commit cae97c88c4
1 changed files with 22 additions and 0 deletions
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man/man5/zpool-features.5
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@ -567,6 +567,28 @@ The feature is activated when a clone is created and remains active until all
clones have been destroyed.
.RE
.sp
.ne 2
.na
\fBlog_spacemap\fR
.ad
.RS 4n
.TS
l l .
GUID com.delphix:log_spacemap
READ\-ONLY COMPATIBLE yes
DEPENDENCIES com.delphix:spacemap_v2
.TE
This feature improves performance for heavily-fragmented pools,
especially when workloads are heavy in random-writes. It does so by
logging all the metaslab changes on a single spacemap every TXG
instead of scattering multiple writes to all the metaslab spacemaps.
This feature becomes \fBactive\fR as soon as it is enabled and will never
return to being \fBenabled\fR.
.RE
.sp
.ne 2
.na