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| author | Serapheim Dimitropoulos <[email protected]> | 2019-07-31 09:29:01 -0700 |
|---|---|---|
| committer | Matthew Ahrens <[email protected]> | 2019-07-31 09:29:01 -0700 |
| commit | cae97c88c4ed2d99b523b84c713993d26034a23b (patch) | |
| tree | c9932b61c6a0d3a0d3b4fa9473970c0972c8fa61 /man/man5 | |
| parent | f489458ad7e7214df455ac00af621e9b4369361d (diff) | |
List log_spacemap feature in zpool-features.5 manual
Update zpool-features.5 manpage to describe the log_spacemap feature.
Reviewed-by: Matthew Ahrens <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Pavel Zakharov <[email protected]>
Signed-off-by: Serapheim Dimitropoulos <[email protected]>
Closes #9096
Diffstat (limited to 'man/man5')
| -rw-r--r-- | man/man5/zpool-features.5 | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/man/man5/zpool-features.5 b/man/man5/zpool-features.5 index 00bad9f74..6c03f9049 100644 --- a/man/man5/zpool-features.5 +++ b/man/man5/zpool-features.5 @@ -570,6 +570,28 @@ clones have been destroyed. .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 \fBlz4_compress\fR .ad .RS 4n |