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Diffstat (limited to 'usr/src/man/man5/zpool-features.5')
| -rw-r--r-- | usr/src/man/man5/zpool-features.5 | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/usr/src/man/man5/zpool-features.5 b/usr/src/man/man5/zpool-features.5 index 21a5369799..38045f80df 100644 --- a/usr/src/man/man5/zpool-features.5 +++ b/usr/src/man/man5/zpool-features.5 @@ -808,5 +808,27 @@ The upgrade process runs in the background and may take a while to complete for the filesystems containing a large number of files. .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 + .SH "SEE ALSO" \fBzfs\fR(1M), \fBzpool\fR(1M) |