diff options
Diffstat (limited to 'usr/src/man')
| -rw-r--r-- | usr/src/man/man1m/zdb.1m | 3 | ||||
| -rw-r--r-- | usr/src/man/man5/zpool-features.5 | 22 |
2 files changed, 24 insertions, 1 deletions
diff --git a/usr/src/man/man1m/zdb.1m b/usr/src/man/man1m/zdb.1m index ca771c24d7..422fba96d9 100644 --- a/usr/src/man/man1m/zdb.1m +++ b/usr/src/man/man1m/zdb.1m @@ -192,7 +192,8 @@ By default, .Nm verifies that all non-free blocks are referenced, which can be very expensive. .It Fl m -Display the offset, spacemap, and free space of each metaslab. +Display the offset, spacemap, free space of each metaslab, all the log +spacemaps and their obsolete entry statistics. .It Fl mm Also display information about the on-disk free space histogram associated with each metaslab. 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) |