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man: doc writecache profile support

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This commit is contained in:
Zdenek Kabelac 2022-01-24 14:50:09 +01:00
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commit b95506815f
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man/lvmcache.7_main
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@ -299,6 +299,39 @@ perform. If not done beforehand, the splitcache command enables the
cleaner mode and waits for flushing to complete before detaching the cleaner mode and waits for flushing to complete before detaching the
writecache. Adding cleaner=0 to the splitcache command will skip the writecache. Adding cleaner=0 to the splitcache command will skip the
cleaner mode, and any required flushing is performed in device suspend. cleaner mode, and any required flushing is performed in device suspend.
.SS dm-writecache using metadata profiles
Writecache allows to set a variety of options. Lots of these settings
can be specified in lvm.conf or profile settings. You can prepare
a number of different profiles in the \fI#DEFAULT_SYS_DIR#/profile\fP directory
and just specify the metadata profile file name when writecaching LV.
.P
.I Example
.nf
# cat <<EOF > #DEFAULT_SYS_DIR#/profile/cache_writecache.profile
allocation {
.RS
cache_settings {
.RS
writecache {
.RS
high_watermark=60
writeback_jobs=1024
.RE
}
.RE
}
.RE
}
EOF
.P
# lvcreate -an -L10G --name wcache vg /dev/fast_ssd
# lvcreate --type writecache -L10G --name main --cachevol wcache \\
--metadataprofile cache_writecache vg /dev/slow_hdd
.fi
. .
.SS dm-cache with separate data and metadata LVs .SS dm-cache with separate data and metadata LVs
. .