Manual:$wgUseLocalMessageCache

Message Cache: $wgUseLocalMessageCache
Make a local copy of the message cache, in addition to memcached.
Introduced in version:1.16.0 (r52503)
Removed in version:still in use
Allowed values:(boolean)
Default value:false

Details edit

Set this to true to make a local copy of the message cache, for use in addition to $wgMessageCacheType . The files will be put in $wgCacheDirectory .