Red Hat Bugzilla – Bug 499029
Documentation out-of-date: URL dead
Last modified: 2010-01-11 21:14:19 EST
(Sorry if this is completely the wrong place to report this. I found no other obvious bug tracker to report this to and several other equally unlikely places to report it.)
The URL to the "Snapshot Performance" in the device-mapper source (including current CVS) is dead, as it points to people.sistina.com.
From here: http://sources.redhat.com/cgi-bin/cvsweb.cgi/device-mapper/INTRO?rev=1.5&content-type=text/x-cvsweb-markup&cvsroot=dm
The 'snapshot' target supports asynchronous snapshots.
I was able to retrieve it from the Wayback Machine:
We merged most of the dm repo into the lvm2 repository and the INTRO file is no longer distributed in current updates.
I've replaced it with the link you found, anyway.