Steven Sim wrote:
Folks;
Today Sun BIG ADMIN website posted an article by Lynne Thompson entitled
"What's New in Patching "
See http://www.sun.com/bigadmin/sundocs/articles/patch-wn.jsp
Could somebody here elaborate more on the following statement....
".........Now, deferred-activation patching uses the loopback file
system (lofs) to ensure the stability of the running system. When a
patch is applied to the running system, the lofs preserves stability
during the patching process. These large kernel patches have always
required a reboot, but now the required reboot activates the changes
made by the lofs."..
It's a bit confusing......especially the part about "lofs preserves
stability during the patching process"....
Hopefully I can get one of those who actually did the work to post a
blog entry about it. Anyway, the executables and libraries which need
to remain stable during the entire duration of the patching application
and would be affected by the patch operation are copied into a temporary
location, lofs is used to mount them up into the original location, and
then we can patch the originals without adversely affecting the binaries
in use. You must reboot at the end of such a patch application to get
the system back into a consistent state.
Live Upgrade for patching is still recommended, since it's at least as
safe and doesn't require quiescing the system to apply such patches, but
this provides an alternative when that is not an option.
Dave
_______________________________________________
opensolaris-discuss mailing list
opensolaris-discuss@opensolaris.org
