> 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
How can the originals be accessed while another file system mounting on its dir? In my understanding, the originals will be covered by the new mounted file system until it is umounted. > in use. You must reboot at the end of such a patch application to get > the system back into a consistent state. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dave Miner Sent: 2007年6月26日 2:26 To: Steven Sim Cc: opensolaris-discuss@opensolaris.org Subject: Re: [osol-discuss] Deferred Patching Scheme 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 _______________________________________________ opensolaris-discuss mailing list opensolaris-discuss@opensolaris.org
