Nicolas Williams writes: > On Tue, Jun 03, 2008 at 12:12:49PM -0700, Jordan Brown wrote: > > One could imagine having a system call that did the final sync and set > > the file systems read-only, or something like that, so that we could > > have additional user-space involvement between the sync and the actual > > final shutdown, but we don't have that. > > Is there no way to do that now? (sync and remount -o ro, that is)
I don't think so. > Jim, > > Asking that UPS vendors provide a way to delay poweroff seems > unrealistic (unless they already provide it). As unrealistic as putting > these hooks in the kernel seems to you. No, I don't use a UPS at home > (other than my laptop battery :) It seems somewhat reasonable to me, given the alternatives. All of the UPSes I've used have a "shutdown delay" variable, and the software should support this. You're right that we could be safer here if we were able to go from a read/write mount of / down to a read-only mount (as do many other OSes), but we've never done that. -- James Carlson, Solaris Networking <james.d.carlson at sun.com> Sun Microsystems / 35 Network Drive 71.232W Vox +1 781 442 2084 MS UBUR02-212 / Burlington MA 01803-2757 42.496N Fax +1 781 442 1677
