* mickey <[EMAIL PROTECTED]> [2007-05-09 15:15]: > On Wed, May 09, 2007 at 06:46:19AM -0400, Nick Holland wrote: > > mickey wrote: > > > On Tue, May 08, 2007 at 07:06:06AM -0400, Nick Holland wrote: > > >> George C wrote: > > ... > > >> > Is it always best to mount /, /tmp, /usr, /var, /home with softdep? > > >> > Under what curcumstances would it not be appropriate? > > >> > > >> If your app makes assumptions about write ordering, softdeps can negate > > >> the care the app author took. For example, some mail programs don't ack > > >> the receipt of a message until it has been safely written to disk, the > > >> idea being that if the power goes out or the machine crashes, if the > > >> message has been acknowledged, IT HAS BEEN RECEIVED and will be there > > >> when the machine comes back up. Softdeps promises that what is on your > > >> disk is coherent, but "coherent" usually means the last few files written > > >> to disk may be just removed when the system comes back up. Not desired > > >> in this case. > > > > > > this is not true. fsync() works as specified. > > > > Apparently, not all apps use fsync, or don't use it properly. > > oh so now you are saying that softdeps are broken because > applications are not calling fsync() ?
Nick never said softdeps were broken. he said that using them with certain applications is not a good idea - that is different. The application is to blame tho. > > At least qmail advises against the use of softdeps: > > http://cr.yp.to/qmail/faq/reliability.html#filesystems > > I also found a reference to another mail program which had people > > making similar advisories, but not sure if they are still applicable. > > you whole above statement is wrong and is not based on facts. > now you are trying to back it up w/ somebody elses opinion > that is also not based on facts. > > now it is also in the archives and peoples will > refer to it as some sort of truth. the damage has been done. the "softdeps are incompatible with qmail" "truth" is as old as softdeps, the damage is long done. -- Henning Brauer, [EMAIL PROTECTED], [EMAIL PROTECTED] BS Web Services, http://bsws.de Full-Service ISP - Secure Hosting, Mail and DNS Services Dedicated Servers, Rootservers, Application Hosting - Hamburg & Amsterdam
