mikel@codas.ATT.UUCP (Mikel Manitius) (02/08/86)
I have been mounting filesystems atop mounted filesystems (ie: /usr/spool
being it's own filesystem mounted atop /usr which is also it's own fs) for
as long as I can remember, and I've seen many other people do it too. I
have never had any problems with this, so long as the filesystem it is
mounted on, gets mounted first.
We use this in the project I'm working on, and someone (who's credibility
I question) is telling me that this is improper, and causes the system to
behave irrationally, and that they cannot use it.
I would like to hear from anyone who is using nested mount points, and
either has or hasn't had any trouble with it, I would certainly appreciate
it if you could send me mail.
Thanks
--
Mikel Manitius @ AT&T-IS Altamonte Springs, FL
...{ihnp4|akgua|bellcore|clyde|koura}!codas!mikeljsdy@hadron.UUCP (Joseph S. D. Yao) (02/18/86)
In article <466@codas.ATT.UUCP> mikel@codas.ATT.UUCP (Mikel Manitius) writes: >I have been mounting filesystems atop mounted filesystems ... >We use this in the project I'm working on, and someone (who's credibility >I question) is telling me that this is improper, and causes the system to >behave irrationally, and that they cannot use it. I don't know which version of Sys V you are using. Some cannot support really long mount-point names. That aside, you must be sure that the shutdown shell command repeats its unmount-all shell command pipe line for as many iterations as you have depth of mounting. The original has 2, which is fine for /usr/spool, /usr/src, and /usr/tmp; but breaks down on (e.g.) /usr/src/add-ons. -- Joe Yao hadron!jsdy@seismo.{CSS.GOV,ARPA,UUCP}
mn@ll1.UUCP (Mark Nettleingham) (02/19/86)
> >We use this in the project I'm working on, and someone (who's credibility > >I question) is telling me that this is improper, and causes the system to > >behave irrationally, and that they cannot use it. > We have been using nested file systems for many years on this system and so far haven't had a single problem because of it. The problem of unmounting in sequence during shutdown can be solved by using df instead of mount. Df reports the file systems in reverse order. So the line: df | sed -n -e '/\/tmp /d' -e '/\/ /d' -e 's/^.*(\(.*\)).*/umount \1/p' | sh - will correctly unmount all file systems in a single pass. Note: the above line of code was given to me by Jack Allen of Bell South. Mark Nettleingham ll1!mn