Date: Tue, 18 Apr 2000 00:05:14 -0600 From: Chris Fedde <cfedde@fedde.littleton.co.us> To: Salvo Bartolotta <bartequi@neomedia.it> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: re-reading /etc/fstab ... Message-ID: <200004180605.e3I65Eh22956@fedde.littleton.co.us> In-Reply-To: <20000417.23514600@bartequi.ottodomain.org>
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On Mon, 17 Apr 2000 23:51:46 GMT Salvo Bartolotta wrote:
+------------------
| Dear FreeBSDers,
|
| yet another question :-)
|
| If I turn on e.g. the "noatime" option on a ufs filesystem (eg "/" or
| "/usr"), and I want to have my /etc/fstab re-read, I seem to
| understand that I have to reboot.
|
| Alternatively, If I do NOT wish to reboot, I should issue a "shutdown"
| command (with no options whatsoever), unmount the filesystem(s), and
| remount them.
|
| The problems arise with the "/" filesystem. Incidentally, "mount -u /"
| might damage it. In particular, I seem to understand that switching
| from read only to read/write is harmless; whereas switching from
| read/write to read only may actually damage the FS -- especially if
| this happens a few times.
|
| Is there a safe way to turn the option on without rebooting in such
| cases ? Am I (yawn) missing anything trivial ?
|
| Many, many thanks for your help (and patience !)
|
| Best regards,
| Salvo
+------------------
Taking a file system from rw to ro while it is active can cause
some data to be lost. mount -u protects against causing a problem
unless you have the "force" option on. Taking a fs from ro to rw
while it is active is not a problem.
You can mount and unmount non active file systems to your heart's content
and change their options using -u and mount will do its best to prevent a
problem.
I'd do the experimentation on the command line before committing
it in fstab. It is safe to run 'mount -a -u' as long as the changes
in /etc/fstab are benign.
chris
--
Chris Fedde
303 773 9134
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