[1608] in RedHat Linux List
Re: redhat-digest Digest V96 #414
daemon@ATHENA.MIT.EDU (Randy Schrickel)
Tue Oct 29 09:41:05 1996
Date: Tue, 29 Oct 1996 09:29:07 -0500
From: Randy Schrickel <randy.schrickel@raba.com>
To: redhat-list@redhat.com
CC: junkie@glcom.com
Resent-From: redhat-list@redhat.com
Reply-To: redhat-list@redhat.com
> Subject: Re: Weird mount problem!
> Date: Tue, 29 Oct 1996 07:57:46 -0500 (EST)
> From: Info junkie <junkie@glcom.com>
> To: redhat-list@redhat.com
>
> > > /dev/hda3 none ext2 defaults 0 0
> > > I have never had to use /dev/hda3 so it was normally just sitting there.
> > >
> > > Now i need to use it, so i thought pas problem; i'll just mount it
> > >
> > > ----
> > > [root@glink /root]# mount /dev/hda3 -t ext2 /home
> > > [root@glink /root]# cd /home
> > > [root@glink /home]# ls
> > > lost+found
> > > [root@glink /home]#
> > > -----
> > >
> > > And now /home/* files are gone! What is going on?
> > >
> >
> > Actually, they're not gone. They're just...sorta...underneath.
> >You need to create another directory, "/home1", maybe. That will be
> > what's called a "mount point". See your /etc/fstab for examples of
> >"mount points." Then you can mount "/dev/hda3 on /home1.
> >
> > By way of explanation: there exists on Suns a _transparent_ filesystem.
Huh? Never heard it called that before. It's actually a "feature" of the
mount command (some might call it a bug; I think this topic has been
discussed here before). IMHO, a feature that should be used with caution
due to the confusion it can cause.
> >Picture this: you mount your CDROM on the mount point "/mnt/cdrom".
> > You then mount /dev/hda3 as a transparent filesystem on top of
> > "/mnt/cdrom". A transparent filesystem differs from a regular
> >filesystem in that the underlying filesystem "shines through", much
I'd call that a "opaque" filesystem, because you *can't* see what's
underneath. The later mount hides what is on the first mount. This is
exactly Jamal's problem.
> [root@glink /]# df
> Filesystem 1024-blocks Used Available Capacity Mounted on
> /dev/hda2 991000 851669 88125 91% /
> /dev/hdc1 991000 501679 438117 53% /a
> /dev/hda1 354592 226224 128368 64% /dosc
>
> [root@glink /]# ls -l
> . .drwxr-xr-x 22 root root 1024 Oct 29 07:48 home
> drwxr-xr-x 2 root root 1024 Oct 29 07:38 home1
> . .
> note home1 created via symbolic link to home.
Don't want home1 to be a link to home, make it a real directory.
"rm /home1; mkdir /home1"
> mount /dev/hda3 -t ext2 /home1
> [root@glink /]# mount -t ext2 /dev/hda3 /home1
> [root@glink /]# df
> Filesystem 1024-blocks Used Available Capacity Mounted on
> /dev/hda2 991000 851669 88125 91% /
> /dev/hdc1 991000 501679 438117 53% /a
> /dev/hda1 354592 226224 128368 64% /dosc
> /dev/hda3 634239 13 601466 0% /home1
> [root@glink /]# find /home1
> /home1
> /home1/lost+found
This is exactly what you would expect, and is actually what you want.
Now you just need to copy everything from /home to /home1 (using tar,
cp, or whatever... I think this was discussed yesterday.) Then when you
"ls" or "find" in /home1, it will look like /home. Note that your
current /home is not a filesystem, just a directory. "df" should also
show that you now have stuff in /home1. Before continuing, I would make
sure you have /home backed up somewhere!
Now you can "rm -rf /home". "df" should now show the available space on
/dev/hda2 increased by about the same amount as /dev/hda3 is used.
Now, you can either move /home1 to /home "mv /home1 /home" or link them
"ln -s /home1 /home". After either command, doing a "ls" or "find" in
/home should look just as you expect. Add /home to your fstab to make it
permanent, and you're done.
/dev/hda3 /home ext2 defaults 0 0
Hope this helps and is a little clearer. Email if you need anything
else.
randy
--
Randy Schrickel, RABA Technologies, Columbia, MD
Individuals committed to excellence.
My opinions, not my employer's.
http://www.raba.com/~randy (that's "tilde"randy, not "space"randy)
--
PLEASE read the Red Hat FAQ, Tips, Errata and the MAILING LIST ARCHIVES!
________________________________________________________________________
http://www.redhat.com/RedHat-FAQ http://www.redhat.com/RedHat-Errata
http://www.redhat.com/RedHat-Tips http://www.redhat.com/mailing-lists
------------------------------------------------------------------------
To unsubscribe: mail -s unsubscribe redhat-list-request@redhat.com < /dev/null
