[1278] in RedHat Linux List
Re: Weird mount problem!
daemon@ATHENA.MIT.EDU (Mike Sangrey)
Sun Oct 27 12:37:24 1996
To: redhat-list@redhat.com
In-reply-to: Your message of "Sun, 27 Oct 1996 09:00:43 EST."
<Pine.LNX.3.91.961027085420.545A-100000@glink.glcom.com>
Date: Sun, 27 Oct 1996 12:31:03 -0500
From: Mike Sangrey <mike@sojurn.lns.pa.us>
Resent-From: redhat-list@redhat.com
Reply-To: redhat-list@redhat.com
>
> I have a weird problem. Here are my mounts (as read from fstab).
>
> ----
> #
> # /etc/fstab
> #
> # You should be using fstool (control-panel) to edit this!
> #
> # <device> <mountpoint> <filesystemtype> <options> <dump> <fsckorder>
>
> /dev/hda2 / ext2 defaults 1 1
> /dev/hdc1 /a ext2 defaults 1 1
> /dev/hda1 /dosc msdos defaults 0 0
> /dev/hdb /mnt/cdrom iso9660 ro 0 0
> /dev/fd0 /mnt/floppy ext2 defaults,noauto 0 0
> /dev/hda3 none ext2 defaults 0 0
> /proc /proc proc defaults
> /dev/hda4 none swap sw
> /dev/hdc2 none swap sw
> ----------
>
>
> 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. 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 like a regular printed page would "shine through" an acetate sheet laid on top. What is neat about this, is you can then change files that are on that CDROM (or at least the changes appear to "hit" the CDROM). However, the changed files get written to /dev/hda3. It has real world application to Revision Control Systems where revisions are mapped as layers on top of the underlying version.
What you did was place a nice clean piece of paper over your doctoral thesis. And then said, "Gad Zooks Batman, where's my thesis?"
Anyway, I'll pipe down now; hope this helps the understanding.
--
Mike Sangrey <mike@sojurn.lns.pa.us> (Home)
<Mike.Sangrey@specmarkmet.com>(Work)
"I've trademarked `William Della Croce, Jr.(tm)'.
Anyone using this name owes me $1,000,000."
--
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