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Date:      Fri, 11 May 2001 09:36:08 -0400
From:      sam <sam2539@the-beach.net>
To:        freebsd-questions@FreeBSD.org
Subject:   mount da0 da1 is it an illusion?
Message-ID:  <200105111234.f4BCYsG06204@newgate.miami.home>

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I am so confused.

The machine has 2 identical SCSI drives: size, manufacturer, what on 
them I'm not sure anymore.
# df
Filesystem  1K-blocks     Used    Avail Capacity  Mounted on
/dev/da0s1a     99183    27958    63291    31%    /
/dev/da0s1g   7203658    40912  6586454     1%    /home
/dev/da0s1f    992239   690397   222463    76%    /usr
/dev/da0s1e    127023     1804   115058     2%    /var
procfs              4        4        0   100%    /proc

I thought I was mounting the second drive by doing:

# mount da1s1 /BU
# cd /BU
# ls -l
drwxr-xr-x  15 root  wheel  2048 May  4 13:16 etc
drwxr-xr-x   5 root  wheel   512 May 11 05:35 home

BUT the second drive was once partitioned the same as the boot drive so 
the copied files are just going to "/" on the second drive in a small 
partition.
#df
Filesystem  1K-blocks     Used    Avail Capacity  Mounted on
/dev/da0s1a     99183    27958    63291    31%    /
/dev/da0s1g   7203658    40912  6586454     1%    /home
/dev/da0s1f    992239   690397   222463    76%    /usr
/dev/da0s1e    127023     1804   115058     2%    /var
procfs              4        4        0   100%    /proc
/dev/da1s1      99183    43280    47969    47%    /BU

See, it's half full and /BU is the same size as /.

#Now it's start getting more interesting.

So I thought, "how nice, I can mount all the partitions on da1 and copy 
the same file systems." Like:
/dev/da1s1a /BU
/dev/da1s1g /BUhome
And so on.

But there was no /dev/da1s1a. So being braver than smart, I don't read 
about MAKEDEV and do:
# MAKEDEV da1s1a.

I got lost but it appears to have made da1s1a - da1s1h?

BUT then it got really scary.

# mount /dev/da1s1a /BU
# cd /BU
# ls -l
-rw-r--r--   2 root  wheel      658 Nov 20 07:03 .cshrc
-rw-r--r--   2 root  wheel      251 Nov 20 07:03 .profile
-r--r--r--   1 root  wheel     4735 Nov 20 07:03 COPYRIGHT
drwxr-xr-x   2 root  wheel     1024 Mar 12 10:51 bin
drwxr-xr-x   3 root  wheel      512 Mar 12 10:52 boot
drwxr-xr-x   2 root  wheel      512 Mar 12 10:48 cdrom
lrwxr-xr-x   1 root  wheel       11 Mar 12 10:52 compat -> /usr/compat
drwxr-xr-x   3 root  wheel    13824 Mar 12 15:57 dev
drwxr-xr-x   2 root  wheel      512 Mar 12 10:48 dist
drwxr-xr-x  15 root  wheel     2048 Mar 15 11:03 etc
drwxr-xr-x   2 root  wheel      512 Mar 12 10:48 home
-r-xr-xr-x   1 root  wheel  3258128 Nov 20 08:02 kernel
-r-xr-xr-x   1 root  wheel  3258128 Nov 20 08:02 kernel.GENERIC
drwxr-xr-x   2 root  wheel      512 Nov 20 06:56 mnt
drwxr-xr-x   2 root  wheel     2560 Mar 12 10:48 modules
dr-xr-xr-x   2 root  wheel      512 Nov 20 06:56 proc
drwxr-xr-x   2 root  wheel      512 Mar 12 10:48 root
drwxr-xr-x   2 root  wheel     2048 Mar 12 10:51 sbin
drwxr-xr-x   4 root  wheel     1024 Mar 12 10:48 stand
lrwxrwxrwx   1 root  wheel       11 Mar 12 10:49 sys -> usr/src/sys
drwxrwxrwt   2 root  wheel      512 Mar 15 11:04 tmp
drwxr-xr-x   2 root  wheel      512 Mar 12 10:48 usr
drwxr-xr-x   2 root  wheel      512 Mar 12 10:48 var

What the hell is that. I almost did:
# cd /BU
# rm -R *

Thinking I was looking at some old installation on the second disk.

It's an illusion. It must be the way I did MAKEDEV right? da0s1a and 
da1s1a are the same thing???

If you're still with me. I think I need to reformat the second disk. But 
I'm not sure what's real and what's an illusion.

Look at the line below labeled "disk:" after  disklabel -r for both da0 
and da1:

ns1[/]# disklabel -r da0s1
# /dev/da0s1c:
type: SCSI
disk: da0s1

ns1[/]# disklabel -r da1s1
# /dev/da1s1c:
type: SCSI
disk: da0s1

Obviously I am clueless. I'll go google and man for few hours now.

Please, if anyone can shed some light.



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