Carlos E. R. wrote:
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The Tuesday 2008-01-08 at 13:30 -0000, Dave Howorth wrote:
Bill Anderson wrote:
Insults are much easier than courtesy.
You've been suffering a lot from insults and disbelievers and I don't
understand why :(
I didn't post before because I thought I didn't have access to a Unix
box. Then I remembered that there is some old iron here. FWIW, here are
some samples from a session I just ran:
Compaq Tru64 UNIX V5.1B (Rev. 2650); Tue Sep 2 17:51:37 BST 2003
% ls -ld /bin
lrwxr-xr-x 1 root system 7 Aug 22 2003 /bin@ -> usr/bin/
% ls -l /bin/sh
-rwxr-xr-x 2 bin bin 149840 Apr 15 2003 /bin/sh*
% df -h
Filesystem Size Used Available Capacity Mounted on
/dev/disk/dsk0a 240M 208M 7666K 97% /
/dev/disk/dsk0g 1923M 1335M 395M 78% /usr
Ok, question then.
What will happen during boot, if partition /usr fails the initial
filecheck? It can not be mounted, it has to be repaired first; but the
system can not drop you into a repair mode with a shell, because the
shell resides in /usr/bin/
Unix admins do not normally create a separate partition for /usr. In
Unix, it is a relatively static directory. Also, you need to kick the
partition thing, it is an x86ism. Under AIX, there is a root logical
volume. One could create separate LVs for /tmp, /var, and /home. Under
Solaris, it is slices, and one could create a separate slice for /usr
and /home, under the default setup.
If you cannot mount /usr, then you get a mount failure. Depending on the
machine, one could a console message, or one just get to read the
numbers on an RS6000. To correct problems, I can always boot into the
firmware.
What does that unix do? Does it mount /usr readonly?
The boot halts.
Under ForPro (another version of Unix for those who remember Fortune
Systems), the solution was that /usr/bin had a minimum set of utilities.
Of course, the mount of another "partition" on /usr meant then overlaid
those utilities.
Anyway, discussion of Unix is OT.
- -- Cheers,
Carlos E. R.
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