Carlos E. R. wrote:
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> The Tuesday 2008-01-08 at 09:29 -0700, Bill Anderson wrote:
>
>>>> % 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.
>
> Ok, whatever you name them, the significance is that /usr
> is mounted separately above, as 'df' shows :-)
>
>
>> 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.
>
> Aha. Which is precisely the point for having certain programs
> in Linux residing in /bin, and it not being a symlink to /usr.
> Linux handles better that situation, IMHO.
Yes. Linux still has them in the original location (/bin).
Why in the world they were moved in AIX, Solaris and HP-UX
is beyond me. It's not "heretical", merely nonsensical.
>
> What is the advantage of having that symlink, then? There surely
must be something.
As someone with 25 years of experience with Unix, I
know of NONE.
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