Salvage files from harddrive

[jeffry killen]

Hello;
I have a hard drive that contains the /var file system in a system that
will not boot.
In single user mode I can mount  /var.

I want to take this disk and put it in another FreeBSD system and
try to copy the files I need off of it to a safe place.

The system I will plug it into will also have a separate disk with
/var.

Is there going to be a conflict with the labels and how would I
best go about this?

system is FreeBSD v6.2

Thank you in advance for guidance, suggestions.
JK

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[Henrik Hudson]

On Fri, 07 Oct 2011, jeffry killen wrote:

> Hello;
> I have a hard drive that contains the /var file system in a system that
> will not boot.
> In single user mode I can mount  /var.
>
> I want to take this disk and put it in another FreeBSD system and
> try to copy the files I need off of it to a safe place.
>
> The system I will plug it into will also have a separate disk with
> /var.
>
> Is there going to be a conflict with the labels and how would I
> best go about this?
>
> system is FreeBSD v6.2
>
> Thank you in advance for guidance, suggestions.

It shouldn't be a problem. If you stick the "broken" drive in a new
system it will show up as a new device to the 2nd system.

You will then manually mount the 1st system via the device node to
wherever you want. It will not auto-mount that to /var .

So, for example your 2nd system has /dev/ad4s1  as its main disk.
When you plig the 2nd disk (from the old box) it will show up as
/dev/ad5s1 or similar. YOu would then just mount the /var/ slice to
wherever you want.

For example:
mount /dev/ad5sa6 /mnt/oldvar

or similar. Please note that your device nodes and slice numbers
will most likely be different.

Henrik
--
Henrik Hudson
lists@...
-----------------------------------------
"God, root, what is difference?" Pitr; UF

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[jhell]

On Tue, 6 Oct 2009 16:14 -0800, lists@ wrote:

> On Fri, 07 Oct 2011, jeffry killen wrote:
>
>> Hello;
>> I have a hard drive that contains the /var file system in a system that
>> will not boot.
>> In single user mode I can mount  /var.
>>
>> I want to take this disk and put it in another FreeBSD system and
>> try to copy the files I need off of it to a safe place.
>>
>> The system I will plug it into will also have a separate disk with
>> /var.
>>
>> Is there going to be a conflict with the labels and how would I
>> best go about this?
>>
>> system is FreeBSD v6.2
>>
>> Thank you in advance for guidance, suggestions.
>
> It shouldn't be a problem. If you stick the "broken" drive in a new
> system it will show up as a new device to the 2nd system.
>
> You will then manually mount the 1st system via the device node to
> wherever you want. It will not auto-mount that to /var .
>
> So, for example your 2nd system has /dev/ad4s1  as its main disk.
> When you plig the 2nd disk (from the old box) it will show up as
> /dev/ad5s1 or similar. YOu would then just mount the /var/ slice to
> wherever you want.
>
> For example:
> mount /dev/ad5sa6 /mnt/oldvar
>
> or similar. Please note that your device nodes and slice numbers
> will most likely be different.
>
> Henrik
>

I think (correct me if I am wrong) he is trying to describe that glabel is
being used on both systems and that he is worried that a label of "var"
that would be in /dev/ufs/var on two separate disks would be conflicting
and which one would be mounted first as he does not wish for the disk he
is trying to save the contents of to be mounted and be used as the var of
the system he is placing the said disk he wants to recover.

--

%{----------------------------------------------------+
  | dataix.net!jhell         2048R/89D8547E 2009-09-30 |
  | BSD since FreeBSD 4.2    Linux since Slackware 2.1 |
  | 85EF E26B 07BB 3777 76BE  B12A 9057 8789 89D8 547E |
  +----------------------------------------------------%}
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[jhell]

On Fri, 7 Oct 2011 04:07 -0700, jekillen@ wrote:

> Hello;
> I have a hard drive that contains the /var file system in a system that
> will not boot.
> In single user mode I can mount  /var.
>
> I want to take this disk and put it in another FreeBSD system and
> try to copy the files I need off of it to a safe place.
>
> The system I will plug it into will also have a separate disk with
> /var.
>
> Is there going to be a conflict with the labels and how would I
> best go about this?
>
> system is FreeBSD v6.2
>
> Thank you in advance for guidance, suggestions.
> JK
> _______________________________________________
> freebsd-questions@... mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-questions
> To unsubscribe, send any mail to "freebsd-questions-unsubscribe@..."
>

If you can mount this disk in single user mode your best bet to be safe is
just glabel it to something else that your second system is not before you
take the disk out of the machine.

Even though I don't think it should/would be a problem I can not speak of a
authoritative nature on this subject because I have not had to test such
cases.

Best regards.

--

%{----------------------------------------------------+
  | dataix.net!jhell         2048R/89D8547E 2009-09-30 |
  | BSD since FreeBSD 4.2    Linux since Slackware 2.1 |
  | 85EF E26B 07BB 3777 76BE  B12A 9057 8789 89D8 547E |
  +----------------------------------------------------%}
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[tomasz dereszynski]

jeffry killen wrote:

> Hello;
> I have a hard drive that contains the /var file system in a system that
> will not boot.
> In single user mode I can mount  /var.
>
> I want to take this disk and put it in another FreeBSD system and
> try to copy the files I need off of it to a safe place.
>
> The system I will plug it into will also have a separate disk with
> /var.
>
> Is there going to be a conflict with the labels and how would I
> best go about this?
>
> system is FreeBSD v6.2
>
> Thank you in advance for guidance, suggestions.
> JK

Nay,

you need to check as what 'device' that partition has been recognised on
your 'new' system and mount it wherever you like
e.g.

mkdir /tmp/old-var
mount /dev/da0s1a /mnt/old-var

--
bEsT rEgArDs            |       "Confidence is what you have before you
tomasz dereszynski      |       understand the problem." -- Woody Allen
                        |      
Spes confisa Deo        |       "In theory, theory and practice are much
numquam confusa recedit |       the same. In practice they are very
                        |       different." -- Albert Einstein


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[RW-15]

On Tue, 6 Oct 2009 20:50:39 -0400
jhell <jhell@...> wrote:


> If you can mount this disk in single user mode your best bet to be
> safe is just glabel it to something else that your second system is
> not before you take the disk out of the machine.
>
> Even though I don't think it should/would be a problem I can not
> speak of a authoritative nature on this subject because I have not
> had to test such cases.

Personally, I don't think this practise of labelling partitions with
names like var makes any sense. fstab exists to keep track of what
devices map to which mount points, the point of glabel is to give those
devices unique names that are independent of where and when they
are detected.

I think people get the idea that if they use labels like var they'll
never need to edit fstab again.  The benefit of that is negligible, it's
much easier and less confusing to make minor changes to fstab when you
copy it to a new disk than it is to shuffle labels around.
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