bin/92723: [feature request] fdisk(8) should be able to output
Jukka A. Ukkonen
jau at iki.fi
Fri Mar 9 07:30:11 UTC 2007
The following reply was made to PR bin/92723; it has been noted by GNATS.
From: jau at iki.fi (Jukka A. Ukkonen)
To: bug-followup at FreeBSD.org
Subject: Re: bin/92723: [feature request] fdisk(8) should be able to output
Date: Fri, 9 Mar 2007 08:49:27 +0200 (EET)
Quoting Alex Kozlov:
> fdisk -s is close enough
If you are willing to do somewhat slow and also error prone
manual labor to recreate the exact same slices you have had
on another disk, then it is close enough.
If you want a production level approach to be always able
to automatically rebuild the same slices from another disk,
it is not close enough.
You now have to either manually convert the incompatible
current output to a compatible input file or manually feed
whatever slice specifications to rebuild.
Neither of which is really "production quality automation".
We already have bsdlabel/disklabel reading and writing the
same format which allows copying and rebuilding the exact
We already have "mount -p" to print out all currently mounted
volumes or individual new mount points as fstab entries to
automate mounting selected volumes to the same locations they
are currently mounted to. (I.e. "mount -p" writes properly
formatted configurations for "mount -a" to read.)
I personally donated the -p functionality, because Sun had it
while we did not. So, in that sense I think I know what I am
Fdisk is an exception in this series, and clearly not really
production quality as it cannot read its own output.
Your "close enough" assumes willingness for laborous and error
prone human action.
I am no way claiming using "fdisk -s" output is not doable.
It certainly is doable given some time and risking human error.
I am claiming it is not worthy of a production quality system.
Assuming you are intending to use the rebuilt slices e.g. as
parts of geom mirrors they have to match exactly. Any rounding
error or mistyping etc. will cause a failure to insert the
slice to the mirror while the clock is ticking all the time.
This happened to me once and it is definitely not production
quality, if quick recovery suddenly becomes wrestling with
So, close enough is not actually close enough. It is artistic
approach fitting maybe Linux, but we are not just Linux, right?
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/ Jukka A. Ukkonen, Oxit Ltd, Finland
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