UFS mount failure - disk slice created on and64, unable to mount on sparc64

Vasile Buruiana bvasea at gmail.com
Sat Oct 17 19:38:24 UTC 2015

Yesm I played with a harddisk connected via IDE to the sun and later
to the laptop via USB-to-IDE adapter. Currently I'm trying to
buildworkd+buildkernel on the sun using some contents of the /usr/obj
cross-compiled on the amd-64 laptop to speed up the process (that's
how I found the problem), so I'm writing these from my memory:

This happened on the SUN:

gpart create -s mbr ada0
gpart add -t freebsd ada0
gpart create -s bsd ada0s1
gpart add -s 1G -t freebsd-zfs ada0s1

newfs -U /dev/ada0s1

copy stuff, umount, invalid argument while attempting to mount on the laptop.

gpart create -s vtoc8 ada0
gpart add -t freebsd ada0
gpart create -s bsd da0s1
gpart add -s 1G -t freebsd-zfs ada0s1
newfs -U /dev/ada0s1

copy suff, unmount, again invalid argument while attempting to mount
on the laptop.

Same when creating on the laptop and mounting on the sun.

When moving the harddisk from one unit to the other, at boot (or at
usb insert) the kernel reports:
g_dev_taste: make_dev_p() failed (gp->name=da0a, error=17)     or ada0a
and many slices appear in /dev:
(or ada0s1a, ada0s1aa, ada0s1ab, ada0s1b, ada0s1bb, ada0s1c, ada0s1ca
on the sparc64....)

and so on, same for mbr/vtoc8, same for bsd/zfs.

These are some geom-relaed errors as I read on some other mailing
lists, so I tried to identify the problem by simplifying things until
I reduced everything to image file attached to md.

The Sparc also ran a FreeBSD 6.1-release perfectly, the ufs mbr
partition could be mounted on a x86 for fsck or other maintenance with
absolutely no problems. Seems that the advances in technology are
still causing headaches in keeping the things simple.

I will try to makefs -B big on the amd64 but I doubt i will also be
able to mount it on the same machine.

Best wishes

On 10/17/15, John-Mark Gurney <jmg at funkthat.com> wrote:
> Vasile Buruiana wrote this message on Sat, Oct 17, 2015 at 21:32 +0300:
>> Found a bug in FreeBSD 10.2.
>> An UFS disk slice created under sparc64 cannot be mounted under amd64.
>> And reverse:  UFS disk slice created under amd64 cannot be mounted
>> under sparc64. This also happens with hard disks on both MBR and VTOC8
>> partition schemes, on both UFS and ZFS filesystems.
> Sadly, this is due to the fact that sparc64 is big endian, and our UFS
> implementation isn't bi-endian...  If you need to make a UFS file system
> on amd64 for use on sparc64, use the makefs utility w/ the option -B big
> to create it...
> Just ran into the same issue on an EdgeRouter Lite, which is a big
> endian MIPS64 machine...
> Though I'm a bit surprized that it happens w/ ZFS as ZFS is suppose
> to support either endianness automaticly..  Did you try this on raw
> disks?
> --
>   John-Mark Gurney				Voice: +1 415 225 5579
>      "All that I will do, has been done, All that I have, has not."

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