filesystem compatibility between FreeBSD and OpenBSD

Chuck Robey chuckr at
Thu Apr 30 03:08:02 UTC 2009

Hash: SHA1

Daniel C. Dowse wrote:
> On Wed, 29 Apr 2009 14:36:31 -0400
> Chuck Robey <chuckr at> wrote:
>> Hash: SHA1
>> I just put a OpenBSD partition on a EIDE disk I had laying around.  I'd had some
>> advice (apparently bad) that the OpenBSD UFS filesystem could provide a
>> filesystem that I could access from FreeBSD ... least, just now when I tried to
>> mount either of the two filesystems I just created on FreeBSD, FreeBSD seems to
>> recognize the disklabel just fine (it sees, in /dev, both ad1s1d and ad1s1e),
>> but FreeBSD can't seem to mount either one.
>> Is there ANY filesystem that would be a good bet, so that I could transfer stuff
>>  to & from FreeBSD to OpenBSD?  Besides (obviously) UFS?
>> Thanks
> Hi Chuck,
> please tell us what exactly the output of mount is,  mount (8) on
> FreeBSD 7.1 tells me that UFS is the default filesystem to mount.

It just fails with an "Invalid argument", so I think it's not able to recognize
the OpenBSD FS.  I can't do it the other way around, because I can't (yet) find
the OpenBSD driver for my AMCC (3ware) 9650-4 controller (FreeBSD's twa driver).
 Otherwise, I'm curious if maybe OpenBSD count moount the FreeBSD FS.

No longer truly important, because i'm using an extra machine as a waypoint for
a transfer.
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