Dumping /usr to samba mounted drive

[Gayn Winters]

> From: Mike Loiterman [mailto:mike at ascendency.net] 
> Sent: Friday, February 03, 2006 9:09 PM
> To: gayn.winters at bristolsystems.com
> Cc: freebsd-questions at freebsd.org
> Subject: RE: Dumping /usr to samba mounted drive
> 
> 
> Gayn Winters <mailto:gayn.winters at bristolsystems.com> wrote:
> >> From: Mike Loiterman [mailto:mike at ascendency.net]
> >> Sent: Friday, February 03, 2006 12:46 PM
> >> To: gayn.winters at bristolsystems.com; freebsd-questions at freebsd.org
> >> Subject: RE: Dumping /usr to samba mounted drive
> >> 
> >> 
> >> Gayn Winters <mailto:gayn.winters at bristolsystems.com> wrote:
> >>>> [mailto:owner-freebsd-questions at freebsd.org] On Behalf Of Mike
> >>>> Loiterman Sent: Friday, February 03, 2006 6:05 AM
> >>>> To: freebsd-questions at freebsd.org
> >>>> Subject: RE: Dumping /usr to samba mounted drive
> >>>> 
> >>>> 
> >>>> Mike Loiterman <mailto:mike at ascendency.net> wrote:
> >>>>> I'm having trouble dumping /usr to a samba mounted drive.
> >>>>> The process dies over processing 4 gigs worth of data.
> >>>>> 
> >>>>> My other partitions dump fine, but they're all less than 4 gigs.
> >>>>> 
> >>>>> This is the error I'm getting:
> >>>>> 
> >>>>> DUMP: Date of this level 0 dump: Fri Feb  3 03:31:05 2006
> >>>>>    DUMP: Date of last level 0 dump: the epoch
> >>>>>    DUMP: Dumping snapshot of /dev/ar0s1f (/usr) to
> >>>>> /mnt/backup/usr-dump-l0
> >>>>>    DUMP: mapping (Pass I) [regular files]
> >>>>>    DUMP: mapping (Pass II) [directories]
> >>>>>    DUMP: estimated 10943850 tape blocks.
> >>>>>    DUMP: dumping (Pass III) [directories]
> >>>>>    DUMP: dumping (Pass IV) [regular files]
> >>>>>    DUMP: 6.73% done, finished in 1:09 at Fri Feb  3 
> 04:45:29 2006
> >>>>>    DUMP: 14.92% done, finished in 0:57 at Fri Feb  3 
> 04:38:12 2006
> >>>>>    DUMP: 22.98% done, finished in 0:50 at Fri Feb  3 
> 04:36:27 2006
> >>>>>    DUMP: 31.37% done, finished in 0:43 at Fri Feb  3 
> 04:34:56 2006
> >>>>>    DUMP: write error 4194320 blocks into volume 1
> >>>>> 
> >>>>> The same thing happens, although I get different errors, if I
> >>>>> use bzip2 or gunzip to compress the partition as it is being
> >>>>> dumped.  It obviously gets a lot further since it's
> >>>>> compressed, but it still dies right around 4 gigs.
> >>>>> 
> >>>>> How can I fix this?  Is this a samba limitation?
> >>> 
> >>>> 
> >>>> BTW, I'm running:
> >>>> 
> >>>> FreeBSD 6.0-RELEASE
> >>>> Samba 2.2.12_2
> >>>> 
> >>>> And transfering to unix formated drived mounted under Mac OS X
> >>>> 10.4.4.
> >>>> 
> >>>> Would upgrading to Samba 3.x help?
> >>>> 
> >>>> ------------------------------
> >>>> Mike Loiterman
> >>> 
> >>> Have you tried generating a file of size > 4GB on your mac mini?
> >>> 
> >>> 
> >> http://www.freebsdforums.org/forums/showthread>
> >> .php?p=203909#post203909 
> >> 
> >> Changing the format of the drive to Mac OS Extended fixed the
> >> problem.  UFS has a 4 gig file size limit.
> >> 
> > Mike,
> > 
> > I'm glad you got it working.  What was Apple ever thinking 
> with a 4GB
> > limit? 
> > 
> > -gayn
> 
> Did Apple develop the UFS spec or just implement it? 
> 
Mike,

I think our very own M.K. McKusick is credited with inventing UFS for
BSD 4.something.  I'm sure others on this list know the history better
than I do.  In particular, I don't know the historical difference
between FFS, UFS and UFS1.  [If one of you history buffs can elucidate,
please do so!] In any case, it looks like Apple chose an implementation
at the low end of the range of possible implementations.  Here is a
chart that I find useful:
http://www.mrsci.com/Computer-File-Systems/Comparison_of_file_systems.ph
p
Note the range of possible maximum file sizes on UFS1.  Also note the
4GB limit on FFS.  History aside, a 4GB limit for any modern file system
seems somewhat backward, especially for an avant garde company like
Apple.  Maybe they got carried away with the "mini" in "Mac mini"!

-gayn

Bristol Systems Inc.
714/532-6776
www.bristolsystems.com