RE: Dumping /usr to samba mounted drive

From: Mike Loiterman [mailto:mike@xxxxxxxxxxxxxx]
Sent: Friday, February 03, 2006 9:09 PM
To: gayn.winters@xxxxxxxxxxxxxxxxxx
Cc: freebsd-questions@xxxxxxxxxxx
Subject: RE: Dumping /usr to samba mounted drive


Gayn Winters <mailto:gayn.winters@xxxxxxxxxxxxxxxxxx> wrote:
From: Mike Loiterman [mailto:mike@xxxxxxxxxxxxxx]
Sent: Friday, February 03, 2006 12:46 PM
To: gayn.winters@xxxxxxxxxxxxxxxxxx; freebsd-questions@xxxxxxxxxxx
Subject: RE: Dumping /usr to samba mounted drive


Gayn Winters <mailto:gayn.winters@xxxxxxxxxxxxxxxxxx> wrote:
[mailto:owner-freebsd-questions@xxxxxxxxxxx] On Behalf Of Mike
Loiterman Sent: Friday, February 03, 2006 6:05 AM
To: freebsd-questions@xxxxxxxxxxx
Subject: RE: Dumping /usr to samba mounted drive


Mike Loiterman <mailto:mike@xxxxxxxxxxxxxx> 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


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