Mounting ext2fs USB-drive fails. "wrong magic number"

N

Nordmann

Hiyas

I had a dedicated linux box (opensuse) serving as a samba/http/ftp server, holding 4TB of data on a software raid array. I've always felt that the box was sluggish so I decided I wanted to change the system..

Long story short, I copied all my data to external USB hard drives formatted as ext2, installed FreeBSD 8.0 RELEASE, got everything I want set up and working perfectly and now I can't make FreeBSD see my USB drive. :\

dmesg when I plug in the USB drive
Code: 
ugen3.2: <Sunplus Technology Inc.> at usbus3
umass0: <Bulk Only Interface> on usbus3
umass0:  SCSI over Bulk-Only; quirks = 0x4000
umass0:0:0:-1: Attached to scbus0
da0 at umass-sim0 bus 0 target 0 lun 0
da0: <ST350032 0AS > Fixed Direct Access SCSI-2 device 
da0: 40.000MB/s transfers
da0: 476940MB (976773168 512 byte sectors: 255H 63S/T 60801C)

entering 'mount -t ext2fs /dev/da0s1 /mnt/usb' fails and this line pops up in dmesg

Code: 
ext2fs: da0s1: wrong magic number 0x10 (expected 0xef53)

why does this happen, and what can I do to fix this?
 
FreeBSD supports ext2 filesystem with 128 inode size, there are some patches to extend that support to filesystems created with inode size 256 (but now there is also possibility for 512 inode size filesystems, thanks goes to Linux community ...).

So you will have to check the inode size of that ext2 filesystem:0

% tune2fs -l /dev/${DISK} | grep -i 'inode size'
Inode size: 128

Such filesystem can be created that way (same in FreeBSD/Linux):
# mkfs.ext2 -I 128 /dev/md1

tune2fs is part of e2fsprogs package:
% pkg_info -L -x e2fsprogs | grep tune2fs
/usr/local/man/man8/tune2fs.8.gz
/usr/local/sbin/tune2fs
 
I see.

Is the same problem that ext2ifs for windows has then, it can't read disks with more inodes than 128.. and thus I can not just install that and transfer the files over ethernet from my windows machine.

You mentioned patches?
is there a way I can make the FreeBSD box read the disks?
I'm currently trying to move the data across ethernet through my netbook running a ubuntu live CD. 4TB at 7.9MB/s is gonna take a while, don't ask why, it just is :O

So I'm open for suggestions.. :)
 
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