I'm trying to mount a UFS partition on a Sunfire V20z running 2.6.9 with UFS support. I inherited the box and it has Solaris 10 and Linux on it. I can use grub and boot into both Solaris 10 and Linux. Here is the error:

[root@sunfirev20z ~]# !974
mount -t ufs -o ufstype=sunx86 /dev/sda1 /solaris
mount: wrong fs type, bad option, bad superblock on /dev/sda1,
or too many mounted file systems

Here is the output of fdisk and sfdisk:

[root@sunfirev20z ~]# fdisk -l

Disk /dev/sda: 73.4 GB, 73407868928 bytes
255 heads, 63 sectors/track, 8924 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 2 4208 33792727+ bf Solaris
/dev/sda2 4209 8500 34475490 83 Linux
/dev/sda3 8501 8501 8032+ 5 Extended

[root@sunfirev20z ~]# sfdisk -l

Disk /dev/sda: 8924 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

Device Boot Start End #cyls #blocks Id System
/dev/sda1 * 1 4207 4207 33792727+ bf Solaris
/dev/sda2 4208 8499 4292 34475490 83 Linux
/dev/sda3 8500 8500 1 8032+ 5 Extended
/dev/sda4 0 - 0 0 0 Empty
Warning: start=16065 - this looks like a partition rather than
the entire disk. Using fdisk on it is probably meaningless.
[Use the --force option if you really want this]

Probably you must have a UFS fs support turned on in kernel, try check this at first, but i'm not sure.

I built a new kernel with UFS support and that was the kernel I was running that gets the error.