Won't mount

[de5@xxxxxxxxxxxxxxxxx]

I unmounted the IRIX filesystem I mounted a couple days ago, but it
won't mount now:

# mount -t xfs /dev/sda /mnt
mount: wrong fs type, bad option, bad superblock on /dev/sda,
       or too many mounted file systems

The fs type is right, the options worked before, the fs is definitely
unmounted:

# df
Filesystem           1k-blocks      Used Available Use% Mounted on
/dev/ide/host0/bus0/target0/lun0/part6
                       1011928    146032    814492  16% /
/dev/ide/host0/bus0/target0/lun0/part1
                         23302     14324      7775  65% /boot
/dev/ide/host0/bus0/target0/lun0/part8
                      24825848   6514916  17049832  28% /home
/dev/ide/host0/bus0/target0/lun0/part5
                       3028080   2104668    769592  74% /usr

-Dave