mkfs.xfs problem

[Matus Lovecky <matus.a.lovecky@xxxxxxxxxxx>]

Hallo,

I have a following problem:
when I try to mkfs.xfs my /dev/sda1, I got an error message saing: 
mkfs.xfs: /dev/sda1 contains a mounted filesystem

but this is not thuth according to cat /etc/mtab:

any helpful suggestions?
Thank you m.




root@local ~ >fdisk /dev/sda
Command (m for help): p
Disk /dev/sda: 255 heads, 63 sectors, 243 cylinders
Units = cylinders of 16065 * 512 bytes
  Device Boot    Start       End    Blocks   Id  System
/dev/sda1             1       243   1951897   83  Linux
Command (m for help): q
root@local ~ >
root@local ~ >
root@local ~ >
root@local ~ >
root@local ~ >
root@local ~ >
root@local ~ >
root@local ~ >cat /etc/mtab
/dev/hda1 / ext3 rw 0 0
none /dev/pts devpts rw,gid=5,mode=620 0 0
none /proc proc rw 0 0
/mnt/hdc1 /home none rw,bind 0 0
/dev/hdb1 /mnt/hdb1 xfs rw 0 0
/dev/hdc1 /mnt/hdc1 xfs rw 0 0
/mnt/hdc1 /home none rw,bind 0 0
/mnt/hdb1 /home/matus none rw,bind 0 0
/home/mina/_doc/knihy /home/pub/knihy none rw,bind 0 0
/mnt/hdc1 /home none rw,bind 0 0
/mnt/hdb1 /home/mina none rw,bind 0 0
/home/mina/_doc/knihy /home/pub/knihy none rw,bind 0 0
/home/mina/_mm/mov/filmy /home/pub/mov none rw,bind 0 0
root@local ~ >
root@local ~ >
root@local ~ >
root@local ~ >
root@local ~ >
root@local ~ >
root@local ~ >
root@local ~ >mkfs.xfs -V
mkfs.xfs version 2.3.9
root@local ~ >
root@local ~ >
root@local ~ >
root@local ~ >
root@local ~ >
root@local ~ >
root@local ~ >mkfs.xfs -f /dev/sda1
mkfs.xfs: /dev/sda1 contains a mounted filesystem
Usage: mkfs.xfs
/* blocksize */         [-b log=n|size=num]
/* data subvol */       [-d agcount=n,agsize=n,file,name=xxx,size=num,
                           (sunit=value,swidth=value|su=num,sw=num),
                           unwritten=0|1]
/* inode size */        [-i log=n|perblock=n|size=num,maxpct=n]
/* log subvol */        [-l agnum=n,internal,size=num,logdev=xxx
                           version=n,sunit=value|su=num]
/* label */             [-L label (maximum 12 characters)]
/* naming */            [-n log=n|size=num,version=n]
/* prototype file */    [-p fname]
/* quiet */             [-q]
/* realtime subvol */   [-r extsize=num,size=num,rtdev=xxx]
/* sectorsize */        [-s log=n|size=num]
/* version */           [-V]
                       devicename
<devicename> is required unless -d name=xxx is given.
Internal log by default, size is scaled from 1,000 blocks to 32,768 blocks
based on the filesystem size.  Default log reaches its largest size at 1TB.
This can be overridden with the -l options or using a volume manager with a
log subvolume.
<num> is xxx (bytes), xxxs (sectors), xxxb (fs blocks), xxxk (xxx KB),
     or xxxm (xxx MB)
<value> is xxx (512 blocks).
root@local ~ >