xfs分区不能挂载

freethirsty

系统出现故障，无法挂载其他分区，求教高手，
penny:/home/pdt1331# mount -a
mount: wrong fs type, bad option, bad superblock on /dev/sda6,
       missing codepage or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

penny:/home/pdt1331# dmesg | tail
SGI XFS Quota Management subsystem
XFS: bad magic number
XFS: SB validate failed
eth0: Media Link On 100mbps full-duplex
NET: Registered protocol family 10
lo: Disabled Privacy Extensions
IPv6 over IPv4 tunneling driver
eth0: no IPv6 routers present
XFS: bad magic number
XFS: SB validate failed
penny:/home/pdt1331# xfs_repair
Usage: xfs_repair [-nLvV] [-o subopt[=value]] [-l logdev] [-r rtdev] devname
penny:/home/pdt1331# xfs_repair /dev/sda6
Phase 1 - find and verify superblock...
bad primary superblock - bad magic number !!!

attempting to find secondary superblock...
.....................................................................................................................................................................Sorry, could not find valid secondary superblock
Exiting now.
请问 该怎么办？