xfs_repair: bad primary superblock - bad magic number !!!

[Patrick Hsieh <pahud@ezplay.tv>]

Hello list,

I am running woody with 2.4.19 and xfs patch for 2.4.19 from SGI ftp
site. Whey I type xfs_repair /dev/hda, I got the error

 root@et:~# xfs_repair /dev/hda
Phase 1 - find and verify superblock...
bad primary superblock - bad magic number !!!


Is there something wrong? Should I unmount the filesystem before
performing xfs_repair?

-- 
Patrick Hsieh <pahud@ezplay.tv>

GPG public key http://pahud.net/pubkeys/pahudatezplay.gpg