Raid dont restart

Hello

i use Raid software on a Rh 9 box but i have the md4 down

md4 : active raid1 hda7[0]
61368192 blocks [2/1] [U_]

i have try to reboot or restart it so but it can't

raidstart /dev/md4
/dev/md4: already running

raidstop /dev/md4
/dev/md4: Device or resource busy

what can i do?

 

 

 

 

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