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umount bad disk
I use HBase0.96 and CDH4.3.1.

I use Short-Circuit Local Read:

<property>
  <name>dfs.client.read.shortcircuit</name>
  <value>true</value></property><property>
  <name>dfs.domain.socket.path</name>
  <value>/home/hadoop/cdh4-dn-socket/dn_socket</value></property>

When one disk is bad, because the RegionServer open some file on the
disk, so I don't run "umount", example:
sudo umount -f /disk10
umount2: Device or resource busy
umount: /disk10: device is busy
umount2: Device or resource busy
umount: /disk10: device is busy

I must stop RegionServer in order to run umount command.
How can don't stop RegionServer and delete the bad disk.

Thanks,

LiuLei