can't define disk volume

Hi, All,

One strange problem: I'm running TSM 5.1.6 on AIX5.1, when I try to create a
new disk volume using "def vol collodisk /dev/rtsmcollodisk10", I got below
error:
ANR2404E DEFINE VOLUME: Volume /dev/rtsmcollodisk10 is not available.
ANS8001I Return code 14.

And in activity log, it shows:

ANR7805E Volume /dev/rtsmcollodisk10 is in use by another server.
ANR2404E DEFINE VOLUME: Volume /dev/rtsmcollodisk10 is not available.

If I delete the raw volume in AIX and recreate it as /dev/rtsmcollodisk101,
then I could defined it in TSM without problem, it seems TSM just don't like
the specific name, although I created volume from /dev/rtsmcollodisk01-25
without any problem.
It doesn't hurt anything but it's so annoying, anybody has any clue why this
happens?

Regards,
Fred Yang
NSLIJ Information Service
perotsystems