Diskmanagement does not show drive letter

Hi,

Got a problemem with mounting drives on an windows 2003 Enterprise server SP2.

After mounting a disk from a san the windows server does not show a drive

letter to the mounted disk. Windows explorer does show a drive letter,

windows command does show a drive letter but under windows disk management

there is no drive letter assigned to the disk.

If you want to add a drive letter to the disk it gives a error, but in you

got to the explorer of command prompt you can browse to the folder and files.

After a server reset a drive letter is assigned and is working fine.

The reason why restating is not an option is that the mounted disk must be

available for the backup. So restarting the server several times a night is

not really a solution.

Anybody an idea why windows is behaving like this, and even more important

is there a know solution to it beside restarting the server.

Thanks