The SYS volume is denied access

I have an HP Proliant BL25 server running netware 6.5. The sys volume was originally created with a 400Mb mirrored partition. However, now the partition has shrunk to 40mg and all users including the admin are denied access to the sys volume. You can see the mapped drive from the user desktop but when you try to click on it access is denied. All other volumes are accessable and are running normally. I am however, able load modules and see sys files and folders from the server console. I’ve also tried running ds repair’s unattened maintenance but the results are the same.

Does anyone have any advice before I wipe out the sys and repartition it?