Moved from the Cluster Services forum:

I have a two-node cluster running NW65SP6 with shared storage hosting a
2TB NSS volume. Users are complaining that when they try to write
files to the volume they are getting an "out of disk space" error. I can
write to it just fine. It's not a server license issue. The clients are
running 4.91SP2.

Does anyone have any idea what could be causing this?