Sometimes when you cannot add a filer to DFM it is because
the host where DFM is running does not have enough free space
in the DFM install filesystem.
You can check the free space by doing a 'dfm about' command.
Make sure there is enough free space in the install directory.
linux > dfm about
Version 4.0.1 (4.0.1)
Serial Number XX
Administrator Name XX
Host Name XX
Host IP Address XX
Host Full Name XX
Operations Manager Node limit 10 (currently managing 2)
Provisioning Manager Node Limit 10 (currently managing 2)
Protection Manager Node Limit 10 (currently managing 2)
Operating System Red Hat Enterprise Linux Server release 5.5 (Tikanga) 2.6.18-194.el5 x86_64
CPU Count 2
System Memory 2011 MB (load excluding cached memory: 25%)
Installation Directory /opt/NTAPdfm
10.2 GB free (66.1%) <<<<< if there's not enough free space you will see an error message here
Perf Data Directory /opt/NTAPdfm/perfdata
.
.
.
If you see an error, then you'll need to remove some files or grow the filesystem.