When the objects you are working with in your model are very large and your server has been setup with a /tmp location that isn't large enough you may see “Write” errors or other strange errors referencing the directory “/tmp”. They are a result of running out of disk space on /tmp.

This can be fixed by setting up tool to use the home directory of the account as it's temp directory:

• Login as the model account
• Make a directory for the temp files to go:

 mkdir tmp 

• Edit the account's tools.init file trough the drive mapping and set the $tmpDir to the location you just made. This line should be added to your tools.init file:

 $tmpDir = "/models/modelAccountName/tmp"