Encountering PBS chdir /home/user1 failed. No such file or directory

If you encounter an error after you have qsub on Torque

PBS: chdir to /home/user1 failed: No such file or directory.

If you set OpenPBS to mail, you may see the issues more clearly
Post job file processing error; job 17676.headnode-h00 on host node-c05/7+node-c05/6+node-c05/5+node-c05/4+node-c05/3+node-c05/2+node-c05/1+node-c05/0Unknown resource type  REJHOST=node-c05 MSG=invalid home directory '/home/user1' specified, errno=2 (No such file or directory)

Apparently, the node 5 has the /home directory unmounted and  the job sent to them will be lost. The solution is very simple, remount the /home directory back again