I have a few machines that mount and call OCSSW in the same way. Some run CentOS 6.9 some 7.4 eg:
[root@seabird ~]# cat /etc/redhat-release
CentOS release 6.9 (Final)
[root@seabird ~]# python -V
[root@searobin ~]# cat /etc/redhat-release
CentOS Linux release 7.4.1708 (Core)
[root@searobin ~]# python -V
We are having problems with getanc.py for GOCI files on the 6.9 versions.
In the CentOS 7.4/python 2.7.5, the getanc.py works fine on VIIRS, MODIS, and GOCI files (only tested those) .
In the CentOS 6.9/pythone 2.6.6 the getanc.py works fine on VIIRS, MODIS, but FAILS on GOCI files.
I am attaching the output from the successes and failures.
https://www.python.org/download/releases/2.6/ ...2008 is a while ago...
Others have seen this problem: https://github.com/galaxyproject/planemo/issues/371
...short answer, not something we're going to fix.