I could locate the article (Late Breaking News or LBN) which talks about issue of SF 6.0 on RHEL 6.5 however couldn't locate one for SF 6.1
http://www.symantec.com/docs/TECH164885
From the above article
Support for Red Hat Enterprise Linux 6 Update 5 (RHEL 6.5) on SFHA Solutions
A compatibility issue has been discovered on Red Hat Enterprise Linux 6 update 5 (RHEL 6.5) with Storage Foundation and High Availability Solutions 6.0.1, 6.0.2 & 6.0.3. The symptom is that the VxFS component cannot be loaded or used. Symantec have released a Public patch for SFHA 6.0.3 to resolve this issue. Customers at SFHA 6.0.1 or 6.0.2 are required to upgrade to SFHA 6.0.3 before installing this patch.
So far on LBN for 6.1 doesn't talk about this issue.
http://www.symantec.com/docs/TECH211540
Is it the same problem you are facing ?
G