I forgot to mention it specifically by name, but GFS is supported, as LSC mentioned. However, it is not free ($2200/year). See https://www.redhat.com/apps/store/enterprise/gfs.html. Also, it does not support OCR and voting disks--just database files and shared OH as documented in 329530.1. Dan ----- Original Message ---- From: "Kerber, Andrew W." <Andrew.Kerber@xxxxxxx> To: dannorris@xxxxxxxxxxxxx; oracle-l@xxxxxxxxxxxxx Sent: Tuesday, September 4, 2007 9:20:59 AM Subject: RE: RAC File System Questions <!-- _filtered {font-family:Tahoma;panose-1:2 11 6 4 3 5 4 4 2 4;} _filtered {font-family:"Book Antiqua";panose-1:2 4 6 2 5 3 5 3 3 4;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:12.0pt;font-family:"Times New Roman";} a:link, span.MsoHyperlink {color:blue;text-decoration:underline;} a:visited, span.MsoHyperlinkFollowed {color:blue;text-decoration:underline;} p {margin-right:0in;margin-left:0in;font-size:12.0pt;font-family:"Times New Roman";} span.EmailStyle19 {font-family:Arial;color:navy;} _filtered {margin:1.0in 1.25in 1.0in 1.25in;} div.Section1 {} --> Ok, I admit I donʼt know a lot about the subject, but isnt the linux clustering system gfs or something like that alsoe usable? And wouldnʼt that be a free filesystem?