<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hello,<div><br></div><div>Red Hat magazine articles aren't official documentation. Additionally RHM is no longer published (hasn't been for years.) </div><div><br></div><div>The difference between what the article is talking about and what we support in RHEL is a matter of quality assurance and testing - we can only support what we can reasonably test and what we can commit to being able to dedicate to issue reproduction and resolution in the course of a support case. Linux-cluster and GFS/GFS2 will scale well past 16 nodes but Red Hat doesn't test or do engineering and development work on more than 16. </div><div><br></div><div>The other side of the equation is that linux-cluster + GFS2 on RHEL as marketed by Red Hat is a high availability product - not a distributed computing or "big data" product. It's hard to make a case for HA at large scale. For HA purposes 16 nodes is on the generous side - I rarely see clusters greater than 4 nodes in the course of my work with cluster customers. Cluster and GFS2 could be spun into the back-bone for distributed computing or big data deployments but that's not how Red Hat tests, develops, and thus supports the combination of those products. If you are doing a research, academic, community, or personal project and don't require enterprise support you could likely do some really interesting things with GFS2/cluster at large scale - but for supported deployments with a commitment from Red Hat to test, QA, develop, and resolve issues the limit is 16.</div><div><br></div><div>Hope this information helps you.</div><div><br></div><div><div><font class="Apple-style-span" color="#939393">--</font></div><div><font class="Apple-style-span" color="#939393">Adam Drew</font></div><div><font class="Apple-style-span" color="#939393">Software Maintenance Engineer</font></div><div><font class="Apple-style-span" color="#939393">Support Engineering Group</font></div><div><font class="Apple-style-span" color="#939393">Red Hat, Inc.</font></div><div><font class="Apple-style-span" color="#939393"><br></font></div></div><div><div><div>On Jan 5, 2012, at 12:07 PM, Dax Kelson wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Looking in older Red Hat Magazine article by Matthew O'Keefe such as:<br><br><a href="http://www.redhat.com/magazine/008jun05/features/gfs/">http://www.redhat.com/magazine/008jun05/features/gfs/</a><br><a href="http://www.redhat.com/magazine/008jun05/features/gfs_nfs/">http://www.redhat.com/magazine/008jun05/features/gfs_nfs/</a><br> <br>There are references to large GFS clusters.<br><br>"For example, if 128 GFS server nodes require..." and "scalability 300+ or more"<br><br>Why is it on RHEL6 only a max of 16 nodes is supported?<br> <br>Thanks,<br>Dax Kelson<br>Guru Labs<br> --<br>Linux-cluster mailing list<br><a href="mailto:Linux-cluster@redhat.com">Linux-cluster@redhat.com</a><br>https://www.redhat.com/mailman/listinfo/linux-cluster</blockquote></div><br><div apple-content-edited="true"> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><font class="Apple-style-span" color="#939393"><br class="Apple-interchange-newline"><br></font></div><div style="color: rgb(0, 0, 0); "><br></div></div></span><br class="Apple-interchange-newline"></div></span><br class="Apple-interchange-newline"></span><br class="Apple-interchange-newline"> </div> <br></div></body></html>