Thanks Gene. I understand it's possible to import the group manually, but the discussion here was around how VCS would behave normally, without manual intervention. Wouldn't a vxdg -C to clear the private region give the server with the group already imported heartburn? Would it allow both servers simultaneous access to the storage?
BTW, We are using two private interconnects as well as a link-lowpri already. From: Gene Henriksen [mailto:gene_henrik...@symantec.com] Sent: Wednesday, October 13, 2010 11:34 AM To: Everett Henson; 'veritas-ha@mailman.eng.auburn.edu' Subject: RE: I/O Fencing non-CFS IO Fencing works with VCS. Even without CFS/RAC it is the best protection against split-brain. You CAN import a DG on multiple systems by using vxdg -C import <dg> to clear the name in the private region. Alternatives include the preonline_ipc trigger (in sample_triggers, copy to triggers, rename preonline and enable PreOnline in service groups). Also link-lowpri. ________________________________ From: veritas-ha-boun...@mailman.eng.auburn.edu [mailto:veritas-ha-boun...@mailman.eng.auburn.edu] On Behalf Of Everett Henson Sent: Wednesday, October 13, 2010 11:04 AM To: 'veritas-ha@mailman.eng.auburn.edu' Subject: [Veritas-ha] I/O Fencing non-CFS Group, There has been a discussion in my workplace over the usefulness of I/O Fencing in the absence of CFS or Oracle RAC. The question is whether I/O Fencing is necessary when Standard Storage Foundation is being used. My understanding is that without CFS or RAC, only one node can have a Disk Group imported at a time, and even in the event of split brain, no two servers can have the same access to the same storage simultaneously. Any attempt by one server to import storage already imported on another server should result in a FAULT or an error. In all the documentation on Veritas I've read over the years, I/O Fencing is only mentioned in connection with shared storage, and never with standard SF. So, what is the consensus, does implementing I/O Fencing with Standard SF provide any advantage? Everett Henson ________________________________ Please consider the environment before printing this email. Visit our website at http://www.nyse.com ***************************************************************************** Note: The information contained in this message and any attachment to it is privileged, confidential and protected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender immediately by replying to the message, and please delete it from your system. Thank you. NYSE Euronext. </pre> <P><hr size=1></P> <P><STRONG><font color=green>Please consider the environment before printing this email.</font></STRONG></P> <P><STRONG>Visit our website at <a href="http://www.nyse.com";>http://www.nyse.com</a> <br> ***************************************************************************** <br> Note: The information contained in this message and any attachment to it is privileged, confidential and protected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender immediately by replying to the message, and please delete it from your system. Thank you. NYSE Euronext. </STRONG></P><pre>
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