Hi, You would need 3 independent sites / datarooms to spread your voting disks. The third voting disk can be placed on a standard nfs volume, but if this nfs server is located in one of the datarooms where the rac nodes are, then you would still not be protected against a general power failure in that dataroom. Apart from that, my experience with extended rac clusters is that they make it more important to functionally partition the applications running on it to avoid a potential bottleneck on the interconnect. When using ASM, you can specify in 11g for each rac node the preferred san to read from. Regards, Freek D'Hooge Uptime Oracle Database Administrator email: freek.dhooge@xxxxxxxxx tel +32(0)3 451 23 82 http://www.uptime.be disclaimer: www.uptime.be/disclaimer --- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Avadhani mys Sent: donderdag 5 augustus 2010 12:05 To: oracle-l; oaugnetdba-on@xxxxxxxx Subject: Extended RAC:11G R2 Hello Gurus, Has anyone implemented extended RAC, please let me know the pro's and con's and any useful links would be really helpful.We are in the process of finalizing proposal to implement extended RAC. Thanks in Advance --Avadhani -- //www.freelists.org/webpage/oracle-l