Clusterware failure will happen _only_ when it can not acess the physical devices (disk timeout in css) and shutting down ASM does not revoke the access to disks. In your case clusterware _knows_ the location of ocr/voting information in ASM disks and it can continue reading/writing even ASM instance is down. -Gopal On Thu, Jan 21, 2010 at 2:51 AM, LS Cheng <exriscer@xxxxxxxxx> wrote: > Hi > > I was doing some cluster destructive tests on RAC 11gR2 a few days ago. > > One of tests was kill ASM and see how does that affects Clusterware > operation since OCR and Voting Disks are located in ASM (OCRDATA Disk > Group). After killing ASM nothing happened as it was quicky started up > again. So far so good. The next test was same test but changing the ASM > Disks ownership so when ASM is restarted OCR Disk Group cannot be accessed. > Surprisingly ASM Was started up, Database Disk Group was mounted OCR disk > Group obviously did not get mounted but then the Cluster was working without > any problems. > > So how is this happening? Doesnt Clusterware need to write and read to > Voting Disk every second? I was expecting a Clusterware failure in the node > but everything worked just as everything were ok. > > Thanks! > > -- > LSC > > -- //www.freelists.org/webpage/oracle-l