Hi Daniel, it can be a quite complex setup. please check: as which user is your ASM instance running? at which user is your DB running? what are the Groups those 2 belong to? what's the owner/group of the raw devices? what's the user/group of the oracle binaries involved? all of those can affect the symptoms and there are a LOT of combinations which can create your suggested incident pattern. (I'm working with linux-only setup at the moment, but I hope posix group & permissions are similar on AIX) Martin On Wed, Mar 19, 2014 at 2:03 PM, Hubler, Daniel <daniel.hubler@xxxxxxxxxx>wrote: > Oracle DBMS v11.2.0.3 > > 2-node RAC > > ASM on raw devices > > AIX v6.1 > > (a TEST environment !) > > > > > > > > Added a bunch of raw devices into ASM using the following: > > === > > SQL> alter diskgroup data > > add disk > '/dev/rhdisk35','/dev/rhdisk36','/dev/rhdisk37','/dev/rhdisk38','/dev/rhdisk39','/dev/rhdisk40','/dev/rhdisk41' > > rebalance power 8; > > > > Diskgroup altered. > > === > > > > Shortly (minutes) after this completed, > > both database instances crashed. > > ASM survived. > > > > Immediately started looking at the details on these raw devices. > > Discovered that the permissions on some of them were incorrect; missing > various r-w permissions. > > > > Changed those permissions. > > Restarted the DBMS instances successfully; no issues since. > > > > I guess my question is, how did this get past ASM ? > > Does it not check for this? > > > > (the coincidence is that the AIX-admin who built the raw devices was doing > this for the first time) > > > > Thanks for any input. >