Bug 9572787 Long waits for ‘enq: AM – disk offline’ following cell or disk crash (can cause further instance crashes)

If anyone is implementing Oracle 11g R2 (11.2.0.2) with extended cluster might get affected by this bugs.

In my case, this bug comes out when we tested to offline the whole second Disk array on the Failgroup 2 which we using ASM normal redundancy.

Until now we still waiting for the merge patch for this issue. Hope they will release the patch soon. For more details about this bugs please check on Oracle support portal.

Update 8 July 2011:
Oracle released the merge patch. The test result is much better, the instances was still rebooted. Only until we set the hidden parameter ,recommend by Oracle support then the instances survived. The parameter is

_lm_rcvr_hang_kill=FALSE

 Do not use this parameter unless Oracle support told us to do so.