Anyone seen this before, and have any idea what causes it? It gave us a little heartache Tuesday night. We managed to recover it using a backup ocr, but this is the 3rd time this has happened. Nothing but Oracle running, and noone tried to fdisk a drive. We have opened an SR, but its not moving very fast: WARNNING: cache read a corrupted block group=CRS fn=1 blk=3 from disk 1 NOTE: a corrupted block from group CRS was dumped to /u01/app/oracle/11.2.0/base/diag/asm/+asm/+ASM1/trace/+ASM1_smon_24085.trc WARNNING: cache read(retry) a corrupted block group=CRS fn=1 blk=3 from disk 1 ERROR: cache failed to read group=CRS fn=1 blk=3 from disk(s): 1 CRS_0001 ORA-15196: invalid ASM block header [kfc.c:23908] [endian_kfbh] [1] [3] [67 != 1] ORA-15196: invalid ASM block header [kfc.c:23908] [endian_kfbh] [1] [3] [67 != 1] -- Andrew W. Kerber 'If at first you dont succeed, dont take up skydiving.'