Hi Folks, I have a 10.2.0.2 ASM instance running on Solaris 9 with the following scenario: 1. All raw disk slices are 5GB in size 2. I have created a normal redundancy ASM diskgroup with two failure groups as shown below: SQL> create diskgroup data normal redundancy failgroup failgroup_1 disk '/dev/vx/rdsk/ux016_RAW/volraw_01' failgroup failgroup_2 disk '/dev/vx/rdsk/ux016_RAW/volraw_02' / When I run the sql statement, as shown below, I see the following output: SQL> select GROUP_NUMBER GROUP#, NAME, STATE, TOTAL_MB, FREE_MB, REQUIRED_MIRROR_FREE_MB REQ_MIRR_FREE_MB, USABLE_FILE_MB from V$ASM_DISKGROUP; GROUP# NAME STATE TOTAL_MB FREE_MB REQ_MIRR_FREE_MB USABLE_FILE_MB ---------- -------------- --------------- ---------- ---------- ---------------- -------------- 1 DATA MOUNTED 10240 10138 0 5069 So, the total size of the DG is 10GB with Usable space of 5GB. Because the group is mirrored 1:1, the REQ_MIRR_FREE_MB is zero. 3. When I create the same group with two disks in each failover group, I see an output that I am not able to comprehend: SQL> create diskgroup data failgroup failgroup_1 disk '/dev/vx/rdsk/ux016_RAW/volraw_01', '/dev/vx/rdsk/ux016_RAW/volraw_02' failgroup failgroup_2 disk '/dev/vx/rdsk/ux016_RAW/volraw_03', '/dev/vx/rdsk/ux016_RAW/volraw_04' / SQL> select GROUP_NUMBER GROUP#, NAME, STATE, TOTAL_MB, FREE_MB, REQUIRED_MIRROR_FREE_MB REQ_MIRR_FREE_MB, USABLE_FILE_MB from V$ASM_DISKGROUP; GROUP# NAME STATE TOTAL_MB FREE_MB REQ_MIRR_FREE_MB USABLE_FILE_MB ---------- -------------- --------------- ---------- ---------- ---------------- -------------- 1 DATA MOUNTED 20480 20374 5120 7627 I was hoping to see REQ_MIRR_FREE_MB of zero because I have a DG that contains two failure groups with each group contains two disks. I was also expecting to see 10GB for the USABLE_FILE_MB. Can someone please clarify how two interpret these stats. Thanks Amir -- //www.freelists.org/webpage/oracle-l