You plan to monitor the ASM configuration on an X5 Database Machine as part of your role supporting Exadata-based ASM diskgroups. You want to check for potential space problems that take ASM mirroring requirements into account. Which two values would you monitor from V$ASM_DISKGROUP or by using the ASMCMD LSDG command? 

Answer options:

A. cold_used_mb
B. total_mb
C. required_mirror_free_mb
D. free_mb
E. usable_file_mb

BD

Determine the Amount of Available Space To increase the size of the disks in a disk group you must either have unallocated disk space available, or you have to reallocate space currently used by a different disk group. Example: View the space currently used by the disk groups. SELECT name, total_mb, free_mb, total_mb - free_mb used_mb, round(100*free_mb/total_mb,2) pct_free FROM v$asm_diskgroup - ORDER BY 1; 

The example above shows that the DATAC1 disk group has only about 15% of free space available while the RECOC1 disk group has about 87% free disk space. The PCT_FREE displayed here is raw free space, not usable free space. Additional space is needed for rebalancing operations. References: http://docs.oracle.com/cd/E80920_01/SAGUG/exadata-administering-asm.htm#SAGUG20526