Difference between free space on disk and column FREE_MB in V$ASM_DISKGROUP

Hi ,
in our RAC environment we have setup an ACFS. We use that mainly for RMAN backups. When connecting to the ASM instance and executing the query
Select name, state, total_mb, free_mb from v$asm_diskgroup;
we are getting the following result:
NAME STATE TOTAL_MB FREE_MB
DG00_CRS MOUNTED 10738 9912
DG01_FR MOUNTED 409592 360173
DG02_DATA MOUNTED 6553568 1628732
DG03_BACKUP MOUNTED 5615920 4227
Seems to me that the ASM instance believes that the amount of frees space in diskgroup DG03_BACKUP is 4227 MB. Butr when checking on
operatingsystem level, the result looks different:
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/asm/v03_backup-33
5746196480 2430545120 3315651360 43% /u01/app/oracle/orabackup
=> As a matter of fact, we have about 3,3 TB free space available. Should that result not be shown when running the query above? I currently
don't have a clue why the query returns 4227 MB...
Any help will be appreciated...
Rgds
JH

ACFS is a 11.2 feature, while ASM existed long before
ASM will consider such volumes as used space when querying V$ASM_DISKGROUP, or issuing lsdg in asmcmd
you can use the views V$ASM_ACFSVOLUMES and V$ASM_FILESYSTEM for ACFS
or volinfo in asmcmd

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