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FREE_MB From V$ASM_DISKGROUP/V$ASM_DISK And V$ASM_ACFSVOLUMES/V$ASM_FILESYSTEM, Do Not Match (Doc ID 1496935.1)

Last updated on SEPTEMBER 16, 2021

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.1 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

FREE_MB between view v$asm_diskgroup or v$asm_disk AND v$asm_acfsvolumes or v$asm_filesystem, do not match.

Example:

* v$asm_diskgroup:                                  FREE_MB=3800             <-- TEMP_SUMP_ZONE disk group
* v$asm_disk:                                          FREE_MB=3800             <-- TEMP_DUMP_ZONE_0000 (/dev/rdsk/c0d5s6) disk
* v$asm_acfsvolumes/v$asm_filesystem:    FREE_MB=290795.086    <-- fs_name=/temp_dump_zone (vol_device=/dev/asm/voltemp-96)


The concern is that backups may fail because ASM may detect there is not sufficient space.

According to the documentation, free_mb from these v$asm* views report the same value:

 
 

Cause

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In this Document
Symptoms
Cause
Solution


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