Oracle Acfs Space Management; Oracle Asm Calculations; Definition Of Terminology - Oracle X6-2-HA Deployment And User's Manual

Table C-3

Oracle ASM Calculations

Number of Redundancy
Drives
2 NORMAL
4 NORMAL
Note:
Note: 1TB = MB divided by 1024
The following table describes how capacity terms are defined by Oracle ASM and
Oracle Database Appliance.
Table C-4

Definition of Terminology

Term
Total_MB
Free_MB
Req_mir_free_MB
Usable_file_MB

Oracle ACFS Space Management

The Oracle ACFS file systems are automatically created when you create a database
on Oracle Database Appliance.
When you use Oracle ACFS for database storage, the following is created:
• A 100G ACFS is created from +DATA diskgroup for each database. This Oracle
ACFS automatically extends the space on demand.
• A common Oracle ACFS with 25% of +RECO diskgroup is created with auto
extension on. This file system is used for fast recovery area and redo logs for all
databases.
Total_MB Free_MB
4894016 4893372
1231176 1230996
Oracle ASM Definition
Size of the disk group in MB
Free space in the disk group in MB,
without regard to redundancy.
Amount of space that must be
available in the disk group to restore
full redundancy after the worst failure
that can be tolerated by the disk
group.
Amount of free space, adjusted for
mirroring, that is available for new
files.
Oracle ACFS Space Management
Req_mir_free Usable_file_
_MB MB
2441888 1220644
610468 305150
2
Oracle Database Appliance
Definition
Total usable storage. For example,
for 2 NVMe drives, total usable
storage is 5.8TB.
Total usable storage after formatting
to Oracle ASM disk groups. For
example, for 2 NVMe drives, total
usable storage is 5.8TB.
Usable space required to restore full
redundancy. When storage is
consumed higher than the
usable_file_MB
will report a negative value.
Total usable space taking into
consideration the mirroring level.
Oracle ASM also calculates the
amount of space required
Appendix C
Name
DATA/
RECO/
value, this number
C-6