Is this normal in "normal redundancy?

The GI version: 11.2.0.4 (RAC 3-node)

OS: Oracle Linux 6.4

Storage EMC Symmetrix VMAX

I created a diskgroup with normal redundancy as shown below.

10 each = 5000GB 500 GB LUN

CREATE DISKGROUP DATA_DG1

NORMAL REDUNDANCY

DISC

"ORCL:DATA_D1,"

"ORCL:DATA_D2,"

"ORCL:DATA_D3,"

"ORCL:DATA_D4,"

"ORCL:DATA_D5,"

"ORCL:DATA_D6,"

"ORCL:DATA_D7,"

"ORCL:DATA_D8,"

"ORCL:DATA_D9,"

'ORCL:DATA_D10 '.

ATTRIBUTE 'au_size' = "4 M";

DiskGroup created.

Given that it was normal, I was expecting half of gross space 5000 GB = 2.5 terabytes of usable space. But, the query below shows the output, I myself only 2.19 terabytes of usable (2249,86 GB) space. About 250GB short of what I expected. So where's my advantage 250 GB?

SQL > select name, TYPE, 1024/1024/TOTAL_MB, FREE_MB/1024/1024, USABLE_FILE_MB/1024/1024 of v$ asm_diskgroup where name = 'DATA_DG1 ';

NAME TYPE TOTAL_MB/1024/1024 FREE_MB/1024/1024 USABLE_FILE_MB/1024/1024

------------------------------ ------ ------------------ ----------------- ------------------------

NORMAL DATA_DG1 4.8828125 4.8825531 2.19713593

The amount of usable file space is equal to the amount of free disk space subtracted from the amount of disk space required to restore redundancy after failure divided by the level of redundancy of the disk group that is in your case.

Run:

select trunc((free_mb - required_mirror_free_mb) / 2) as useable from v$asm_diskgroup where name='DATA_DG1';

Source: http://prutser.wordpress.com/2013/01/03/demystifying-asm-required_mirror_free_mb-and-usable_file_mb/

Tags: Database

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