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Brief Notes on Automatic storage Management

Oracle ASM uses disk groups to store data files. An ASM disk group is a collection of disks managed as a unit. Within a disk group, ASM exposes a file system interface for Oracle database files. The content of files that are stored in a disk group is evenly distributed to eliminate hot spots and […]

December 1st, 2012 | Tags: | Category: Automatic Storage Management | 2 comments - (Comments are closed)

Oracle ASM Metadata Disk Utility (AMDU): View the metadata/content of asm diskgroups without mounting them

Hi,

When the ASM Diskgroups are mounted and the ASM instance is up and running you can view various dynamic views such as v$asm_diskgroup, v$asm_disk, v$asm_template etc to view the disk properties.

But, When the diskgroup is not mounted, this information is not available, which makes difficult to diagnose the errors avoiding the diskgroup to […]

November 30th, 2012 | Category: Automatic Storage Management | Comments are closed

ASM: Fine grained striping vs. Coarse

Hello,

We all aware that Oracle Automatic storage management offers striping of disks but propreitory of its own method.

To stripe data, Oracle ASM separates files into stripes and spreads data evenly across all of the disks in a disk group. It has two methods of striping, Fine & Coarse.

Fine Striping:- Fine striping writes […]

November 30th, 2012 | Tags: | Category: Automatic Storage Management | Comments are closed

ORA-15036: disk ‘string’ is truncated, ASM disks group DATA is not mounting

Hello,

Another issue came up today!!!

Issue:- ORA-15036: disk ‘string’ is truncated The size of the disk, as reported by the operating system, was smaller than the size of the disk as recorded in the disk header block on the disk.

Apparently the concerned disk group is not mounting, unfortunately this contains our OCR Disks […]

September 25th, 2012 | Tags: , , | Category: Automatic Storage Management | 6 comments - (Comments are closed)
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