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ASM ensures that file extents are evenly distributed across all disks in a disk group. This is true for the initial file creation and for file resize operations. That means we should always have abala...

Some ASM commands have the "force" option that allows the administrator to override a default behaviour. While some uses of the force option are perfectly safe and indeed required, some may render you...

The ASM Metadata Dump Utility - better knows as amdu- is used by Oracle Support and Oracle Development to diagnose and sometimes resolve ASM issues. It can be used to print ASM metadata and extract bo...

When an ASM disk becomes unavailable, ASM drops it from the disk group, right? Well, that depends on the ASM version and on the disk group redundancy. An external redundancy disk group would be simply...

ASM disk header is probably the best known piece of ASM metadata. Chances are you learned about it when it was damaged or lost and hopefully Oracle Support was able to get you up and running. In this ...

Here are the ASM tools I recommend you get familiar with. asmcmd - command line interface to ASM When ASM was released the asmcmd was useless. Today, in version 11gR2, the asmcmd is a truly versatile ...

When ASM creates a file, e.g. on a request from an RDBMS instance, it allocates space in extents. Once the file is created, ASM passes the extent map to the RDBMS instance that can then access the fil...

ASM provides data redundancy by placing mirrored extent copies on partner disks in different failgroups. Each ASM disk, in a redundant disk group of course, would have up to 8 partner disks (up to 10 ...

When using ASMLIB to manage ASM disks, the device path info is not displayed in gv$asm_disk.path. If you are using ASMLIB Support Tools 2.1. and later (package oracleasm-support-2.1*) you can get that...

An ASM instance manages metadata needed to make ASM files available to Oracle databases and ASM clients. ASM metadata is stored in disk groups – in metadata blocks. Some ASM metadata is at the fixed p...