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The kfed is an undocumented ASM utility that can be used to read and modify ASM metadata blocks. It is a standalone utility, independent of ASM instance, so it can be used with either mounted or dismo...

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 c...

ASM Allocation Units An ASM allocation unit (AU) is the fundamental space unit within an ASM disk group. Every ASM disk is divided into allocation units. When a disk group is created, the allocation u...

ASM Configuration Assistant (ASMCA) was introduced in ASM version 11.2. It is used to configure ASM instances, and to create and manage disk groups, volumes and ASM cluster file systems (ACFS). ASMCA ...

Starting with version 11.2, ASM runs from the Grid Infrastructure home in both single instance and cluster installs. This is very different to earlier versions so I would encourage you to invest some ...

The SYSASM privilege (introduced in 11.1) is fully separated from the SYSDBA privilege in 11.2. If you choose to use this optional feature, and designate different operating system groups as the OSASM...

The staleness directory (ASM file number 12) contains metadata to map the slots in the staleness registry to particular disks and ASM clients. The staleness registry (ASM file number 254) tracks alloc...

ASM is a critical component of the Exadata software stack. It is also a bit different - compared to non-Exadata environments. It still manages your disk groups, but builds those with grid disks. It st...

This has to be one of the top ASM questions people ask me. But if you expect me to respond with a number of minutes, you will be disappointed. After all, ASM has given you an estimate, and you still w...

Sometimes we want to know where exactly is a particular database block - on which ASM disk, in which allocation unit on that disk and in which block of that allocation unit. In this post I will show h...