CHAPTER 4Diskgroups and Failure Groups

The primary component of ASM is the diskgroup, which is the highest-level data structure in ASM (see Figure 4-1). A diskgroup is essentially a container that holds a logical grouping of disks that are managed together as a unit. The diskgroup is comparable to a logical volume manager's (LVM) volume group. Once ASM has discovered the disks, these disks can be used to create a diskgroup.

ASM diskgroups differ from typical LVM volume groups in the following ways:

Image An ASM filesystem layer is implicitly created within a diskgroup.

ASM diskgroups have inherent automatic file-level striping and mirroring capabilities. ...

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