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Oracle RAC on RedHat Linux Best Practice guide and ... - OpenMPE

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ASM – disk groups <strong>and</strong> failure<br />

groups<br />

• A disk group can include any number of disk devices<br />

• Each disk device can be :<br />

− an individual physical disk,<br />

− a multiple disk device such as a RAID storage array or logical<br />

volume<br />

− a partiti<strong>on</strong> <strong>on</strong> a physical disk.<br />

• However, in most cases, disk groups c<strong>on</strong>sist of <strong>on</strong>e or<br />

more individual physical disks.<br />

• To enable ASM to balance I/O <strong>and</strong> storage appropriately<br />

within the disk group, all devices in the disk group should<br />

have similar, storage capacity <strong>and</strong> performance.<br />

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