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How is the Oracle Cluster Registry (OCR) stored when I use ASM?

April 26, 2017asm cluster OCR Oracle Registry stored

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How is the Oracle Cluster Registry (OCR) stored when I use ASM?

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The OCR is stored similar to how Oracle Database files are stored. The extents are spread across all the disks in the diskgroup and the redundancy (which is at the extent leve) is based on the redundancy of the disk group. You can only have one OCR in a diskgroup. Best Practice for ASM is to have 2 diskgroups. Best Practice for OCR in ASM is to have a copy of the OCR in each diskgroup.