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Creating File Devices On NAS/NFS FileSystems For ASM Diskgroups. (Doc ID 1620238.1)

Last updated on MAY 22, 2023

Applies to:

Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.


The present document provides the step (in detail) to create ASM diskgroups on NAS/NFS file devices.


Note: Caution should be exercised when considering using NFS storage, in an Oracle database environment, with ASM. In general, such configurations should be avoided or at least carefully considered. The issue is that to prevent data corruption, NFS file systems must be hard-mounted. Hard mounting means that the database or an ASM instance must wait indefinitely when an NFS server, or the communications link it operates over, becomes unavailable. This means that ASM cannot effectively provide data mirroring.

Situations where NFS on ASM may be a reasonable option include:
  • Using NFS for an ASM Quorum Failure Group, as is often done with Extended Clusters. NFS on Quorum Failure Groups with or later, does not need, or should not use hard NFS mounts.
  • Situations where reliable access to NFS service can be assured.
  • When using NFS storage only for an External Redundancy Diskgroup.
  • Situations where the lost of ASM file access for an extended period is not critical.



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