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Dell PowerFlex Deployment Best Practices for Oracle RAC 21c
Executive summary PowerFlex product overview Solution architecture
Overview
PowerFlex features
PowerFlex network configuration
PowerFlex cluster and storage configuration
Logical architecture
Oracle 21c RAC on PowerFlex design considerations Performance tests Best practices Conclusion References Hardware and software details

PowerFlex features

PowerFlex features

  • The PowerFlex storage layout includes the following components:

    Protection Domain

    A Protection Domain (PD) is a group of nodes or SDSs that provide data isolation, security, and performance benefits. A node can only participate in one PD. Separate PDs can be created for different node types with unequal performance profiles.

    Storage Pools

    The Storage Pools are a subset of physical storage devices within a PD. Each storage device belongs to a Storage Pool. Dell Technologies recommends having the same type of storage devices within a Storage Pool to ensure that the volumes are distributed across the same type of storage within the PD.

    Fault Set

    A Fault Set is a logical entity that contains a group of SDSs within a PD that have a higher chance of failing together. By grouping the SDSs into a Fault Set, PowerFlex mirrors the data for a Fault Set on separate SDSs that are outside the Fault Set. In this way, availability is assured even if all the servers within one Fault Set fail simultaneously.

    Medium Granularity Pool

    In a Medium Granularity (MG) Pool, the volumes are divided into 1 MB allocation units, which are distributed and replicated across all disks which are contributing to the pool.

    Fine Granularity Pool

    In a Fine Granularity (FG) Pool, the volumes are divided into 4 KB allocation units. The FG layout requires both Flash media (SSD or NVMe) and NVDIMM to create an FG pool. FG layout is thin-provisioned and zero-padded natively, and enables support for inline compression, more efficient snapshots, and persistent checksums.

    This solution uses an MG layout storage pool.