| Specifications | z/OS Best Practices with Virtual Provisioning Tony Negro |
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| Specifications | z/OS Best Practices with Virtual Provisioning Tony Negro |
| Business section |
| Specifications | z/OS Best Practices with Virtual Provisioning Tony Negro |
| Outline | Executive summary Audience Terminology Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Additional cache requirements Thin pool layout considerations Virtual Provisioning: Configuration guidelines Sizing resources for thin devices Adding capacity to a thin pool running out of space Thin pool rebalancing Thin device compression Thick-to-thin migration considerations Local and remote replication and Virtual Provisioning Virtual Provisioning with Mainframe Enablers (MFE) General Pool Maintenance (GPM) usage examples Device mobility with Virtual Provisioning Monitoring the Virtual Provisioning pools Thin pool space reclamation Conclusion References |
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| Content | 7 z/OS and Virtual Provisioning Best Practices As noted, it is possible for a thin device to be presented for host-use before all of the reported capacity of the device has been assigned. It is also possible for the sum of the reported capacities of the thin devices using a given pool to exceed the available storage capacity of the pool. Such a thin device configuration is said to be oversubscribed or over-provisioned. There are options available to the user to control whether or not an over-provisioned thin pool will be allowed. Virtual Provisioning provides these important benefits: 1. The data is effectively wide striped across all the disks in the pool, thereby greatly reducing or eliminating hot spots and improving overall performance of the array. 2. The array is positioned for active performance management at both the sub- volume and sub-dataset level using FAST VP. Performance The performance implications of using Virtual Provisioning depend on the nature of the workload and the state of the thin device. In any thin device implementation, there are response time and throughput overheads that are incurred the first time a write is performed on an unallocated region of a thin device. In the Symmetrix implementation, these overheads are quite modest and, in most cases, are undetectable. The overhead applies primarily to the first write to a thin device extent and disappear altogether once the working set of a thin device has been written to. The most important aspect to understand about thin device performance is how thin devices are spread across the back end. As already discussed, the track groups for thin devices are dispersed (widely striped) across the back end, typically spanning a much greater number of drives than a regular device. Because of this, thin devices make it easier to avoid skews in the back-end workload. The result can be improved performance for most I/O workloads. Virtual Provisioning: Configuration guidelines Creating a Virtual Provisioning environment that results in high performance and availability requires adherence to specific configuration standards. When planning a configuration using thin devices, the first step involves determining how many separate thin pools are needed, and the required composition of each thin pool. Typically, this involves conceptually organizing drive storage into separate classes, with further subdivision, as needed, to allow the back-end resources (drives and DAs) used by the pools to be isolated from one another. Depending on the mix of applications to be placed on thin devices, it is often necessary to create multiple thin pools. However, the most efficient use of resources is achieved by using a minimal number of pools. A thin pool should be designed for use by a given application, or set of related applications, aligned with a given business group. The applications sharing a thin pool compete for back-end resources, including thin pool storage capacity, so applications should not share the same pool if this is not acceptable. The devices comprising a thin pool have the same performance and protection properties, so the |
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