Storage Policy Based Management (SPBM) is a major element of your software-defined storage environment. It is a storage policy framework that provides a single unified control panel across a broad range of data services and storage solutions.
We all know traditional storage solutions normally use a LUN or a volume which is created from a RAID to provide a specific level of performance and availability. The challenge with this model is each LUN or volume is limited to providing one level of service regardless of the workloads that it contains. Due this we have to create multiple LUNs or volumes to provide the required storage services for different workloads. Also it is very difficult to maintain many LUNs or volumes .Also it is a manual process to manage Workloads and storage deployment in traditional storage environments , it is time consuming and high possibilities to occur human error.
By using Storage Policy-Based Management (SPBM) we achieve accurate control of storage services. Like other storage solutions, vSAN provides services such as availability levels, capacity consumption, and stripe widths for performance. A storage policy contains one or more rules that define service levels.
As an abstraction layer, SPBM abstracts storage services delivered by Virtual Volumes, vSAN, I/O filters, or other storage entities.Multiple partners and vendors can provide Virtual Volumes, vSAN, or I/O filters support. Rather than integrating with each individual vendor or type of storage and data service, SPBM provides a universal framework for many types of storage entities.
SPBM offers the following mechanisms:
Advertisement of storage capabilities and data services that storage arrays and other entities, such as I/O filters, offer.
Bidirectional communications between ESXi and vCenter Server on one side, and storage arrays and entities on the other.
Virtual machine provisioning based on VM storage policies.
We have to use vSphere Web Client for creating and managing storage policies . Policies can be assigned to virtual machines and individual objects such as a virtual disk. Storage policies are easily changed or reassigned if application requirements change. These modifications are performed without downtime and the need to migrate virtual machines from one datastore to another. SPBM makes it possible to assign and modify service levels with precision on a per-virtual machine basis.
To be deployed in the vSAN cluster, the VM must be bound to a VM Storage Policy. This policy enables to configure per VM the following settings:
Note:Best practice is FTT may be set higher than 1 for higher levels of redundancy in the system and for surviving multiple host failures. Higher FTT impacts performance because multiple copies of data must be ensured on write operations.
Note :- Deduplication is available only for All Flash Configuration
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