Even on smaller infrastructures, it performs much better for clustered operations and especially for SDRS and VM operations. With much faster SDRS recommendation times, VMware is encouraging their customers to migrate to vSphere 6.7. Disable Intra-VM affinity: To maximize SDRS performance, you can override the default intra-VM affinity rule at the VM level or at the cluster level. Datastore usage on disk alarm in vsphere 6.5 free#SDRS will perform better when more than two datastores are in the SDRS cluster because it will be able to balance the loads and distribute the free space better. Optimize performance: While the minimum for an SDRS cluster is two datastores, it is not an optimal configuration for the system.Don't exceed the limits: You should not exceed 64 datastores per datastore cluster and 256 datastore clusters per vCenter.Pick datastores that are as homogeneous as possible in terms of host interface protocol (i.e., FCP, iSCSI, or NFS), RAID level, and performance characteristics. Don't mix disks: They recommend not mixing SSDs and hard disks in the same datastore cluster.Let's look at some recommendation from VMware concerning SDRS. The concurrent VM operations show an improvement of between 20x and 30x in vSphere 6.7 compared to vSphere 6.5. It came out with some great results showing, for example, a datastore enter maintenance improvement of almost 14x in vSphere 6.7 compared to vSphere 6.5. VMware published a whitepaper where they conducted different tests for SDRS on the vSphere 6.7 platform. The time to issue those recommendations is now much shorter even for standalone provisioning requests without (or with) reservations. In this use case, users and admins will see a great improvement in provisioning times for situations when there are no reservations.Īlso, VMware improved the inside DRS steps that happen before issuing recommendations. Other VMware products for automation and management, such as vRealize Automation, use blueprints to deploy a large number of VMs automatically. When creating several provisioning requests in parallel, and there are no storage reservations for VMDKs, the improvements in execution speed are quite substantial. So this is why VMware made many changes in vSphere 6.7 to improve the time to generate placement recommendations for provisioning operations. VMware has greatly improved this latency in vSphere 6.7.Īdditionally, this latency is even more "visible" when issuing multiple VM provisioning requests in parallel. It takes significant time to calculate the placement recommendations for VM disks. In fact, most improvements are in this area. VMware has put a lot of effort into this between vSphere 6.5 and 6.7. While it's not possible to increase transfer speed between datastores where you'll hit the limit of your underlying hardware (such as network and storage system), it is certainly possible to speed up the decision-making process. Now that we know what SDRS is about, let's talk about some of the enhancements and improvements added in vSphere 6.7. VMware SDRS advanced options VMware SDRS enhancements in vSphere 6.7 ^ From the vSphere Client, select Storage > Your datastore cluster > Edit Settings. Let's look at an overview of the SDRS configuration at the cluster level. Inter-/intra-VM affinity rules: It is possible to create affinity or anti-affinity rules between VMs or VMDKs and keep disks together (separate) on datastores.SDRS will do a storage vMotion for all the VM files (all VMDKs stored in the datastore). Datastore maintenance mode: This helps you when performing hardware maintenance.The default space threshold per datastore is 80%, whereas the default I/O latency threshold is 15 ms. I/O and space are the two metrics it uses, and they have certain (modifiable) default thresholds. It dynamically balances the SDRS cluster imbalance. Load balancing based on space and I/O: As stated, SRDS uses I/O as a metric.Initial placement: Ensures disk placement when initiating certain VM operations (create VM, add disk, clone, or relocate).Resource aggregation: Allows you to group multiple datastores into a single pool of storage, which then becomes a datastore cluster.These five core features are the main operations SDRS performs: Let's look at the five different core storage features of VMware SDRS. SDRS uses a storage I/O control to retrieve the I/O metrics required to create load-balancing recommendations. While it supports both NFS and VMFS, you can't add NFS storage to your VMFS-based SDRS cluster.
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