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#Datastore usage on disk alarm in vsphere 6 free#
Storage DRS can also provide remediation when the free space in the backing pool is running out by moving VMs away from datastores sharing the same common backing pool.ģ. Knowing the available capacity allows Storage DRS to make recommendations based on the actual available space in the shared backing pool rather than the reported capacity of the datastore (which may be larger). This allows Storage DRS to avoid migrating VMs between two thin provisioned datastores that share the same backing pool. Report the available capacity in the common backing pool.Discover the common backing pool being shared by multiple datastores.In Storage DRS in vSphere 6.0, using VASA 2.0, the following changes were made to thin provisioned datastores interop: However this did not address the situation where multiple datastores could be backed by the same pool of storage capacity on the array. This causes Storage DRS to mark the datastore and prevent any virtual disk deployment or migration to that datastore to avoid running out of capacity. If the datastore exceeds the thin-provisioning threshold of 75 percent, VASA raises the thin-provisioning alarm. In previous versions of vSphere, Storage DRS leveraged the VMware vSphere APIs – Storage Awareness (VASA) thin-provisioning threshold. However this logical LUN size could be much larger than the actual available capacity of the backing pool of storage on the storage array. Storage DRS by itself does not detect whether the LUN is thin or thick provisioned it detects only the logical size of the LUN. Let’s look once more at what the white paper says about thin provisioned datastores. Thin Provisioned Datastore Interoperability However it does allow Storage DRS to manage logical space while keeping virtual disks in the same dedupe pool.Ģ. These enhancements enable Storage DRS to avoid moving VMs between datastores that are not in the same deduplication pool.
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In Storage DRS in vSphere 6.0, VASA 2.0 now exposes if a datastore is being deduplicated and identify whether one or more datastores share common backing pools for deduplication. How does Storage DRS do placement on this datastore? The main issue for Storage DRS is that a datastore appears to store more data than it has capacity for. If Storage DRS moves a virtual disk from datastore A to datastore B, and the datastores share a common backing pool for deduplication, it may simply inflate the virtual disk contents at datastore A and then re-index it again at datastore B without any real impact for the actual space usage. There is always a chance that this is not the case, and this might be a reason not to apply a recommendation to migrate a virtual machine with a large virtual disk. It states that you must determine whether the deduplication process will be as efficient-that is, able to deduplicate the same amount of data-after the migration as it was before the migration. In the white paper mentioned above, one of the items it discusses is using Storage DRS in conjunction with deduplication. As you will see, a great any of these have now been addressed, along with some pretty interesting feature enhancements. Although a number of years old, it highlights many of the Storage DRS interoperability concerns. There is a white paper which discusses many of the previous limitations of Storage DRS interoperability and I’d recommend reviewing it. This article will discuss the changes and enhancements that we have made. We made a number of enhancements to Storage DRS in vSphere 6.0.