Storage DRS has been previewed at VMworld and other events since around 2009, and it will finally be public in VMware vSphere 5. Storage DRS extends the Distributed Resource Scheduler (DRS) to the storage stack and provides three main categories of functionality with vSphere 5:
- Initial placement of virtual machines and their associated disks (VMDK files) based on space availability and I/O capacity.
- Load management among datastores in a datastore cluster leveraging Storage vMotion based on space availability.
- Load management with Storage vMotion based on datastore latency (in milliseconds checked every 8 hours by default).
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With this configuration, virtual machines can undergo a Storage vMotion task to a datastore that performs better in terms of latency. Further, this can be automated with this configuration. A good design point for this configuration is that we would put datastores of the same storage tier in this datastore cluster. Specifically, we don't want to mix SSD datastores with SATA datastores or even the same drive types of different speeds.
Does Storage DRS interest you? How would you utilize it with a datastore cluster? Let us know in the discussion.Also read: vSphere 5 introduces VMFS 5
Rick Vanover is a software strategy specialist for Veeam Software, based in Columbus, Ohio. Rick has years of IT experience and focuses on virtualization, Windows-based server administration, and system hardware.