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Cache – The Datrium DVX Worst Case is Someone Else’s Best Case

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A couple of times I have been asked about caching performance with Datrium DVX. It’s intuitive for people without an understanding of the technology to think that DVX performance is contingent entirely on the host cache and if nodes go down the caches would have to be rewarmed, or a full cache integrity checks would be necessary, like in ZFS with L2ARC. In the L2ARC case, performance could drag for hours until the cache is repopulated.

That is not the case with DVX…

In DVX, we hold data in-use on flash on the host. Moreover, we guide customers to size host flash to hold all data for the VMDKs. With always-on dedupe/compression for host flash as well, this is feasible – with just 2TB flash on each host and 3X-5X data reduction you can have 6-10TB of effective flash capacity. (DVX supports up to 16TB of raw flash on each host). Experience proves this is in fact what our customers do: by and large, our customers configure sufficient flash on the host and get close to 100% hit rate on the host flash.

With any array, you have to traverse the network. However, with any modern SSD, the network latency can be an order of magnitude higher than the device access latency. Flash does belong in the host, especially if you are talking about NVMe drives with sub-50usec latency.

Read the entire article here, Cache – The Datrium DVX Worst Case is Someone Else’s Best Case – myvirtualcloud.net

via Andre Leibovici at myvirtualcloud.net

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MyVirtualCloud.NET by Andre Leibovici Andre Leibovici is a leading expert in the area of Datacenter and Enterprise Mobility. For the last 15 years Andre's passion and dedication has helped many organizations while working for VMware CTO Office, VMware PSO, EMC vSpecialists, and through creating professional blogging resources. His expertise is backed by 20+ years' industry experience managing IT infrastructures and teams for large organizations. Andre's blog myvirtualcloud.net is recognized as one of the industry leading End User Computing blogs with 3M+ hits every month. Based on his field experience, Andre developed a number of free tools to help beginners and advanced architects to appropriately size and architect VDI solutions. Andre's passion led him to found the APAC Virtualization Podcast and speak at conferences and public events. Due to his creativity and accomplishments, Andre received the VMware Virtual Desktop Ingenuity Award'2009, and was recognized as vExpert recipient award for multiple consecutive years. Andre is currently enjoying helping Nutanix as Sr. Director, Partner Innovation & Vertical Alliances.

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