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Hyper-converged infrastructure box maker Scale Computing is set to bring in NVMe flash connectivity in 2017. That’s according to Scale founder and CEO Jeff Ready, who said the blisteringly fast PCIe-based protocol for flash will form one of several possible flash and disk-based tiers of storage in Scale’s products going forward.
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“NVMe is on the roadmap for this year. More importantly, we will have flash in multiple tiers – 3D NAND, TLC, MLC – as well as NVMe, all-flash with different characteristics,” he said.
This tiering, said Ready, will be based on Scribe, which is the company’s scale computing reliable independent block engine. Scribe is a clustered block-storage software layer – that forms part of Scale’s HyperCore KVM-based hypervisor – and is designed to provide direct block-level storage access to virtual machines running on the hypervisor.
Scribe aggregates storage media into a single pool and handles traffic to physical blocks on drives, provides allocation to different tiers of storage as well as functions such as data protection.
NVMe promises significant storage latency reductions and increases in throughput, largely by being able to handle a huge increase in the number of queues and of queue depth compared to the SAS and SATA spinning disk-era protocols.
NVMe is a PCIe-based protocol developed for flash storage. Physically, NVMe hardware is compatible with PCIe slots but use with a storage controller, as found in most storage array products, will introduce a bottleneck to the input/output (I/O) path to some extent; one that NVMe was designed to remove.
According to Scale, Scribe runs out of band from the data path and so does not form a bottleneck. It is therefore ready to make good use use of NVMe.
Read more about NVMe
- NVMe over fabrics takes the built-for-flash advantages of the PCIe-based protocol, and allows NVMe to be sent via Fibre Channel, Ethernet and Infiniband networks.
- NVMe brings blistering performance gains over existing HDD-era disk protocols, and is a straight swap-in for PCIe server-side flash with array and hyper-converged products on the way.
“Scribe uses parallel paths from the central processing unit to storage, using multi-queuing,” said Ready.
“Most hyper-converged products mimic the storage controller via a virtual machine and in most cases that virtual machine is running a file system. I/O is therefore typically traversing several file systems on one round trip.”