Proprietary: Pure sticks to flash module design, becomes a direct flasher
NVMe in FlashArray speed-up
Pure Storage has moved away from SSDs in giving its FlashArray an NVMe makeover, halving its latency and doubling its bandwidth.
A FlashBlade storage blade has 8 or 52TB capacity, on-board NV-RAM, super-cap protected write buffer, an FPGA and two ARM cores, and is connected to its parent system with PCIe and a proprietary protocol. The FlashArray//X storage blade equivalent is called a DirectFlash module and there can be two of them. It still uses a PCIe physical connection but with the NVMe protocol.
By sidestepping SSD use, Pure says it avoids data access being slowed by an SSD’s Flash Translation layer, garbage collection, and disk-based encryption and error correction.
The FlashArray//x has:
- //x70 controller with NVMe,
- DirectFlash software,
- Up to two packs of 10 x 2.2, 9.1 and 18.3TB DirectFlash modules,
- 1PB effective capacity in 3U, 183 TB raw
- 15PB per rack and more than 100 GByte/sec in bandwidth,
- Telemetry data sent to a Pure cloud every 30 secs.
The FlashArray//M features 1.9, 3.8 and 7.6TB flash drives.
FlashArray//X X70 controller data.
FlashDrive base card
The DirectFlash modules are described as being software-defined and new Purity array OS software provides flash management for all attached DirectFlash modules with global:
- Adaptive IO control with IO scheduling and flash-level QoS,
- Allocation, wear-levelling and garbage collection,
- Block-level telemetry, bad block management and encryption.
The supplier claims this makes its Flash Drive implementation 15 to 30 per cent more efficient than the equivalent population of SSDs, meaning less over-provisioning and better endurance, as well as providing data access latency in the 100s of microseconds area.
Compared to Pure’s FlashArray//M, the //X should have half the latency on workloads featuring a 65/35 read/write mix with snapshots, and twice the bandwidth. Pure says it should deliver maximum performance from 10 FlashDrives modules.
Pure’s marketing pitch for the FlashArray//X centres on it being ready for the cloud era, but there’s no connection with the IPO-chasing Cloudera. It suggests the //X can be used for tier 1 storage consolidation, database acceleration and a top of rack direct-attached storage replacement for a bunch of servers in the rack. The servers would be running apps like Cassandra, REDIS, Splunk, MongoDB, MySQL and the like.
The //M can be used for VMware, Microsoft, Docker and OpenStack work with the //M10 being the entry-level box for things like Windows Servers’ work.
FlashBlade is then sitting there ready for the unstructured data storage applications such as analytics.
FlashArray//M and //X comparison
For Pure’s existing customer base, every existing FlashArray//M can upgrade to the //X with no downtime. The controller has to be upgraded to the//X70 and the existing SAS SSD shelves can be retained, with NVMe Direct Flash modules added or the SAS shelves replaced by NVMe DirectFlash modules
Pure Storage has fulfilled its promise to add NVMe drives inside its FlashArrays and so gained useful decreases in latency and increases in bandwidth. That’s not unexpected. What is a little surprising is that it has doubled down on its proprietary flash module design, introduced with FlashBlade.
It has taken SSD-level functionality such as garbage collection, over-provisioning for endurance, error correction, etc, and provided them globally in the array as software running in the array controllers.
This brings, it says, savings in over-provisioned flash cells and also better endurance.
The 1PB effective capacity claim, for a 3U FlashArray//X filled with 20 x 18.3TB FlashDrives, seems optimistic except for the most deduplicatable and compressible workloads. Pure says that this 1PB of effective is based on all overheads and the average data reduction that they observe across the entire fleet.
Get yourself a FlashArray//X datasheet here (PDF). FlashArray//X with 2.2TB and 9.1TB DirectFlash blades will be available on a restricted basis - directed availability - this quarter, and be generally available in the third quarter along with the 18.3TB DirectFlash module. ®
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