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2024年3月22日发(作者：java核心代码是哪部分)
New NVMe All-Flash A250 System – A Technical Deep Dive
NetApp has introduced a new entry-level NVMe All-Flash system for small and medium-sized
enterprises, called AFF A250. Doing that, NetApp has completed its NVMe offer, which now spans from
A250 through the mid-range class A400 system to the robust A800. The big news, as well, is that the
latest version of ONTAP that comes with A250, besides the support for SAN and NAS protocols, will
provide support for the S3 protocol (object storage). That makes NetApp a steady leader in the field of
UNIFIED FAS storage systems.
A250 Hardware
New A250 comes in a 2U internal chassis, which contains two controllers and two redundant power
supplies. On the frontend of the device there is a space, provisioned to store up to 24 internal NVMe
SSDs. The device supports expansion with one additional external NS224 NVMe shelf. It is also possible
to expand it with one DS224C or DS2246 SAS shelf, but only to transfer existing ones. When purchasing
A250 devices, it is not possible to purchase additional DS224C shelves. To conclude, it is possible to
expand the device with a single NVMe or SAS shelf.
The controllers on A250, work in Active/Active mode, as usual. It means that the controllers work
independently, each serving their workloads.
In cases of failure of a single controller, the other one, in addition to its own, takes over the tasks of
the controller that is out of function (takeover occurs in the interval from 2 to 15 seconds).
This process is transparent, meaning that the applications do not stop working during
the failover operation.
On the occasion of a sudden power failure, all unregistered data will be copied to the controller's
internal flash memory.
The data will be saved, in cases of longer failures (battery-assisted NVRAM memory).
AFF A250 has 2x64-bit 12-core Skylake-D CPUs and 128GB RAM.
Scale-out
Besides the expansion with one more shelf, A250 can be extended with the additional NetApp FAS/
AFF systems (scale-out) - with up to 24 nodes in NAS or up to 12 nodes in SAN environment. The nodes
added to a scale-out cluster can be of different performance and different generations. To check the
compatibility list, please visit NetApp's Hardware Universe portal or contact
your local Partner.
NVMe
NetApp A250 is an end-to-end NVMe system, meaning it uses both the NVMe protocol to access SSDs
on the storage system and the NVMe over Fabrics transport protocol for host connections. This new
protocol is designed especially for future-generation flash and SSDs, and it is significantly simpler and
optimized to deliver maximum throughput and fastest response time. NVMe supports the execution
of tens of thousands of parallel commands, can efficiently use not only SSDs, but also multi-core
processors and gigabytes of memory, and parses and manages data successfully. By using the NVMe
standard, it is possible to deliver 60% more performance, as well as to reduce delays by up to 50%
Connectivity
In terms of connectivity, there are two mezzanine slots per controller, which can accommodate the
following types of cards:
- 4-port 32Gbps FC and 4-port 10 / 25Gbps Ethernet (RoCEv2) for host connectivity
- 2-port 100Gbps Ethernet (RoCEv2) for added NVMe shelf (slot 1 only) or 4-port 12Gb SAS for
additional DS224C or DS2246 shelf.
- Each controller has two 10Gbps BASE-T ports for host connectivity, as well as 2x 25GbE ports for HA
and Cluster Interconnect connection (for scale-out needs).
The figure below shows one of the two A250 controllers inside the chassis.
Besides the internal drives, AFF A250 supports up to 24 NVMe SSDs or 24 SAS SSDs, in an additional
shelf. Find currently supported capacities on NetApp Hardware Universe portal:
or check it up with your local Partner.
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