Delivering the right data at the right performance level

Most data centers have different classes of storage media such as SATA disks, SAS disks and SSDs/Flash. Each class can have many different subcategories, especially SSDs/Flash, and they all differ in terms of access speed, capacity, and price. You want your most frequently accessed data to stay on the fastest storage media, but the fastest media is also the rarest because it is expensive.



Tiering vs Caching: What’s the Difference

At first glance, tiering and caching solutions may look similar but there are fundamental differences in the utilization of faster storage and the underlying technology leveraged to identify and speed up your most frequently accessed data.

High Speed Caching Diagram

High-Speed Caching is a proprietary caching algorithm that accelerates I/O by leveraging RAM as a read and write cache. DataCore supports up to 8 TBs of high-speed cache per node, creating a true “mega-cache” to turbocharge application performance.

RAM is a commodity component and therefore relatively inexpensive, yet it possesses outstanding performance characteristics and lacks the shortcomings that are attributed to Flash devices. RAM is an excellent technology to leverage for accelerating I/O performance and delivers a very high benefit-to-cost ratio across the entire storage architecture.

High-Speed Caching is critical for maintaining application performance because RAM is many orders of magnitude faster than the fastest Flash technologies and it resides as close to the CPU as possible. It is the fastest storage component in the architecture, delivering a 3-5x performance boost to applications and freeing up application servers to perform other tasks. It also extends the life of traditional storage components by minimizing the stress experienced from disk thrashing.

Application workloads are hard to predict. Auto-Tiering is a real-time intelligent mechanism that continuously positions data on the appropriate class of storage based on how frequently the data is accessed. The result is superior application performance and lower TCO across the entire storage architecture.

Tiered storage avoids the need to invest heavily in expensive Flash technology. Industry statistics show that, on average, only 15-20% of a company’s entire data footprint benefits from Flash storage since the remaining percentage is considered largely dormant.

According to Gartner, “The access patterns, value and usage characteristics of data stored within storage arrays varies widely, and is dependent on business cycles and organizational work processes. Because of this large variability, data stored within storage devices cannot be economically and efficiently stored on the same storage type, tier, format or media.”


Auto-Tiering leverages any combination of Flash and traditional disk technologies, whether it is internal or array based, with support up to 15 different storage tiers. For example:

1 Ultra-High-Speed Disk (Flash)  15%
2 High Speed Disk (SAS 15k)  25%
3 Capacity Disk (SAS 7.2k NL)  60%
4 Test/Dev Disk (SATA)  As Needed
5 Archival Cloud Disk  As Needed


As more advanced disk technologies become available, existing storage tiers can be modified as necessary and additional ones can be added to further diversify the tiered storage architecture.


  • 動的データ分析:データアクセスパターンのリアルタイム監視で最適な階層配置を実現
  • シームレスな移行: ストレージ階層間で無停止かつ自動化された移動を実現
  • クロスデバイスでの一貫性:さまざまなベンダーのデバイス間で均一な自動階層化を実現
  • 効率的なスペース利用:最適なデータ配置でストレージ容量を最大化
  • 完全自動化:一度設定すればその後のすべてが自動化され、手動介入が不要に


In the realm of block storage, capacity optimization is a key requirement to reduce the storage footprint by compressing data and by eliminating redundant data segments. SANsymphony introduces Adaptive Data Placement that expands the auto-tiering capability to work in tandem with inline deduplication and compression.




  • ホットデータで可能な限り最高のパフォーマンス
  • コールドデータのフットプリントを可能な限り最小化