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Auto-Tiering

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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.

Auto-tiering allows you to store, and subsequently read, your data on the storage media with the best fit based on predefined rules, or policies. This approach to tiered storage data classes, automatically finds which data sets are most accessed by your applications (your hot data) and places it on the fastest storage. The same is true for your warm and cold data – it is automatically placed on second-tier or lower-tier storage. All of this happens dynamically in real time yet invisible in the background. Depending on your data usage, the classification may rank up or down automatically, allowing you to have the best speeds for your mission- and business-critical information. Explore the features below to see how you can maximize application speed across your entire organization and tailor your storage infrastructure to your business needs.

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 est un algorithme de mise en cache propriétaire DataCore prend en charge jusqu’à 8 To de cache haute vitesse par nœud, créant un véritable « méga-cache » afin de booster les performances de l’application.

La RAM est une composante produit, donc relativement peu coûteuse, mais elle possède des caractéristiques de performances exceptionnelles, sans les inconvénients imputés aux périphériques flash. La RAM est une excellente technologie à exploiter pour accélérer les performances d’I/O et offre un rapport avantages/coûts très élevé sur l’ensemble de l’architecture de stockage.

La fonction High-Speed Caching est essentielle pour maintenir les performances de l’application car la RAM est beaucoup plus rapide que les meilleures technologies Flash et réside au plus près du processeur. Elle est le composant de stockage le plus rapide de l'architecture. Elle multiplie les performances des applications de 3 à 5 fois et libère les serveurs d’applications pour d’autres tâches. Elle prolonge également la durée de vie des composants de stockage traditionnels en minimisant la tension occasionnée par la surcharge des disques.

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.”

automated storage tiering diagram

L'Auto-Tiering exploite toute combinaison de technologies de disques Flash ou classiques, qu'elle soit internes ou basées sur des baies, avec la prise en charge de jusqu'à 15 niveaux de stockage différents. Par exemple :

Niveau Détails  % DE LA PRODUCTION TOTALE
1 Disque ultra-rapide (Flash)  15 %
2 Disque haute vitesse (SAS 15000 tr/min)  25 %
3 Disque de capacité (SAS 7200 tr/min NL)  60 %
4 Disque de test/développement (SATA)  Au besoin
5 Disque d’archivage Cloud  Au besoin

 

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.

Démarrez avec la référence en matière de data center software-defined nouvelle génération