Storage Class Description

The Storage Class QoS property allows you to specify the preferred storage media to use for a logical volume.

A Storage Class is a specific categorization of SAS physical storage, each category having distinct characteristics with regard to capacity and to data access performance. Available Storage Classes:

Performance SSD: Specifies that the data is stored on solid state drives (SSDs) that are optimized for the performance of balanced read and write operations.
Capacity SSD: Specifies that the data is stored on SSDs that are optimized for the performance of capacity and for read operations. The write performance for this Storage Class is sacrificed somewhat to achieve the optimizations for read performance and for capacity.
Performance Disk: Specifies that the data is stored on high-speed hard disk drives (HDDs). This Storage Class sacrifices some capacity to reduce the access time and the latency of the read operations and of the write operations.
Capacity Disk: Specifies that the data is stored on high-capacity, rotating HDDs. This Storage Class optimizes capacity at some sacrifice of speed. For a storage system that does not include tape storage as an option, this Storage Class always provides the lowest cost for each GB of capacity.

A Storage Class relates to storage objects in the following ways:

A newly created LUN that is using regular QoS (a single-tiered LUN) is associated with one Storage Class.
A newly created LUN that is using QoS Plus (an auto-tiered LUN) is associated initially with one Storage Class. At a later time, an auto-tiered LUN migrates fully or partially onto the most cost-effective and the most performance-effective Storage Classes according to the use patterns and to the QoS priority level of the LUN.
A newly created, single data tier filesystem is associated with one Storage Class.
A newly created filesystem that has multiple data tiers can be associated with multiple Storage Classes. In this case, each data tier is based on a different class. Furthermore, the administrator or the file owner can migrate a file that resides in a multiple-tier filesystem from one Storage Class to another Storage Class.
Oracle FS System Manager (GUI) shows the capacity that is available for each Storage Domain. For a given Storage Domain, the GUI displays the capacity by Storage Class and by drive group.