When using a tiered storage solution for a repository volume you will most likely experience slow performance. Tiered storage consists of tiers. Each tier contains different speed drives. For example a three tiered storage solution may have Tier 1 consisting of SSD drives, Tier 2 consisting of 7,200 RPM drives. and Tier 3 consisting of 5,400 RPM drives.
Performance reduction is due to the how tiered storage manages data and moves data across different performing tiers. For thick provisioned repository files, spreading the files over several different speed tiers can reduce core performance to a crawl.
Tiered storage is the assignment of different categories of data to various types of storage media to reduce total storage cost. Tiers are determined by performance and cost of the media, and data is ranked by how often it is accessed. Tiered storage policies place the most frequently accessed data on the highest performing storage. Rarely accessed data goes on low-performance, cheaper storage.
Tiering does not treat the dfs.records as a single file and spreads it across different speed tiers. As we thick provision the dfs.records file, this leads to performance issues.
NOTE: Virtual disk policies are recommendations for non-appliance HW only. Virtual disk policies for DL appliances are preconfigured during provisioning and should not be changed for any reason.