For large amounts of data, tape continues to have the best economy of scale for storage. 90% of the world's data was created in the last two years with 20% of that data being active and operational. Businesses typically want the important active data to have the fastest access and for the data that is important but not accessed often it makes sense to store it on the most cost effective storage platform. Using Linear Tape File System Enterprise Edition (LTFS EE) tape tier with Elastic Storage is a high quality way to stretch the storage savings by balancing the cost efficient large capacity of tape libraries with access requirements of Tier 1 storage. Based on business requirements Elastic Storage provides a seamless policy driven Dynamic Tiering that will put the data in the best location on the best tier (performance and cost) at the right time. Figure 1 shows Hot Data needing the fastest access times will reside on flash and the Cold Data needing automatic access with the lowest cost per GB will migrate to tape.
Here are two more configurations showing how automated migration polices can be implemented based on business needs. Figure 2 shows how tiering can follow the path from the fastest online storage device though each tier to offline tape. Based on the policies data can move from any tier to tape and also be recalled to any tier. Figure 3 follows a top to bottom flow based on a combination of last access date, file size and percentage full of storage pool.
LTFS EE enables IBM tape libraries to replace tier 2 and 3 disk storage in Elastic Storage environments (GPFS-based tiered disk). It helps reduce storage expense for data that does not need to access performance of primary disk. To learn more about LTFS EE there is a new draft available; IBM Linear Tape File System Enterprise Edition V184.108.40.206 Installation and Configuration Guide