Pinning a file to a tier is another term for assigning it to one. A file must be on a volume that is hosted by the same tiered storage space in order to be pinned to that storage tier. When tier optimization occurs the next time, a file that is already assigned to a different tier will shift tiers if you pin it.
In Windows Server 2012 R2, Microsoft added tiered storage to Storage Spaces. The idea is to combine inexpensive, high-capacity hard drives with pricey, high-speed solid-state drives to provide the best of both worlds. For instance, you might make a number of 8-column virtual disks by combining 12 x 200 GB 65,000 IOPs SSDs and 48 x 6 TB 7200 RPM HDDs into a JBOD.
Each virtual disk has the option of becoming tier-based, taking up space on both the SSD and HDD tiers.
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