Removing the ultra-high speed tier converts a Qtier storage pool into a regular storage pool.
You can only remove the ultra-high speed tier if the allocated storage pool space is less than the remaining storage pool capacity (Total storage pool capacity - Ultra-high speed tier capacity = Remaining capacity).
This feature is useful in the following situations:
You want to use the SSD drives for another purpose.
You want to increase the amount of SSD over-provisioning in the ultra-high speed tier.
You want to change the RAID configuration of the ultra-high speed tier.
QTS creates a background task. The status of the storage pool changes to Removing SSD Tier....