Patent attributes
Described are techniques for storing data. A write operation is received that is directed to a target logical address of a logical device where physical storage has not been allocated for the target logical address. The logical device has a service level objective denoting a performance goal to be maintained with respect to I/O operations for the logical device. A storage tier is selected from a plurality of storage tiers from which to allocate storage for storing write data of the write operation. The selecting is performed in accordance with determining a match between an expected level of performance of the storage tier and the performance goal. First physical storage is allocated from the storage tier. A logical address subrange of the logical device is mapped to the first physical storage. The write data is stored in the first physical storage at a location mapped to the target logical address.
