Techniques for storing data

A system comprising:

• a processor;
• and
• a memory comprising code stored therein that, when executed, performs a method comprising:
• receiving a write operation directed to a target logical address of a logical device where physical storage has not been allocated for the target logical address, said logical device having a service level objective denoting a performance goal to be maintained with respect to I/O operations for the logical device;
• selecting a storage tier from a plurality of storage tiers from which to allocate storage for storing write data of the write operation, wherein said selecting is performed in accordance with determining a match between an expected level of performance of said storage tier of physical storage devices having a same physical device type and said performance goal of the logical device as denoted by the service level objective, wherein said selecting includes:
• determining whether the logical device has any associated service level objective denoting a performance goal to be maintained with respect to I/O operations for the logical device;
• and
• responsive to determining that the logical device does not have any associated service level objective, using a default ranking of the plurality of storage tiers to select the storage tier as a highest ranked one of the plurality of storage tiers having available capacity, wherein said plurality of tiers are configured into RAID groups having write performance penalties, wherein said default ranking of the plurality of storage tiers is ranked in accordance with one or more primary criteria including media type characteristics and one or more secondary criteria including the write performance penalties associated with different RAID types and configurations, wherein each of the different RAID types with an associated configuration has an associated one of the write performance penalties denoting a number of additional back-end I/O operations incurred when issuing a single write operation that stores data in a RAID group configured with said each RAID type and associated configuration;
• allocating first physical storage from the storage tier;
• mapping a logical address subrange of the logical device to the first physical storage;
• and
• storing the write data in the first physical storage at a physical storage location mapped to the target logical address.

A non-transitory computer readable medium comprising code stored thereon that, when executed, performs a method that stores data comprising:

• receiving a write operation directed to a target logical address of a logical device where physical storage has not been allocated for the target logical address, said logical device having a service level objective denoting a performance goal to be maintained with respect to I/O operations for the logical device;
• selecting a storage tier from a plurality of storage tiers from which to allocate storage for storing write data of the write operation, wherein said selecting is performed in accordance with determining a match between an expected level of performance of said storage tier of physical storage devices having a same physical device type and said performance goal of the logical device as denoted by the service level objective, wherein said selecting includes:
• determining whether the logical device has any associated service level objective denoting a performance goal to be maintained with respect to I/O operations for the logical device;
• and
• responsive to determining that the logical device does not have any associated service level objective, using a default ranking of the plurality of storage tiers to select the storage tier as a highest ranked one of the plurality of storage tiers having available capacity, wherein said plurality of tiers are configured into RAID groups having write performance penalties, wherein said default ranking of the plurality of storage tiers is ranked in accordance with one or more primary criteria including media type characteristics and one or more secondary criteria including the write performance penalties associated with different RAID types and configurations, wherein each of the different RAID types with an associated configuration has an associated one of the write performance penalties denoting a number of additional back-end I/O operations incurred when issuing a single write operation that stores data in a RAID group configured with said each RAID type and associated configuration;
• allocating first physical storage from the storage tier;
• mapping a logical address subrange of the logical device to the first physical storage;
• and
• storing the write data in the first physical storage at a physical storage location mapped to the target logical address.