DS8870 - Thin provisioning and ESE repository
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For several years already the DS8000 series has featured two types of space efficient volumes:
Track space efficient (TSE) volumes are used as target volumes of a FlashCopy Space Efficient operation and require the definition of a repository from which tracks are gradually allocated.
Extent space efficient (ESE) volumes are the actual thin provisioned volumes that can be used by host applications.The dynamic allocation increments for ESE logical volumes is based on the same existing 1 GB extents used for standard volumes.
With the introduction of R 7.2, there is now an option to create an ESE Repository for the ESE logical volumes
While it may seem simpler to create ESE logical volumes without a repository, there are some benefits to using a repository.
To read more about ESE repository and new DSCLI controls for ESE volumes, refer to the new draft version of the IBM RedPaper, DS8000 Thin Provisioning, REDP-4554