US 2015/0039826 A1 · SUB-LUN AUTO-TIERING

Abstract

Embodiments of the invention include systems and methods for auto-tiering multiple file systems across a common resource pool. Storage resources are allocated as a sub-LUN auto-tiering (SLAT) sub-pool. The sub-pool is managed as a single virtual address space (VAS) with a virtual block address (VBA) for each logical block address of each data block in the sub-pool, and a portion of those VBAs can be allocated to each of a number of file systems. Mappings are maintained between each logical block address in which file system data is physically stored and a VBA in the file system's portion of the virtual address space. As data moves (e.g., is added, auto-tiered, etc.), the mappings can be updated. In this way, multiple SLAT file systems can exploit the full resources of the common SLAT sub-pool and maximize the resource options available to auto-tiering functions.

Claims20

Dependent claims

A method for auto-tiering in a storage resource pool having a number of storage classes, each with one or more storage devices configured to store a plurality of data blocks, the method comprising:

allocating, from a top level storage manager to a sub-LUN auto-tiering (SLAT) storage manager, a SLAT sub-pool including a portion of storage resources of each of at least two storage classes;
generating a common SLAT address space having a plurality of logical block addresses each corresponding to a data block of the SLAT sub-pool;
and
initializing a SLAT file system as a virtual address space of a predetermined total capacity in the SLAT address space using the SLAT storage manager.

1 more element

A data storage system comprising:

a plurality of storage classes, each comprising one or more storage devices configured to store a plurality of data blocks;
a top-level storage manager configured to manage storage resources across the plurality of storage classes;
a sub-LUN auto-tiering (SLAT) storage manager configured to manage a SLAT sub-pool including a portion of storage resources of each of at least two storage classes allocated from the top-level storage manager and to generate a common SLAT address space having a plurality of logical block addresses each corresponding to a data block of the SLAT sub-pool;
and
at least one SLAT file system comprising a virtual address space of a predetermined total capacity, each virtual address space configured to be mapped to a corresponding one of the plurality of logical block addresses in the SLAT address space according to a SLAT mapping.

2 more elements

Dependencies are inferred from the claim text.

Sub-lun auto-tiering

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Sub-lun auto-tiering

Life of this patent

Abstract

Claims20