Managing A Cache On Storage Devices Supporting Compression

A method, comprising steps of:

• writing data blocks to a cache in a flash memory device that exposes a logical address space that is larger than a physical address space of the flash memory device, wherein writing data blocks comprises issuing I/O requests to said flash memory device to write data, each I/O request specifying a respective logical address within said logical address space to which to write data;
• and
• periodically performing:
• determining whether a realized physical usage of said flash memory device has reached a first threshold, and
• if the realized physical usage has reached a first threshold, removing a set of data blocks from said cache, wherein removing a set of data blocks from said cache comprises issuing I/O requests to trim data at logical addresses within the logical address space.

One or more non-transitory storage media storing instructions which, when executed by one or more computing devices, cause performance of:

• writing data in memory blocks of a flash memory device that exposes a logical address space that is larger than a physical address space of the flash memory device, wherein writing data comprises issuing I/O requests to write data, each I/O request specifying a respective logical address space in said logical address space to which to write data;
• and
• periodically performing:
• making a first determination that a realized physical usage of said flash memory device has reached a first threshold, and
• in response to making said first determination, issuing I/O requests to trim data at logical addresses within the logical address space.

One or more non-transitory storage media storing instructions which, when executed by one or more computing devices, cause performance of a method comprising steps of:

• writing data blocks to a cache in a flash memory device that exposes a logical address space that is larger than a physical address space of the flash memory device, wherein writing data blocks comprises issuing I/O requests to said flash memory device to write data, each I/O request specifying a respective logical address within said logical address space to which to write data;
• and
• periodically performing:
• determining whether a realized physical usage of said flash memory device has reached a first threshold, and
• if the realized physical usage has reached a first threshold, removing a set of data blocks from said cache, wherein removing a set of data blocks from said cache comprises issuing I/O requests to trim data at logical addresses within the logical address space.