Faster Block Device Performance with NVMe PCIe SSD based dm-cache on RHEL 7 dm-cache (Device Mapper cache) is a device mapper target to improve performance of a block device (e.g., a spindle device ) HDD by dynamically 概要: dm-cache (Device Mapper cache) is a device mapper target to improve performance of a block device (e.g., a spindle device ) HDD by dynamically dm-cache (Device Mapper cache) is