flashcache-dkms software package provides write-back block device cache for Linux (DKMS version), you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install flashcache-dkms
flashcache-dkms is installed in your system.
Make ensure the flashcache-dkms package were installed using the commands given below,
$ sudo dpkg-query -l | grep flashcache-dkms *
You will get with flashcache-dkms package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Kernels |
| Package | flashcache-dkms |
| Version | 3.1.3+git20150701-4 |
| Description | write-back block device cache for Linux (DKMS version) |
| Sub Section | Kernels |