Linux device mapper writecache

Kicking It Into Overdrive


By using the newly introduced dm-writecache device mapper Linux kernel module, you are able to achieve a noticeable improvement in random write throughput when writing to slower disk devices. Also, nothing is preventing you from using the remainder of the NVMe device in the original volume group and mapping it as a cache to other, slower devices on your system.

The Author

Petros Koutoupis is currently a senior performance software engineer at Cray for its Lustre High Performance File System division. He is also the creator and maintainer of the RapidDisk Project. Petros has worked in the data storage industry for well over a decade and has helped to pioneer many of the technologies unleashed in the wild today.

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