One solution to improve performance in this constellation is to use an additional cache on an SSD that caches the most frequently requested files or disk blocks. Of course, due to the nature of our FTP, which provides mirrors for a whole bunch of different projects, we do get a large amount of random I/O. the more different files are requested at the same time. While these arrays easily deliver more than a Gigabyte per second when reading sequentially, this performance drops rapidly the more random the I/O gets, i.e. While we use a hardware RAID6 which does deliver pretty decent read speeds, we’re still using traditional magnetic hard drives, not SSDs. Recently, we’ve frequently reached the I/O capacity of our RAID array during peak hours, meaning that increasingly often downloads were not limited by network speed, but by how fast our disks could deliver the data.
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