Storage metrics: Bandwidth, “IOPs”, and Latency

Typically when I talk with clients about storage metrics for performance, they will typically focus on either bandwidth or "IOPs". But really there are three dimensions of storage performance! Let's consider these three storage performance metrics and how we can design systems to work around shortcomings. First, there is bandwidth (or throughput). This is a … Continue reading Storage metrics: Bandwidth, “IOPs”, and Latency

Modeling disk performance (traditional RAID)

Many factors go into determining the performance of a storage system, and a common question is: What will be the performance of this storage system? Ultimately, actual performance can only be determined through benchmarking with the actual workloads, but this isn't always possible when planning to acquire a storage system. We need a way to … Continue reading Modeling disk performance (traditional RAID)