Simple access logging will wipe out a small boot volume’s credits on even a moderate workload, as will a swap file. Small volumes not only have smaller baselines but slower rates of replenishment. This is difficult to manage because something as benign as a noisy log file can keep your credit balance persistently low, and an isolated burst can steal performance for hours.Ĭredit depletion becomes even more problematic with ultra-small volumes such as instance root volumes. Therefore, your average utilization cannot exceed 330 IOPS, or your rate of depletion will exceed the rate of replenishment.
AWS EBS PRICING FULL
At 100GB, our volume can run at 3,000 IOPS for approximately 30 minutes before depleting the bucket, but must wait 5 hours to replenish.Īs a rule of thumb, you can burst to the full 3000 IOPs roughly 10% of the time for any given volume size (under 1000GB). Unfortunately, the bucket is small and replenishes slowly. But, it can burst up to 3,000 IOPS using a leaky bucket credit system. At that size, the volume has a baseline performance of 300 IOPS (3 x 100GB), comparable to a 7200RPM SATA drive. Baseline IOPS and Burst Limitsįirst, we take a look at smaller volumes, which often suffer easily avoidable performance problems. While you might have the potential to hit 16,000 IOPS on a default GP2 instance, you also need to contend with the throughput limits. That means that only volumes of 5.3TB or larger can hit that max. The actual max IOPS for any specific volume is based on size, specifically 3 IOPS per GB up to the maximum. Let’s take a look at the documented performance characteristics of a GP2 volume:Īt first glance, these look like great numbers, but they don’t tell the full story. As a result, they are the most widely deployed volume type by far. This article focuses specifically on GP2 volumes, which are SSD-backed, low cost, and the default in many regions. While there is some truth to that, I often see EBS implementations that fail to take advantage of cheap or even free options to boost performance.
GP2 Performance in EBS is widely misunderstood, resulting in many writing off EBS as a choice between “slow” or “expensive”.
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