You haven't eliminated them. You've just moved them into a dedicated co-processor.
Co-processors are cheap when they're ubiquitous, like DMA. Co-processors are expensive when they're in custom hardware, like K-V stores. I'll get more performance/$ by using standard SSDs than you will by buying specialized hardware. And because the workload is IO dominated, we'll probably both get the same absolute performance from the same server (that differs only in storage devices).
You'll only recoup those CPU cycles back if you bin pack CPU heavy workloads next to IO heavy workloads, which is rarely desirable for storage services, because it adds a great deal of variance. But you just spent shit loads of money eliminating variance by going to SSD.
Co-processors are cheap when they're ubiquitous, like DMA. Co-processors are expensive when they're in custom hardware, like K-V stores. I'll get more performance/$ by using standard SSDs than you will by buying specialized hardware. And because the workload is IO dominated, we'll probably both get the same absolute performance from the same server (that differs only in storage devices).
You'll only recoup those CPU cycles back if you bin pack CPU heavy workloads next to IO heavy workloads, which is rarely desirable for storage services, because it adds a great deal of variance. But you just spent shit loads of money eliminating variance by going to SSD.