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There's an I/O penalty for working on AWS, but it's on the order of tens of percent, not hundreds. That's rather optimistic. The EC2 ephemeral disks normally
by moe 14y ago
There's an I/O penalty for working on AWS, but it's on the order of tens of percent, not hundreds.
That's rather optimistic.
The EC2 ephemeral disks normally clock in at 6-7ms latency, that's >13x slower than dedicated disks.
EBS clocks in at 70-200ms latency, that's >5x slower than a dedicated SAN.
And that is under optimal conditions. In reality the I/O performance on EC2 frequently degrades by orders of magnitude for long periods of time.
- timr 14y ago"The EC2 ephemeral disks normally clock in at 6-7ms latency, that's >13x slower than dedicated disks." Um. Are you comparing hard drives to SSDs? Rotational latency for a 15k drive is a couple of milliseconds. Seek time for server drives varies from 3-10ms. EC2 disks are slow, but there's no way they're 13 fold slower than your average server drives. And 6-7ms is just about on par with commodity hardware.
- moe 14y agoAre you comparing hard drives to SSDs? No, but I mistyped the numbers. That was supposed to read: 60-70ms.