Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Context: We are experiencing problems with large Solr indexes hosted on machines in EC2. One theory that's been offered is that this could be due to intermittent IO problems or spikes in IO latency.

Has anyone seen short (or long, I suppose) IO slowdowns on EC2?

A related question is whether anyone has seen any benchmarks of EBS compared to the "local" disk.

I know there's a hundred people jumping to their keyboards to tell me that IO on virtualized infrastructure sucks. Thanks, but my question is about whether it always sucks equally, or if sometimes it suddenly starts sucking more than usual.

share|improve this question
up vote 1 down vote accepted

Heroku has a blog post about EBS performance that might provide some insight.

share|improve this answer
Thanks, that's exactly what I was looking for. – Kevin Peterson Nov 25 '09 at 1:18

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.