Will moving data from EBS to ephemeral storage improve MySQL query performance?

Question

I am using EBS volume to store MySQL data. I do have enough space on ephemeral device as well. I will move the data to /root/, provided it will improve the query performance

Answer 1

Always remember that Ephemeral storage will be lost on stop/start cycles.

I would be wary of anyone saying EBS is faster than ephemeral storage, I have read more than one real world experience saying that EBS is less performant than ephemeral storage. A recent article I can remember the link to is DuckDuckGo's experience:

• Got off EBS completely due to EBS being involved in most of the large failures.
• Also experienced performance variability with EBS.
• The new Provisioned IOPs is supposed to handle that, but having fewer extra moving pieces in the architecture is better.
• May experiment with PIOPs in the future, though the current non-EBS architecture is working well.
• Found 4 ephemeral disks performed better than striping 8 EBS disks.