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Displaying posts with tag: EBS (reset)

RAID 10 your EBS data
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When I spoke at Percona Live (video here) on running an E-commerce database in Amazon EC2, I briefly talked about using RAID 10 for additional performance and fault tolerance when using EBS volumes. At first, this seems counter intuitive. Amazon has a robust infrastructure, EBS volumes run on RAIDed hardware, and are mirrored in multiple availability zones. So, why bother? Today, I was reminded of just how important it is. Please note that all my performance statistics are based on direct experience running a MySQL database on a m2.4xlarge instance and not on some random bonnie or orion benchmark. I have those graphs floating around on my hard drive in glorious 3D and, while interesting, they do not necessarily reflect real-life

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Dissection of EC2 / EBS volume
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So during preparation of XtraDB template for EC2 I wanted to understand what IO characteristics we can expect from EBS volume ( I am speaking about single volume, not RAID as in my previous post). Yasufumi did some benchmarks and pointed me on interesting behavior, there seems several level of caching on EBS volume.

Let me show you. I did sysbench random read IO benchmark on files with size from 256M to 5GB with step 256M. And, as Morgan pointed me, I previously made first write, to avoid first-write penalty:

dd if=/dev/zero of=/dev/sdk bs=1M

for reference script is:

PLAIN TEXT CODE:
  • #!/bin/sh
  • set -u
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    Thoughts on the Cloud
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    For those of you who have been under a rock for the last several years, there is a buzz-phrase floating around—cloud computing. If you haven’t been paying attention, it is time to wake up.

    While I could spend an entire blog post—if not several—on a definition of cloud computing, I will be talking only about cloud computing in the sense of companies moving servers from their building or network operations center to running virtual servers in this computing cloud.

    While there are a number of companies providing virtual servers, the most visible is Amazon, with their Amazon Web Services (AWS). I will be talking about AWS in this post as it is the service with which I am most familiar. It seems like every month, AWS rolls out new options and services. Just recently Amazon announced that you can now run on AWS the Windows operating system along with

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    Showing entries 1 to 3

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