Re: Raid Issue on EC2 Datastax ami, 1.2.11

Hi Aaron, As you can see in the picture, there is not much steal on iostat. That's the same with top. https://imageshack.com/i/0jm4jyp Philippe 2013/12/10 Aaron Morton > Thanks for the update Philip, other people have reported high await on a > single volume previously but I don’t think it’s

Re: Raid Issue on EC2 Datastax ami, 1.2.11

Thanks for the update Philip, other people have reported high await on a single volume previously but I don’t think it’s been blamed on noisy neighbours. It’s interesting that you can have noisy neighbours for IO only. Out of interest was there much steal reported in top or iostat ? Cheers --

Re: Raid Issue on EC2 Datastax ami, 1.2.11

Hi again, I have much more in formations on this case : We did further investigations on the nodes affected and did find some await problems on one of the 4 disk in raid: http://imageshack.com/a/img824/2391/s7q3.jpg Here was the iostat of the node : http://imageshack.us/a/img7/7282/qq3w.png

Raid Issue on EC2 Datastax ami, 1.2.11

Hi, We have a Cassandra cluster of 28 nodes. Each one is an EC2 m1.xLarge based on datastax AMI with 4 storage in raid0 mode. Here is the ticket we opened with amazon support : "This raid is created using the datastax public AMI : ami-b2212dc6. Sources are also available here : https://github.co