5
votes
4answers
4k views

High iowait on Amazon EC2 MySQL instance with EBS volume

We have a MySQL server running on an Amazon EC2 c1.medium instance relying on a single EBS volume using the ext3 filesystem for storage. This MySQL server is queried ~500/ps by several applications ...
0
votes
3answers
551 views

JVM hangs with 100 IO wait on Ubuntu Maverick (AWS EC2 xlarge instance)

Asked this question on on stackoverflow, reposting: Have an xlarge instance in AWS running 9 Tomcats with heaps from 256M to 4G. With Ubuntu 10.04 the box sporadically hangs for a few hours with huge ...
3
votes
2answers
7k views

is CPU actually occupied during iowait (%wa in top) on Linux / EC2?

On an 8-way Amazon EC2 instance (running Linux 2.6.21) with 8 EBS volumes and a lot of disk traffic, we see high %wa in top (30-40%), and high load average (8-9). My understanding is that processes ...