Amazon EC2 EBS gp3 vs io2 read and write times comparison

When comparing Amazon EC2’s EBS (Elastic Block Store) gp3 and io2 volumes, it’s important to consider the specific performance characteristics of each type, particularly regarding read and write times. Both are SSD-based storage options but are designed for different use cases.

PostgreSQL на XFS и ext4

Есть инстанс r3.2xlarge на амазоне. OS: Linux 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt7-1 (2015-03-01) x86_64
на нем раздел с PostgeSQL 9.4. База достаточно нагружается каждый день. нагрузка одинаковая.
cpu-pinpoint=1426407917,1427099117

Tomcat unicast cluster configuration example

We have two Amazon EC2 instances running Apache Tomcat

Tomcat Node 1: IP: 192.168.0.50
Tomcat Node 2: IP: 192.168.0.51

Basic cluster configuration was set up from Tomcat’s documentation [http://tomcat.apache.org/tomcat-7.0-doc/cluster-howto.html] and working fine on local test environment.

But Amazon AWS doesn’t support multicast traffic and there is no documentation how to set up unicast cluster.
Here is example config of unicast cluster.