Astaro Deployment Guide
High Availability Options
© 2011 Astaro GmbH & Co. KG – a Sophos company. Subject to change without notice.
10
Performance Improvements
One of the main benefits of clustering Astaro gateways are the scalability and performance improvements you
can achieve. By simply adding additional nodes to an existing cluster, adding hardware resources to an existing
environment is no longer a major configuration effort. In a cluster you can add up to 10 nodes on the fly, nearly
linearly increasing the performance of the overall system.
The matrix below shows how additional nodes increase overall performance in a cluster. Note, that between
three and four nodes the performance increase is lower due to the fact that with adding the 4
th
node, the
master node will be dedicated to handle load balancing and synchronization tasks, leaving the workload to the
slave and worker nodes. Also, in sizing your clustered environment you have to observe a 1 Gbps limit of the
HA interface for the sum of all balanced network traffic (IPSec, IPS, FTP, HTTP, POP3 und SMTP).
Performance Progression within an Astaro Cluster
0%
100%
200%
300%
400%
500%
600%
700%
800%
900%
1
2
3
4
5
6
7
8
9
10
C
lu
ster
Pe
rf
o
rm
an
ce
Number of Nodes
