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1.4. Tipologia dei cluster Pacemaker

Pacemaker non fa alcuna ipotesi in merito all'ambiente operativo, questo consente di supportare praticamente qualsiasi configurazione ridondata come Active/Active, Active/Passive, N+1, N+M, N-to-1 e N-to-N.
In this document we will focus on the setup of a highly available Apache web server with an Active/Passive cluster using DRBD and Ext4 to store data. Then, we will upgrade this cluster to Active/Active using GFS2.
Two-node Active/Passive clusters using Pacemaker and DRBD are a cost-effective solution for many High Availability situations

Figura 1.4. Ridondanza Active/Passive

When shared storage is available, every node can potentially be used for failover. Pacemaker can even run multiple copies of services to spread out the workload

Figura 1.5. Ridondanza N a N