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Introduction to Linux Clustering
8.4.2 THREE+ NODE DISTRIBUTED CLUSTER
The two-node distributed cluster detailed above will work fine with two-nodes, but what
about when three or more nodes are required?
We want data replication between the servers, but DRBD will only work with two-nodes in
primary/primary modes. This gives us two options:
1. Run DRBD between the two main servers, and the other servers can connect to one
of the two servers via a network filesystem like NFS.
This is quite simple, but has the obvious flaw of disk I/O being limited to the speed
of the WAN connection, as well as the transfers causing data cap usage on non-
flatrate connections.
Depending on your usage and requirements, this may or may not be a problem.
2. Run a distributed file system with replication support on all the nodes.
Unfortunately there are currently no distributed filesystems available which can
provide both replication and distributed data.
Therefore, the next best solution is a using a distributed filesystem, with DRBD
underneath it to provide the redundancy.
© Copyright 2008 Jethro Carr Page 31/33
host2
host1
www.example.com
(floating A record)
smart pwr sw
sda
sda
Internet
smart pwr sw
GSM out-of-band
management
network
DRBD across VPN
remote host
for
quorum ping
- Table of Contents 1
- 1 Introduction 4
- 2 About clusters 5
- 4 Clustering fundamentals 8
- 4.2.2 FENCING 9
- 4.2.3 SPLIT-BRAIN 10
- 4.2.4 QUORUM 10
- 5.1 Redhat Cluster Suite 12
- 5.1.2 LUCI AND RICCI 13
- 5.1.3 SYSTEM-CONFIG-CLUSTER 13
- 5.1.4 LOAD BALANCING 13
- 7 Storage Management 16
- Hot Spare 17
- Replication 17
- SAN or NAS 17
- 7.2.1 ACCESSING SAN DIRECTLY 20
- 7.3 Distributed Storage 21
- 7.4 Replicated Storage 22
- 7.5 Clustered Filesystems 24
- 9 Further Reference 33
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