On 2/9/2011 7:04 PM, Rajagopal Swaminathan wrote: > Greetings, > > On 2/9/11, Denis Zaharov<dizaharov at gmail.com> wrote: >> Dear mailing list members, >> >> There are two servers with CentOS 5.5 installed. >> The servers are working with Zabbix (monitoring system for traffic, >> using a MySQL), wiki and RT (all are using Apache). >> If one server will have became not available then necessary start these >> services on another server with replication of data. >> >> Can I use the Red Hat Cluster Suite for it at CentOS? > Assuming all the application uses Single instance mysql or apache > service, Yes. For multiple instances though, you need to check > further. > > You may lose a sessions during the transition, I am not too sure. > Again depends how application handles it. Don't know. > >> Also I heard about Heartbeat and DRBD. Maybe it is what I need? >> > Well, if you want HA filesystem too, then GFS on top CLVM on top of > DRBD makes sense. > > But DRBD HA should be simpler for two node. > > Adding couple of NIC and bonding them will help further the high availability > > However, ir you plan to add more nodes to this cluster, then consider > RHCS as that would supprt 16 nodes IIRC. > > And oh, RHCS requires good working fencing -- power or management port > and/or storage. Don't leave home without it! > Also remember that Zabbix will only allow you to specify ONE server address in the client config. You can use heartbeat to handle the VIP (Virtual IP) failover, drbd, mysql and apache. Ryan