Clusters

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drbd vs nbd/md drbd is more tightly integrated with the version vector; failures like splitbrain, one node rebooting etc do not occur in md scenarios Close integration with the network layer makes the protocol A and B possible, which would be rather difficult to add to nbd md+nbd is more complex to setup Possibility would be to add appropriate scripting around md+nbd to ease this, but nobody steps forward to do that ;) Lars MarowskyBrée, SUSE Labs, Nuremberg, 01.03.04, heartbeattutorial.sxi, 48 48
Further reading In search of clusters by Gregory F. Pfister Blueprints in High Availability by Evan Marcus, Hal Stern Fault tolerance in Distributed Systems by Pankaj Jalote Distributed Algorithms by Nancy Lynch Transaction Processing by Jim Gray http://www.lcic.org/ for more links to projects http://linuxha.trick.ca/ Linux HA Wiki http://linuxha.org/ Lars MarowskyBrée, SUSE Labs, Nuremberg, 01.03.04, heartbeattutorial.sxi, 49 49
Page 1 and 2: Challenging the world to change Lar
Page 3 and 4: Introduction Overview and concepts
Page 5 and 6: High Availability debuzzed Faults w
Page 7 and 8: The pyramid Cost Potential market s
Page 9 and 10: Reduce MTTR Introduce redundancy an
Page 11 and 12: Clusters A cluster groups resources
Page 13 and 14: Distributed Systems A number of nod
Page 15 and 16: Messaging in clusters Messages are
Page 17 and 18: Resource Management Resource: Encap
Page 19 and 20: Accessing the data Shared storage v
Page 21 and 22: Kinds of failover systems Cold Hard
Page 23 and 24: heartbeat overview I Started by Ala
Page 25 and 26: heartbeat limitations Resource mana
Page 27 and 28: Resource Agents Allow heartbeat to
Page 29 and 30: STONITH modules Network power switc
Page 31 and 32: Cluster Test System CTS is the hear
Page 33 and 34: Common mistakes Not having the conf
Page 35 and 36: drbd illustrated Lars MarowskyBr
Page 37 and 38: ha.cf example keepalive 200ms warnt
Page 39 and 40: drbd.conf resource drbd0 { protocol
Page 41 and 42: Other projects Other failover softw
Page 43 and 44: Cluster Volume Manager LVM2: Propri
Page 45 and 46: Cluster Alias Load balancing withou
Page 47: Software RAID md codebase in 2.4 su

Clusters

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