DRBD (Distributed Replicated Block Device) a low cost HA solution (alternate to SRDF)

Some of the key features

  • DRBD® refers to block devices designed as a building block to form high availability (HA) clusters. This is done by mirroring a whole block device via an assigned network. DRBD can be understood as network based raid-1
  •     DRBD® available under the terms of The GNU General Public License v2
  • Fully synchronous, memory synchronous or asynchronous modes of operation

Reference:
http://drbd.linbit.com/home/what-is-drbd/

http://drbd.linbit.com/users-guide/

http://en.wikipedia.org/wiki/Distributed_Replicated_Block_Device

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QotD#4 Why do we use cluster id in /etc/llttab file while configuring VCS llt

while configuring llt in /etc/llttab we set a unique cluster id ? What is the purpose of this setup ?

set-node north

set-cluster 2

link qfe:0 /dev/qfe:0 – ether – –

link qfe:1 /dev/qfe:1 – ether – –