I've been using RHCS to control DRBD quite happily, but only in a active/passive scenario. All it requires is a little script, and an rgmanager '<script../>' object: #!/bin/bash exec /etc/ha.d/resource.d/drbddisk <resourcename> $@ (/etc/ha.d/resource.d/drbddisk is installed by the DRBD package) Regards, Arjuna Christensen | Systems Engineer Maximum Internet Ltd DDI: + 64 9 913 9683 | Ph: +64 9 915 1825 | Fax:: +64 9 300 7227 arjuna.christensen@xxxxxxxxxxxx| www.maxnet.co.nz -----Original Message----- From: linux-cluster-bounces@xxxxxxxxxx [mailto:linux-cluster-bounces@xxxxxxxxxx] On Behalf Of Chris Picton Sent: Monday, 14 April 2008 4:43 a.m. To: linux-cluster@xxxxxxxxxx Subject: DRBD and redhat cluster Hi all I am planning a pair of machines using DRBD to export redundant block devices via gnbd I will have about 10 other machines using gfs2 to access this data. I have thought of a few different ways of accomplishing this, and would appreciate any feedback you may have. I can run the drbd exports in one of three ways: 1. Single drbd device in single master mode. The drbd primary resource, shared ip address and gndb export will fail over between the two nodes. Advantages. Simple setup Disadvantages. One machine always fairly idle 2. Two drbd devices on each server. Server1 will be primary on the one device, server 2 will be primary on the other device. As above, each drbd resource will have an associated IP address and gnbd export associated with it. These resources will fail over between the two nodes. The remaining cluster nodes will assemble these using a striped clvm. Advantages. The two nodes will be equally used. Will get double the throughput from the pair of machines (assuming high speed bonded crossover between the two). Also, will be able to add another pair of these machines later to increase bandwidth and storage space for the LVM. Disadvantages: More complex 3. A drbd device in master/master mode, exported from both via gnbd. Cluster members will access this via dm-multipath. Advantages: not sure Disadvantages: Will bandwidth be shared between the two machines? In addition to the options above, I am also wondering about the cluster software I should use. I will have to use RHCS to use gfs2 and fence_gnbd correctly, but is heartbeat a better choice than failover domains for the drbd exports? Any insight will be helpful Chris -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
