Linux, programming and more
In the last time I get a lot questions and feedback to some older posts (Active/Passive Cluster) where I used DRBD. And actually I never wrote how to setup DRBD and I try to fill this gap now. Also this post will be a new ground for some new ideas and posts related to Active/Passive Clustering with KVM.
DRBD (Distributed Replicated Block Device) is a really cool cluster solution to have radundant data on two or more nodes. Everybody know RAID, DRBD is like RAID 1 over network.
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The default sync rate is normally defined in your drbd configuration (mostly /etc/drbd.conf)
1 2 3 | syncer { rate 100M; } |
If you are setting up a virtual machine on drbd cluster you need to produce more I/O and your physical machines are under heavy load. You can stop some services or you can reduce the sync rate.
Set temporary sync rate:
You need to issue this command only on one of your nodes!
1 | root@drbd-node1:~# drbdsetup /dev/drbd0 syncer -r 10M |
Enjoy the easy solution;)