DRBD (or Distributed Replicated Block Device) is a network block device that provides reliability when storing data across multiple network nodes.
From the kernel documentation:
DRBD is a shared-nothing, synchronously replicated block device. It is designed to serve as a building block for high availability clusters and in this context, is a "drop-in" replacement for shared storage. Simplistically, you could see it as a network RAID 1.
|udev||No||Enable sys-fs/udev integration (device discovery, power and storage device support, etc)|
|bash-completion||No||Enable bash-completion support|
|heartbeat||No||Enable Heartbeat integration|
|pacemaker||No||Enable Pacemaker integration|
|xen||No||Enable Xen integration|
This package installs the userland utilities to interact with, and control DRBD.
aka 'drbdsetup' and 'drbdadm'
"ERROR: unknown cs for drbd0 : BrokenPipe, Update/DUnknown"
This error means connection state has a problem, link needs fixing, or drbd version updating. Upstream states "we had some issues with discarding the first successful connection and getting in a connect/brokenpipe loop."
Run this command to extract useful information.