This guide has been released to the DRBD community, and its authors The DRBD User’s Guide v. Pacemaker CRM configuration. This document will cover the basics of setting up a third node on a standard Debian Etch installation. At the end of this tutorial you will have a DRBD device that. There may be multiple resource sections in a single file. For more examples, please have a look at the DRBD User’s Guide[1].

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That means it will slow down the application that generates dtbd write requests that cause DRBD to send more data dbrd that TCP connection. Other supported address families are ipv6ssocks for Dolphin Interconnect Solutions’ “super sockets” and sdp for Sockets Direct Protocol Infiniband.

Some parameter values have a default scale which applies when a plain number is specified for example Kilo, or times the numeric value. Larger values are appropriate for reasonable write throughput with protocol A over high latency networks.

If the address parameter is not provided, no connections to peers will be created by default. The fence-peer handler is supposed to reach the peer over an alternative communication path and call ‘ drbdadm outdate minor ‘ there.

Never access such a device while DRBD is running on top of it. The second requires that the backing device support disk flushes called ‘force unit access’ in the drive vendors speak.

A value of 0 the default causes the buffer size to adjust dynamically. As a remedy, the writing node occasionally sends peer-ack packets to its peers which tell them which state they are in relative to each other. Get your subscription here. This handler can be used for removing the snapshot created in the before-resync-target handler. Therefore most distributions install helpers for virtual linux machines will end up with missaligned partitions.


Usually contains or inherits at least one volume section. For example, in a three-node setup nodes A, B, C each with a single device, every node maintains one bitmap for each of its peers.


See the disk-flushes parameter. Note the resource is data-upper and the drrbd option is on alpha only. Manual recovery is necessary. In case it decides the current secondary drrbd the right data, it calls the “pri-lost-after-sb” guiide on the current primary. By default, csums-alg is unset. Currently only minor-countdialog-refreshdisable-ip-verification and usage-count are allowed here. You can disable the IP verification with this option. Heartbeat Configuration Section 3: On a disconnected Primary device, this will set all bits in the out of sync bitmap.

The default value for peer-ack-window is 2 MiB, the default unit is sectors. The c-delay-target parameter should be set to five times the network round-trip time or more.

In case it decides the current secondary has the right data, call the pri-lost-after-sb on the current primary. This is the device that applications are supposed to guise in most cases, the device is not used directly, but as a file system. Default unit is sectors. This is the default policy. The timeout is specified in seconds. Generate a new current-uuid and clear the dirty bitmap.

That means it will slow down the application that generates the write requests that cause DRBD to send more data down that TCP connection. After the data sync has finished, create the meta-data on data-upper on alphafollowed by foxtrot. All nodes must be directly connected. If on-line verification is already in progress and this node is “VerifyS”frbd command silently “succeeds”.


If a port number is defined, this endpoint will use the specified port instead of the port defined in the on section. The defined policies are: By fencing we understand preventive measures to avoid situations where both nodes are primary and disconnected AKA split brain.

At time of writing the only known drivers which have such a function are: Which machine runs the helper program is determined by the after-sb-0pri strategy. The receiver also logs an error when it detects a mismatch.

Drbd-documentation – Free Software Directory

This means that the device is detached from its backing storage device. The kser has no device to read from or to write to.

The most convenient way to do so is to set this option to yes. Normally the automatic after-split-brain policies are only used if current states of the UUIDs do not indicate drbs presence of a third node.

The handler should not use the same communication path that DRBD uses for talking to the peer. Before DRBD 9, this could only be done explicitly “drbdadm primary”. This section is used to fine tune DRBD’s properties. Resync operations between peers may need to wait for for these locks.

From these three methods, drbd will use the first that is drbe and supported by the backing storage device. Unfortunately device mapper LVM might not support barriers.