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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DRBD Third Node Replication With Debian Etch

In case both have written something this policy disconnects the nodes. If you use this option with any other file system, you are going to crash your nodes and to corrupt your data! If both nodes wrote data, disconnect. Since DRBD 9, gide auto-promote parameter allows to automatically promote a resource to primary role when one of its devices is mounted or opened for writing.

We recommend not to share metadata devices anymore, and to instead use the lvm volume manager for creating metadata devices as needed. This setting is available since DRBD 8. This will speed up writes because fewer meta-data writes will be necessary, but the entire device needs to be resynchronized usdr recovery of a failed primary node. This option defines the hash algorithm being used for that purpose.

Disables the use of disk flushes and barrier BIOs when accessing the meta data device. Currently, it guidf 8. This has at least two use cases, namely to skip the initial sync, and to reduce network bandwidth when starting in a single node configuration and then later re- integrating a remote site.


vrbd This parameter usually does not need to be set, but it can be set to a value up to 10 MiB. Otherwise, mounting or opening the device fails as it already did before DRBD 9: The supported protocols are: All values have default units which might be overruled by K, M or G.

This section will only be done on alpha and bravo.


This might be used to get notified of DRBD’s state changes by piping the output to another program. The node-id parameter exists since DRBD 9. Once the file has been created, change the permissions on the file. With DRBD, we refer to the devices inside a resource as volumes. Please participate in DRBD’s online usage counter [2]. At the time of writing the only ones are: Even read-only access with tools like dumpe2fs 8 and similar is not allowed.

This section must contain a hosts parameter, which has the drbr names as arguments. When the index form of this parameter is not used, the size of the lower-level device determines the size of the metadata.

All fine works before the first restart active node.

(5) — drbd-utils — Debian unstable — Debian Manpages

If a node becomes a disconnected primary, it freezes all its IO operations and calls its fence-peer handler. Valid protocol specifiers are A, B, and C.

By using this option incorrectly, you run the risk of causing unexpected split brain. In case your handler fails, you can resume IO with the resume-io command. Still the affected node has to be rebooted “soon”.

A low value causes increased network traffic; a high value causes less network traffic but higher memory consumption on secondary nodes and higher resync times between the secondary nodes after primary node failures.


Options can be overridden in a more specific resourceconnectiononor volume section.

By default, csums-alg is unset. In case your backing storage device has battery-backed write cache you may go with option 3.

If a data vuide error is detected, DRBD will close the network connection and reconnect, which will trigger a resync. That was the only implementation before 8. See the notes on no-disk-flushes.

Valid fencing policies are: The default unit is tenths of a second, the default value is 0 which causes DRBD to use the value of ping-timeout instead. The third method is simply to let write requests drain before write requests of a new reordering domain are issued.

The default value is 10 seconds, the unit is 1 second. IO is resumed as soon as the situation is resolved. Please see this page for more information:. For ipv6the address is enclosed in brackets and uses IPv6 address notation for example, [fd The fence-peer handler is supposed to reach the peer over an alternative communication path and call ‘ drbdadm outdate minor ‘ there. A virtual IP is needed for the third node to connect to, for this we will set up a simple Heartbeat v1 configuration.

See the net command. Some parameter values have a default scale which applies when a plain number is specified for example Kilo, or times the numeric value.