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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Dangerous, do not use. The fourth method is to not express write-after-write dependencies to the vrbd store at all, by also specifying no-disk-drain.

The verify-alg parameter determines which algorithm to use for these checksums. If af is omitted ipv4 gets used. That was the only implementation before 8. You can specify smaller or larger values. The feature only gets active if the backing block device reads back zeroes after a discard command.

The necessary steps on the current active server are: Discard the version of the secondary if the outcome of the after-sb-0pri algorithm would also destroy the current secondary’s data.

Larger values are appropriate for reasonable write throughput with protocol A over high latency networks. Do you already have an account? Usually wfc-timeout and degr-wfc-timeout are ignored for stacked devices, instead twice the amount of connect-int is used for the connection timeouts.


This option is available since DRBD 8. Please refer to drbdsetup 8 for detailed description of the parameters.

DRBD Third Node Replication With Debian Etch

Yes, my password is: May be up to 64 characters. This parameter defines if a cluster node participates in the usage counter; the supported values are yesnoand ask ask the user, the default.

If a node becomes a disconnected primary, it freezes all its IO operations and calls its fence-peer handler. As a side affect this suspends updates to the on disk activity log. Also, while resynchronizing, peer nodes will become inconsistent. With this option you can set the time between two retries.

There is at least one network stack that performs worse when one uses this hinting method. Resync operations between peers may need to wait for for these locks. If the metadata device is bigger than that, the extra space is not used.

This command will fail if the device is userr either part of a connected device pair, or disconnected Secondary. To actually do online growing you need to extend the backing storages on both devices and call the resize command on one of your nodes.

Values below 32K do not make sense. Data written to the device in primary role are mirrored to the device in secondary role.


So do not leave out the mkfs or equivalent. To ensure a 8.33 operation of the application on top of DRBD, it is possible to limit the bandwidth which may be used by background synchronizations.


You are strongly encouraged to use peer authentication. DRBD supports the following fencing policies: A resync process sends all marked data blocks userr the source to the destination node, as long as no csums-alg is given. Resync only progresses if neither the local nor the remote pause flag is set. Unfortunately device mapper LVM might not support barriers.

Installing The Source Section 2: It can be set to any of the kernel’s data digest algorithms.

If you want to not throttle at all, set it to zero, if you want to throttle always, set it to one. Heartbeat Configuration Section 3: See the notes on no-disk-flushes.

If both nodes became primary independently, the discard-least-changes policy is used. Such default scales can be overridden by using a suffix for example, M for Mega. Auto sync uzer the node that became primary as second during the split-brain situation.

Heartbeat will not start if this step is not followed. Usually this should be left at its default.