August 1, 2019 posted by

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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If a new write request is issued before the timer expires, the timer gets reset to expiry-time. The congestion-fill parameter defines how much data is allowed to be “in flight” in this connection.

The optional name is used to refer to the connection in the system log and in other messages. Your name or email address: The receiver also logs an error when it detects a mismatch. You may list more than one host name here, in case you want to use the same parameters on several hosts you’d have to move the IP around usually.

You can find out which resync DRBD would perform by looking at the kernel’s log file. The second requires that the backing device support disk flushes called ‘force unit access’ in the drive vendors speak. Some network stacks can perform worse with this optimization. No, create an account now. The “active” disk area can be written to immediately, while “inactive” disk areas must be “activated” first, which requires a meta-data write.



You want to increase max-buffers if you cannot saturate the IO backend on the receiving side. All resources inherit the options set in this section.

The c-delay-target parameter should be set to five times the network round-trip time or more. In addition, any section can be prefixed with the keyword skipwhich causes the section and any sub-sections to be ignored. It can be set to any of the kernel’s data digest algorithms.

Note the resource is data-upper and the –stacked option is on alpha only. It is on by default since DRBD 8. The goal is to either fill the buffers along the data path with a defined amount of data if c-fill-target is defined, or to have a defined delay along the path if c-delay-target is defined.

Ubuntu Manpage: drbdsetup – Setup tool for DRBD

Section path Parameters host name [ address [address-family] address ] [ port port-number ] Defines an endpoint for a connection. The c-plan-ahead parameter defines how fast drbd adapts to changes in the resync speed. The connection between the hosts uses protocol C.

I tried this way, but failed: Timeouts are specified in units of 0. The helper program is expected to reboot the machine, which brings the node into a secondary role. Note that peer authentication is disabled as long as no cram-hmac-alg see above is specified.

The handler should not use the same communication path that DRBD uses for talking to the peer. Or double faults have led to strange UUID sets. Please participate in DRBD’s online usage counter [2]. The node is currently primary, but DRBD’s algorithm thinks that it should become sync target. The available congestion policies are block the default and pull-ahead.


Usually this should be left at its default. Since DRBD 9, the auto-promote parameter allows to automatically promote a resource to primary role when one of its devices is mounted or opened for writing.

DRBD can ensure the data integrity of the user’s data on the network by comparing hash values. But a large part of those will actually be still in sync, therefore using csums-alg will lower the required bandwidth in exchange for CPU cycles.

Drbd-documentation – Free Software Directory

In case it decides the current secondary has the right data, call the pri-lost-after-sb on the current primary. In case you do not have any automatic useer policies selected, the nodes refuse to connect. A resync process sends all marked data blocks from the source to the destination node, as long as no csums-alg is given. Only do this if you know that the new storage was initialized to the same content by other means. If the metadata device is bigger than that, the extra space is not used.

The latest version can always be obtained at http: Auto sync from the node that was primary before the split-brain situation happened. Always take the decision of the after-sb-0pri algorithm, even if that causes an erratic change of the primary’s view of the data.