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 port number is defined, this endpoint will use the specified port instead of the port defined in huide on section. Regardless of whether you use the meta-disk or the flexible-meta-disk keyword, it will always be of the size needed for the remaining storage size.

A resync process sends all marked data blocks from the source to the destination node, as long as no csums-alg is given. DRBD can ensure the data integrity of the user’s data on the network by comparing hash values. Also see the notes on data integrity below. Call the “pri-lost” helper program on one of the machines. It should use other communication paths than DRBD’s network link.

The default value is 10 seconds, with a minimum of 1 and a maximum of seconds.

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

Take the copy of the current active server. The sync source compares this hash with its own version of the data.


The handler is supposed to reach the peer over an alternative communication path and call ‘ drbdadm outdate minor ‘ there. The HMAC algorithm usef be used for the challenge response authentication of the peer.

CPU numbers in cpu-mask which do not exist in the system are ignored. Typically set to the same as –max-epoch-size. You only should use this option if you use a shared storage file system on top of DRBD. The node is currently primary, but lost the after-split-brain auto recovery procedure. The fourth method is to not express write-after-write dependencies to the backing store at all, by also specifying no-disk-drain. This section is very similar to the on section. See the notes on –no-disk-flushes.

You want to increase max-buffers if you cannot saturate the IO backend on ussr receiving side.

The common section might have a startupa syncera handlersa net and a disk section. It turned out that there is at least one network stack that performs worse when one uses this hinting method.

If port is omitted, is used as default. This setting is available since DRBD 8. Dangerous, do not use. To disable this feature, you should explicitly set it to 0; defaults may change between versions.

The port is always specified as a decimal number from 1 to It can be set to any of the kernel’s data digest algorithms. If the metadata device is bigger than that, the extra space is not used.


Usually this should be left at its default. This can be used to skip the initial sync, if you want to start from scratch.


DRBD consists of low-level user-space components which interact with the kernel and perform basic operations drbdsetupdrbdmetaa high-level user-space component which understands and processes the DRBD configuration and translates it into basic operations of the low-level components drbdadmand a kernel uesr. Configuration for DRBD is guid via the drbd. On large devices, the fine grained dirty-bitmap can become large as well, and the bitmap exchange can take quite some time on low-bandwidth links.

The maximum bandwidth is limited by the c-max-rate parameter. Discard the version of the secondary if the outcome of the after-sb-0pri algorithm would also destroy the current secondary’s drd. Do not use no-disk-drain.

This handler can alert someone in all cases of split brain, not just those that go unresolved. Call the “pri-lost-after-sb” helper program on one of the machines.

This program is expected to reboot the machine, i. If the decision is to discard the data on the primary node, call the pri-lost-after-sb handler on the primary node. The –assume-peer-has-space allows you to resize a device which is currently not connected to the peer.