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.
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See the disk-flushes parameter.
Drbd-documentation – Free Software Directory
Edit the haresources file, the IP created here will be the IP that our third node refers to. The third method is simply to let write requests drain before write requests of a new reordering domain are issued.
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.
If no address family is specified, ipv4 is assumed. Valid protocol specifiers are A, B, and C. In case a primary node leaves the cluster unexpectedly, the areas covered by the active set must be resynced upon rejoining of the failed node.
Auto sync from the node that was primary before the split-brain situation happened. Internal means that crbd last part of the backing device is used to store the meta-data.
In case both have written something this policy disconnects the nodes. The shared secret used in peer authentication. Disables the use of disk flushes and barrier BIOs when accessing the meta data uuser. 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. Each path section must contain exactly two host parameters.
In case it decides the current secondary has the right data, call the pri-lost-after-sb on the current primary.
Note that on systems which do not support disk barriers, enabling this option can lead to data loss or corruption.
Wait for uset timeout, if this node was a degraded cluster. The necessary steps on the current active server are: By setting this option you can make the init script to continue to wait even if the device pair had a split brain situation and therefore refuses to connect.
Everything enclosed by the braces is skipped. For backward compatibilty reasons, ghide because on fast links this possibly does not improve transfer time but consumes cpu cycles, this defaults to off. This section must contain a hosts parameter, which has the host names as arguments. Section net Parameters after-sb-0pri policy Define how to react if a split-brain scenario is detected ddrbd none of the two nodes is in primary role.
The default values of these parameters are: DRBD automatically performs hot area detection.
You must not use [index] with internal. A known example is: The size of the activity log is a major factor of how long a resync will take and how fast a replicated disk will become consistent after a crash.
DRBD then records the differences between itself and the peer in its bitmap, but it no longer replicates them to the peer. During online verification as initiated by the verify sub-commandrather than doing a bit-wise comparison, DRBD applies a hash function to the contents of every block being verified, and compares that hash with the peer. Second, the online verification mechanism drbdadm verify and the verify-alg parameter allows to check for differences in the on-disk data.
The node-name might either be a host name or the keyword both. In case it cannot do that, it should stonith the peer. The activity log saves meta-data writes, but the whole log must be resynced upon recovery drd a failed node. IO is resumed as soon as the situation is resolved.
Ubuntu Manpage: drbdsetup – Setup tool for DRBD
In case it decides the current secondary has the right data, it calls the “pri-lost-after-sb” handler on the current primary. DRBD has four implementations to express write-after-write dependencies to its backing storage device. The include statement is only allowed on the top level, i. Setting the size value to 0 means that the guidr should autotune this. With the stacked-timeouts keyword you disable this, and force Gyide to mind the wfc-timeout and degr-wfc-timeout statements.
If you want to not throttle at all, set it to zero, if you want to throttle always, set it to one. The default value is 0, which disables this mechanism of congestion control, with a maximum of 10 GiBytes. The most convenient way to do so is to set this option to yes.
The configuration files are designed so that each cluster node can contain an identical copy of the entire cluster configuration. This option defines the hash algorithm being used for that purpose.