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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The activity log saves meta-data writes, but the whole log must be resynced upon recovery of a failed node. Only a single handler can be defined for each event; if no handler is defined, nothing will happen.
A low value causes increased network traffic; a high value causes less network traffic but higher memory consumption on secondary nodes and higher resync uesr between the secondary nodes after primary node failures.
CPU numbers in cpu-mask which do not exist in the system are ignored. The default size is 0, i.
On each host, the port numbers must be unique for each address; ports cannot be shared. Second, the online verification mechanism drbdadm verify and the verify-alg parameter allows to check for differences in the on-disk data.
This is the default policy. If you need to use the device before it was ever connected to its peer, use this option to pass the size of the DRBD device to the driver. Each extent marks 4M of the backing storage.
The timeout value must be lower than connect-int and lower than ping-int. Reduce your monitoring cost, not your coverage. With a more useg cluster manager such as Pacemaker, it makes more sense to let the cluster manager control DRBD resources.
Configuration for DRBD is done via the drbd. Installing The Source Section 2: For uswr stacked DRBD setup 3 or 4 nodesa stacked-on-top-of is used instead of an on section. Internal means that the last part of the backing device is used to store the meta-data. More recent kernels handle plugging and unplugging implicitly; on those kernels, this parameter has no effect.
The node should be abandoned. Sets the cpu-affinity-mask for DRBD’s kernel threads of this device.
The host-name argument must match the Linux host name uname -n. Still the affected node has to be rebooted “soon”. On a disconnected Primary device, this will set all bits in the out of sync bitmap. Yes, my password is: You can specify smaller or larger values.
(5) — drbd-utils — Debian jessie-backports — Debian Manpages
For all address families except ipv6the address is specified in IPV4 address notation for example, 1. This value must be given in hexadecimal notation. If you set this smaller than 10, you might decrease your performance. The results are available on the web guidw for anyone to see. As a remedy, the writing node occasionally sends peer-ack packets to its peers which tell them which state they are in relative to each other.
To disable this feature, you should explicitly set it to 0; defaults may change between versions. Otherwise, mounting or opening the device fails as it already did before DRBD 9: At time of writing the only known drivers which have such a function are: While disconnect speaks for itself, with the call-pri-lost setting the pri-lost handler is called which is expected to either change the role of the node to secondary, or remove the node from the cluster.
A yuide section inside a resource or on section applies to all volumes of that resource, and a net section inside a resource section applies to all connections of that resource. As a consequence it should give up its primary role. Some storage controllers perform best when unplug-watermark is set to the same value as max-buffers ; others are more efficient with guidf values.
The data structure is stored in the meta-data area, therefore each change of the active set is a write operation to the meta-data device.