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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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. This must be lower than connect-int and ping-int. Uxer also refer to this active disk area as the “activity log”. The handler is expected to reboot the machine, which puts it into secondary role. A resync process sends all marked data blocks from the source to the destination node, as long as no csums-alg is given.
The node should be abandoned. Once the file has been created, change the permissions on the file. On those kernels, the unplug-watermark parameter defines how many requests must be queued until a secondary node starts processing them.
See the notes on no-disk-flushes. The node-id parameter exists since DRBD 9. The HMAC algorithm will be used for the challenge response authentication of the peer. For all address drbx except ipv6the address is specified in IPV4 address notation for example, 1.
Note the resource is data-upper and the –stacked option is on alpha only. See the notes on –no-disk-flushes.
The disk state advances to diskless, as soon as guire backing block device has finished all IO requests. This option is available since 8. In case a primary node leaves the cluster unexpectedly, the guude covered by the active set must be resynced upon rejoining of the failed node. Peer authentication also requires the cram-hmac-alg parameter to be set. The default value for peer-ack-window is 2 MiB, the default unit is sectors.
The bitmaps are used for tracking the differences between the local and peer device: By “aborting”, basically faking a local error-completion, we allow for a more graceful swichover by cleanly migrating services.
Still the affected node has to be rebooted “soon”.
(5) — drbd-utils — Debian unstable — Debian Manpages
This parameter allows to avoid that. If a node becomes a disconnected primary, it freezes all its IO operations and calls its fence-peer handler. guive
This section is a shortcut to define many connections which share the same network options. The primary node then sets the connection to this gude node to Standalone. Peer nodes need to wait until they receive an peer-ack for releasing a lock on an AL-extent. Resync operations between peers may need to wait for for these locks.
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.
This allows drbe avoid repeating identical options for each resource, connection, or volume. This section will only be done on alpha and bravo.
Sets on which node the device should be promoted to primary role by the init script. Typically set to the same as –max-buffersor the allowed maximum. Only a single handler can be defined for each event; if no handler is defined, nothing will happen. CPU numbers in cpu-mask which do not exist in the system are ignored. This is done by calling the fence-peer handler. Note that peer authentication is disabled as long as no cram-hmac-alg see above is specified.
In case your backing storage device has a volatile write cache plain disks, RAID of plain disks you should use one of the first two.
Ubuntu Manpage: drbdsetup – Setup tool for DRBD
By using this option incorrectly, you run the risk of causing unexpected split brain. Each name refers to an on section in a resource. The port that is defined in the on section will be used.
Each host statement refers to an on section in a resource. In this vrbd you can define handlers executables that are started by the DRBD system in response to certain events. By fencing we understand preventive measures to avoid situations where both nodes are primary and disconnected AKA split brain. In case it decides the current secondary has the right data, accept a possible instantaneous change of the primary’s data.
The results are available on the web page for anyone to see. This parameter may influence resync behavior on remote nodes. The c-plan-ahead parameter defines how fast drbd adapts to changes in the resync speed.
Common options All drbdsetup sub-commands accept these two options –create-device In case the specified DRBD device minor number does not exist yet, create it implicitly.