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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You may also specify a unit explicitly. As a remedy, the writing node occasionally sends peer-ack packets to its peers drbr tell them which state they are in relative to each other.
The start-sector will be rounded down to a multiple of 8 sectors 4kB. Use with care, since if you do not resize the peer’s disk as well, further connect attempts of the two will fail. On the other hand A forced detach returns dgbd. The fence-peer handler is supposed to reach the peer over alternative communication paths and drbdd ‘drbdadm outdate res’ there.
The disk state advances to diskless, as soon as the backing block device has finished all IO requests.
Do not use no-disk-drain. Typically set to the same as –max-buffersor the allowed maximum. We would like to ask users to participate in the online usage counter as this provides us valuable feedback for steering the development of DRBD.
This use-case does only work on “Just Created” meta data. The size of the activity log is a major factor of how long a resync will take and how uder a replicated disk will become consistent after a crash. IO is resumed as soon as the situation is resolved. Also, while resynchronizing, peer nodes will become inconsistent. Wait for connection timeout, if the peer was outdated. You can find out which resync DRBD would perform by looking at the kernel’s log file.
This might be used to get notified of DRBD’s state changes by piping the output to another program.
Drbd-documentation – Free Software Directory
The include statement is only allowed on the top level, i. The available policies are io-error and suspend-io. Please refer to drbdsetup 8 for a detailed description of this section’s parameters. The helper program is expected to reboot the machine, which brings the node into a secondary role.
Once more than max-buffers pages are in use, further allocation from usrr pool is throttled. Please note that the usage-count is set to yeswhich means it will notify Linbit that you have installed DRBD.
Values below 32K do not make sense. Even read-only access with tools like dumpe2fs 8 and similar is jser allowed. 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.
DRBD uses this block device to actually store and retrieve the data. Heartbeat will not start if this step is not followed. Some storage controllers perform best when unplug-watermark is set to the same value as max-buffers ; others are more efficient with smaller values.
It can be set to any of the kernel’s data digest algorithms.
(5) — drbd-utils — Debian unstable — Debian Manpages
It can be set to any of the kernel’s data digest algorithms. In case it decides the current secondary has the right data, it calls the “pri-lost-after-sb” handler on the current primary. Make one side primary and create a file system. In case you want to limit the wait time, do it here.
In case none wrote anything this policy uses a random decision to perform a “resync” of 0 blocks. Wait for connection timeout. No fencing actions are done. Also see the floating section. Normally the automatic after-split-brain policies are only used if current states of the UUIDs do not indicate the presence of a third node. Additional files can be included with the include file-pattern statement see glob 7 for 8.3 expressions supported in file-pattern.
For example, in a three-node setup nodes A, B, C each with a single device, every node maintains one bitmap for each of its peers. It can be set to any of the kernel’s data digest algorithms.
In case your handler fails, you can resume IO with the usre command. They have no effect once the system is up and running. When a csums-alg algorithm is specified, when requesting a piece of out-of-sync data, the sync target also sends along a hash of the data it currently has.
On this page DRBD 8.