DRBD 8.3 USER GUIDE PDF
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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Please note this is option only works when the dynamic resync controller is disabled.
Manual recovery is necessary. In case your handler fails, you can resume IO with the resume-io command. Comprehensive, affordable, and easy-to-use APM and infrastructure monitoring. The dialog-refresh defines the number of seconds between updates of that countdown. In some scenarios it is preferable to allow two nodes to be primary at once; a mechanism outside of DRBD then must make sure that writes to the shared, replicated device happen in a coordinated way.
You can specify smaller or larger values. 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. If a node becomes a disconnected primary, it tries to fence the peer’s disk.
The lower-level device is detached, and the device’s disk state advances to Diskless. In most cases, block that are marked as need-to-be-resynced are in fact changed, so calculating checksums, and both reading and writing the blocks on the resync target is all effective overhead. At time of writing the only known drivers which have such a function are: By using the –allow-two-primaries option, you override this behavior and instruct DRBD to allow two primaries.
This setting has no effect with recent kernels that use explicit on-stack plugging upstream Linux kernel 2. The default value is 0, which disables this mechanism of congestion control, with a maximum of 10 GiBytes. Sets on which node the device should be promoted to primary role by the init script.
Resync operations between peers may need to wait for for these locks. In case one node did not write anything since the split brain became evident, sync from the node that wrote something to the node that did not write anything. Note the resource is data-upper uesr the –stacked option is on alpha only.
A meta-disk parameter without a disk parameter is not allowed. The use of this method can be disabled by the –no-disk-barrier option. All values have default units which might be overruled by K, M or G. This can be Default unit is sectors.
(5) — drbd-utils — Debian unstable — Debian Manpages
AF must be one of ipv4ipv6ssocks or sdp for compatibility reasons vuide is an alias for ssocks. Resync only progresses if neither the local nor the remote pause flag is set.
By completing these requests, we allow the upper layers to re-use the associated data pages. The time the peer has time to answer to a keep-alive packet. The timeout is specified in seconds. The default value is ms, the default unit are tenths of a second.
Default unit is sectors. We detect split-brain scenarios when two nodes connect; split-brain decisions are always between two nodes. The fence-peer handler is supposed to reach the peer over an alternative communication path and call ‘ drbdadm outdate minor ‘ there. The default unit is bytes. You only should use this option if you use a shared storage file system on top of DRBD. We recommend not to share metadata devices anymore, and to instead use the lvm volume manager for creating metadata devices as needed.
Ubuntu Manpage: – DRBD Configuration Files
By defining a sync-after dependency, the resynchronization of this resource will start only if the resource res-name is already in connected state i. By default this is not enabled; you must uaer this option explicitly in order to be able to use on-line device verification.
The default value of max-bio-bvecs is 0, which means that there is no user imposed limitation. This setting drdb useful for DRBD setups with low bandwidth links.
The init script drbd 8 blocks the boot process until the DRBD resources are connected. Dangerous, do not use. If both nodes became primary independently, the discard-least-changes policy is used. At the time of writing the only ones are: A node that is primary and sync-source has to schedule application IO requests and resync IO requests. You only should use this option if you use a shared storage file system on top of DRBD.
Irrespective of the auto-promote parameter, if a device is promoted explicitly drbdadm primaryit also needs to be demoted explicitly drbdadm secondary.
This setting controls what happens to IO requests on a degraded, disk less node I. Log in or Sign up.
The handler is supposed to reach the peer over an alternative communication path and call ‘ drbdadm outdate minor ‘ there.
It should be at least 5 times RTT. With this option useer can set the time between two retries.