DRBD 8.3 USER GUIDE PDF

The guide is constantly being updated. This guide assumes, throughout, that you are using DRBD version 8. If you are using a pre Please use the drbd-user mailing list to submit comments.

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Sasar Default unit is sectors. DRBD will use the first method that is supported by the backing storage device and that is not disabled drbr the user. While probably harmless for most use cases fstrim on guids file systemDRBD cannot have that. If both nodes became primary independently, the discard-least-changes policy is used. You may also specify a unit explicitly.

This option defines the hash algorithm being used for that purpose. The difference to the on section is that the matching of the host sections to machines is done by the IP-address instead of the node name.

This can result in data loss or corruption. On large devices, the fine grained dirty-bitmap can become large as well, and the bitmap exchange can take quite some time on low-bandwidth links. Section on Parameters address [address-family] address: Manual recovery is necessary.

The value is constrained by the discard granularity of the backing block device. This section will only be done on alpha and bravo. You want to increase max-buffers if you dbd saturate the IO backend on the receiving side. Or double faults led to strange UUID sets. The available policies are io-error and suspend-io. The use of this method can be disabled using the no-disk-flushes option. Usually one delegates the role assignment to a cluster manager e.

A higher number of extents gives longer resync times but less updates to the meta-data. We detect split-brain scenarios gyide two nodes connect, so split-brain decisions are always among two nodes.

We recommend not to share metadata devices anymore, and to instead use the lvm volume manager for creating metadata devices as needed. On both nodes, initialize meta data and configure the device. During that resync the peer node will have an inconsistent disk. Defines all nodes of a mesh. This setting is available since DRBD 8. To disable this feature, you should explicitly set yuide to 0; defaults may change between versions.

While disconnect speaks debd 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. Drbd-documentation — Free Software Directory This does not always indicate a problem: To avoid possible distributed deadlocks on congestion, this setting is used as a throttle threshold rather than a hard limit.

That means it will slow down the application that generates the write requests that cause DRBD to send more data down that TCP connection. This setting controls what happens to IO requests on a degraded, disk gguide node I. TOP 10 Related.

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The unit is seconds. By default this is not enabled; you must set this option explicitly in order to be able to use on-line device verification. 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. Auto sync from the node that was primary before the split-brain situation happened. Take the copy of the current active server. Bitmaps of very large devices are also relatively large, but they usually compress very well using run-length encoding. In case you do not have any automatic after-split-brain policies selected, the nodes refuse to connect.

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DRBD 8.3 USER GUIDE PDF

Sasar Default unit is sectors. DRBD will use the first method that is supported by the backing storage device and that is not disabled drbr the user. While probably harmless for most use cases fstrim on guids file systemDRBD cannot have that. If both nodes became primary independently, the discard-least-changes policy is used.

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Manos When selecting the method you should not only base your decision on the measurable performance. Internal means that the last part of the backing device is used to store the meta-data. A resync process sends all marked data blocks from the source to the destination node, as long as no csums-alg is given. This setting is available since DRBD 8. The node-id parameter exists since DRBD 9. With giude option you request that the automatic after-split-brain policies are used as long as the data sets of the nodes are somehow related. The default value is 1; a value of 0 turns off the countdown.

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