LINBIT DRBD (historical). Contribute to LINBIT/drbd development by creating an account on GitHub. Simply recreate the metadata for the new devices on server0, and bring them up: # drbdadm create-md all # drbdadm up all. You should then. DRBD Third Node Replication With Debian Etch The recent release of DRBD now includes The Third Node feature as a freely available component.

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This setting controls what happens to IO requests on a degraded, disk less node I.

Sign up or log in Sign up using Google. It turned out that there is at least one network stack that performs worse when one uses drbc hinting method.

The default is disconnect. Drhd setting has no effect with recent kernels that use explicit on-stack plugging upstream Linux kernel 2. Heartbeat Configuration Section 3: Use this option to manually recover from a split-brain situation.

The second requires that the backing device support disk flushes called ‘force unit access’ in the drive vendors speak. Discard the version of the secondary if the outcome of the after-sb-0pri algorithm would also destroy the current secondary’s data.

See how your visitors are really using your website. 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.

By using this option incorrectly, you run the risk of causing unexpected split brain. Please participate in DRBD’s online usage counter [2]. We track the disk IO rate caused by the resync, so we can detect non-resync IO on the lower level device.

(5) — drbd-utils — Debian unstable — Debian Manpages

A node that is primary and sync-source has to schedule application IO requests and resync IO requests. The most convenient way to do so is to set this option to yes. Drbe Required, but never shown. This setting controls what happens to IO requests on a degraded, disk less node I. Always honor the outcome of the after-sb-0pri algorithm. You don’t have to stop the DRBD service on server0.


DRBD can ensure the data integrity of the user’s data on the network by comparing hash values. Dangerous, do not use. Simply recreate the metadata for the new devices on server0and bring them up: DRDB config on server0: You can disable the IP verification with this option. Auto sync from the node that was primary before the split-brain situation occurred.

I need to replace a DRBD backend disk due to worn out but unsure how to proceed. When this option is not set the devices stay in secondary role on both nodes. Valid protocol specifiers are A, B, and C.

Discard the version of the secondary if the outcome of the after-sb-0pri algorithm would also destroy the current secondary’s data. Server0 is the one affected, DRBD process has been stopped on it. Call the “pri-lost-after-sb” helper program on one of the machines.

Only do that if the peer of the stacked resource is usually not available or will usually not become primary. You only should use this option if you use a shared storage file system on top of DRBD. I tried this way, but failed: The use of this method can be disabled using the no-disk-flushes option.

Auto sync from the node that touched more blocks during the split brain situation. The use of this method can be disabled by the no-disk-barrier option. The node-name might either be a host name or the keyword both.

Yes, my password is: You need to specify the HMAC algorithm to enable peer authentication at all. 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.


The default size is 0, i. When one is specified the resync process exchanges hash values of all marked blocks first, and sends only those data blocks that have different hash values.

drbd-8.3 man page

IO is resumed as soon as the drbbd is resolved. This is a debugging aid that displays the content of all received netlink messages. They will both agree upon a size when they first connect, which will be the size of the smallest disk. The first requires that drbr driver of the backing storage device support barriers called ‘tagged command queuing’ in SCSI and ‘native command queuing’ in SATA speak.

This section will only be done on alpha and bravo. If you had reached some stop-sector before, and you do not specify an explicit start-sector, verify should resume from the previous stop-sector.

After the data sync has finished, create the meta-data on data-upper on alphafollowed by foxtrot. At the time of writing the only known drivers which have such a function are: In case none wrote anything this policy uses a random decision to perform a “resync” of 0 blocks.

As a consequence detaching from a frozen backing block device never terminates. By default this is not enabled; you must set this option explicitly in order to be able to use on-line device verification.

A resync process sends all marked data blocks from the source to the destination node, as long as no csums-alg is given.