VOTEQUORUM_OVERVIEW(8) Corosync Cluster Engine Programmer's Manual VOTEQUORUM_OVERVIEW(8)NAME
votequorum_overview - Votequorum Library Overview
OVERVIEW
The votequuorum library is delivered with the corosync project. It is the external interface to the vote-based quorum service. This service
is optionally loaded into all ndes in a corosync cluster to avoid split-brain situations. It does this by having a number of votes assigned
to each system in the cluster and ensuring that only when a majority of the votes are present, cluster operations are allowed to proceed.
The library provides a mechanism to:
* Query the quorum status
* Get a list of nodes known to the quorum service
* Receive notifications of quorum state changes
* Change the number of votes assigned to a node
* Change the number of expected votes for a cluster to be quorate
* Connect an additional quorum device to allow small clusters to remain quorate during node outages.
votequorum reads its configuration from the objdb. The following keys are read when it starts up:
* quorum.expected_votes
* quorum.votes
* quorum.quorumdev_poll
* quorum.disallowed
* quorum.two_node
Most of those values can be changed while corosync is running with the following exceptions: quorum.disallowed cannot be changed, and
two_node cannot be set on-the-fly, though it can be cleared. ie you can start with two nodes in the cluster and add a third without reboot-
ing all the nodes.
BUGS
This software is not yet production, so there may still be some bugs.
SEE ALSO corosync-quorumtool(8), votequorum_initialize(3), votequorum_finalize(3), votequorum_fd_get(3), votequorum_dispatch(3), votequorum_con-
text_get(3), votequorum_context_set(3),
corosync Man Page 2009-01-26 VOTEQUORUM_OVERVIEW(8)
Hi all,
I would like to ensure that a volume group has an effective quorum setting of 1 (or off). I know you can change the quorum setting using the chvg -Q command but want to know if the setting has been changed before the vg was varied on or a reboot.
In other words how can I ensure that... (3 Replies)
Hi,
I am running AIX 5.3 TL8. After a disk failure, one of my mirrored application volumegroups went down. Unfortunately we have quorum switched on on this VG and the defective disk holds the majority.
I have set MISSINGPV_VARYON to TRUE and tried a forced varyon but it's still failing. I... (3 Replies)
Hi all
Just a question about quorum.
I am running AIX 5.3
Rootvg has 2 PV - not mirrored. quorum is switched on.
What happens when one disk fails?, can i replace the disk and bring the entire VG back up. with all the data intact. knowing that the VG will be unavailable until i replace the... (3 Replies)
Hi all, i have 3 nodes cluster (Centos 5 cluster suit) with out quorum disk,
node vote = 1,
the value of a quorum = 2,
when 2 nodes going offline, cluster services are destoys.
How i can save the cluster and all services(move all services to one alive node)
with out quorum disk when other... (3 Replies)
Hi all. I have two nodes taken different places. They are connected together on a network. So, i have a service, it works on one of nodes and when the node is unavailable the service should will be launched on other node.
Solution: rhel cluster, keepalive, hearbeat...may be Carp
but what if... (2 Replies)
I read from gpfs implementation guide about node quorum with tie-breaker disks:
In my testing environment, I have 4 AIX as quorum nodes, each node connected to 3 GPFS disks. All the 3 disks are configured to be tie-breaker disks.
Then, I disconnect the network of 2 nodes, and then all gpfs file... (0 Replies)
Hi
I need to know what are the precaution we should take during quorum server reboot as this quorum server is providing quorum devices to five different solaris two node clusters.
Also let me know do I have to follow below procedure as well before and after reboot of quorum server
Do I... (3 Replies)