On 10. 03. 2015 14:52, Jeff Darcy wrote:
I wold like to setup server side quorum by using the following setup:
- 2x storage nodes (s-node-1, s-node-2)
- 1x arbiter node (s-node-3)
So the trusted storage pool has three peers.
This is my volume info:
Volume Name: wp-vol-0
Type: Replicate
Volume ID: 8808ee87-b201-474f-83ae-6f08eb259b43
Status: Started
Number of Bricks: 1 x 2 = 2
Transport-type: tcp
Bricks:
Brick1: s-node-1:/gluster/gvol0/brick0/brick
Brick2: s-node-2:/gluster/gvol0/brick0/brick
I would like to setup the server side quorum so that any two nodes would
have quorum.
s-node-1, s-node-2 = quorum
s-node-1, s-node-3 = quorum
s-node-2, s-node-3 = quorum
According to the Gluster guys at FOSDEM this should be possible.
I have been fiddling with the quorum options, but have not been able to
achieve the desired setup.
Theoretically I would do:
# gluster volume set wp-vol-0 cluster.server-quorum-type server
# gluster volume set wp-vol-0 cluster.server-quorum-ratio 60
But the cluster.server-quorum-ratio option produces an error:
volume set: failed: Not a valid option for single volume
How would I achieve the desired setup?
Somewhat counter-intuitively, server-quorum-type is a *volume* option
but server-quorum-ratio is a *cluster wide* option. Therefore, instead
of specifying a volume name on that command, use this:
# gluster volume set all cluster.server-quorum-ratio 60
Thanks for the tip. Now the volume is accessible/writable whenever 2 out
of 3 peers are connected to each other.
I have set up the folowing:
# gluster volume set wp-vol-0 cluster.server-quorum-type server
# gluster volume set all cluster.server-quorum-ratio 60
I have a follow-up question.
When a node is disconnected from the rest, the client gets an error
message "Transport endpoint is not connected" and all access is
prevented. Write access must not be allowed to such a node. I understand
that.
In my case it would be a desired feature to be able to at least read
files. Is it possible to retain read-only access?
Kind regards,
Mitja
_______________________________________________
Gluster-users mailing list
Gluster-users@xxxxxxxxxxx
http://www.gluster.org/mailman/listinfo/gluster-users
