kermat
commented
1 year ago Hello @ghevge
For discussions like this I would direct you to join the LINBIT Slack community where users of DRBD might be able to further assist you with general use case type questions.
This topic, however, is briefly covered in the DRBD User's Guide here. I can also tell you that running multiple primary nodes "permanently" isn't supported unless you promote exactly two-nodes, have proper node level fencing configured, and are using a cluster aware filesystem (like GFS2) on top of DRBD. Doing any of this incorrectly will lead to divergent datasets and split-brains.
Like the User's Guide mentions, temporary promotion of two DRBD peers for VM migration is safe and supported without node level fencing or a cluster aware filesystem.
Again, more than happy to continue the discussion in the LINBIT Slack community.
How can I enable primary mode on more than 2 nodes at the same time ?
In my case what I want to achieve, is a network distributed volumen that will be shared in between multiple active servers (and this without involving a NAS / SAN systems). The purpose of this volume is to share data in between servers in a HA way.
Is there a way to set as primary all the available nodes so that they all be able to mount the shared drive and modify / read its content at the same time ?