Removing DRBD Devices and Volumes from Highly Available NFS

In working through attempting to add a new volume without causing an outage with a highly available NFS setup I had to come up with a methodology to remove the DRBD device to effectively rinse and repeat until we came up with the right steps. Below outlines the steps to remove a DRBD block device/volume.

Remove Block Device on Secondary Node

Note: It is necessary to remove the block device on the Secondary Node first so you must use “drbdadm status” to find that node.

drbdsetup detach /dev/drbd1 
drbdsetup del-minor /dev/drbd1 

Remove Volume/Device entry from /etc/drbd.d/nfs.res

volume 1 {         
    device    /dev/drbd1;
    disk      /dev/sdc1; 
    meta-disk internal;  
} 

Move Primary DRBD/NFS functions to Secondary Node

pcs resource move --master ms_drbd_nfs nfs2.hdp.senia.org 

Remove Volume Device from node that was Primary Node that is now Secondary Node

drbdsetup detach /dev/drbd1 
drbdsetup del-minor /dev/drbd1 

Remove Volume/Device entry from /etc/drbd.d/nfs.res

Move Primary Node back to original server

volume 1 {         
    device    /dev/drbd1;
    disk      /dev/sdc1; 
    meta-disk internal;  
} 

pcs resource move --master ms_drbd_nfs nfs1.hdp.senia.org