DRBD status :- UpToDate/Diskless

Question

I was configuring two DRBD shares for our servers. I have successfully completed two DRBD share creation, but while checking the status one of the shares status is showing as "UpToDate/Diskless".

drbd-overview command output

[root@server1~]#drbd-overview 

  1:drbd   Connected Secondary/Primary UpToDate/UpToDate C r---- 
  2:drbd1  Connected Primary/Secondary   UpToDate/Diskless C r----

[root@server2~]#drbd-overview

  1:drbd   Connected Primary/Secondary UpToDate/UpToDate C r---- 
  2:drbd1  Connected Secondary/Primary   Diskless/UpToDate C r---- 

The DRBD is working correctly and i can mount the devices on primary nodes.

But i am wondering about one DRBD share status. is that status is normal or is there anything wrong with that share ??

Thanks in advance.

Answer 1

This is not normal at all (everything else than UpToDate is not normal). Check if the disk you configured in the config file exists and works correctly.

From the docs:

Diskless. No local block device has been assigned to the DRBD driver. This may mean that the resource has never attached to its backing device, that it has been manually detached using drbdadm detach, or that it automatically detached after a lower-level I/O error.

Answer 2

these commands will help you fix the problem. Run the following commands on the Diskless node.

drbdadm detach
drbdadm connect
drbdadm attach
restart the drbd service <--- this is important step

Answer 3

Both nodes should be UpToDate

Look like you should attach the disk at the diskless side. Go to the secondary node and execute

drbdadm attach drbd1