Unable to find a logging volume with enough free space

Hi There - ive been provisioning storage to the vplex with no issue for some time now.  However fulfilling a project request of

4 x 1.5TB luns and 4 x 250GB Luns when creating the distributed devices the smaller 250GB work fine.  but 3 of the 4 1.5 TB fail with the following error:

"unable to attach mirror "device_1" to device 'clusters/cluster-1/devices/device_device_MIRROR'.   unable to attach 'device_1' to device 'device_1_MIRROR'. 

Unable to find a logging volume at "cluster1" with enough free space to create logging segments for distributed device

please see attached picture containing the error message.

any help would be appreciated.

FYI i do understand that best practice dictates that there should be a 10GB logging vol for every ¬320TB of data.  and have read the following:

Tech Tip: Logging Volume Considerations

however as i inherited this system im unsure of the setup or how easy it would be to create another logging volume or whether there is a way to find out if it is full etc...

thanks in advance