XSAN 4 cannot create affinity

When trying to assign an affinity to a folder, I get this error:

ns:~ cine$ sudo cvaffinity -s Data /Volumes/XRAID/COMMON

cvaffinity: Couldn't set affinity for "/Volumes/XRAID/COMMON" - error 2

ns:~ cine$

The info from cvadmin here:
Xsanadmin (XRAID) > show long
Show stripe groups (File System "XRAID")

Stripe Group 0 [MetadataAndJournal] Status:Up,MetaData,Journal,Exclusive
Total Blocks:61035712 (931.33 GB) Reserved:0 (0.00 B) Free:61014147 (931.00 GB) (99%)
MultiPath Method:Rotate
Stripe Depth:1 Stripe Breadth:64 blocks (1024.00 KB)
Realtime limit IO/sec:0 (~0 mb/sec) Non-Realtime reserve IO/sec:0
Committed RTIO/sec:0 Non-RTIO clients:0 Non-RTIO hint IO/sec:0
Disk stripes:
Primary Stripe [MetadataAndJournal] Read:Enabled Write:Enabled
Node 0 [METADATA_LUN]

Stripe Group 1 [Data] Status:Up
Total Blocks:488290432 (7.28 TB) Reserved:270720 (4.13 GB) Free:488019682 (7.27 TB) (99%)
MultiPath Method:Rotate
Stripe Depth:1 Stripe Breadth:64 blocks (1024.00 KB)
Realtime limit IO/sec:0 (~0 mb/sec) Non-Realtime reserve IO/sec:0
Committed RTIO/sec:0 Non-RTIO clients:0 Non-RTIO hint IO/sec:0
Disk stripes:
Primary Stripe [Data] Read:Enabled Write:Enabled
Node 0 [DATA_LUN]

Stripe Group 2 [Video] Status:Up
Total Blocks:1708982848 (25.47 TB) Reserved:270720 (4.13 GB) Free:1708712097 (25.46 TB) (99%)
MultiPath Method:Rotate
Stripe Depth:2 Stripe Breadth:32 blocks (512.00 KB)
Realtime limit IO/sec:0 (~0 mb/sec) Non-Realtime reserve IO/sec:0
Committed RTIO/sec:0 Non-RTIO clients:0 Non-RTIO hint IO/sec:0
Disk stripes:
Primary Stripe [Video] Read:Enabled Write:Enabled
Node 0 [VIDEO_LUN_1]
Node 1 [VIDEO_LUN_2]

Have I've missed something?

This worked on earlier versions of XSAN, and Iäve been setting up the XSAN from the beginning so no migration issue.