Adding more disks to an existing pool failes

Hello

The system is VNXe3150 with 12Xsas 600GB 15K disks.

I've created a storage pool using all the disks.

Now i'm runni gout of disk space and I've bought a new disk-array enclosure.

In the new enclosure there are 10 identical disks ( sas 600GB 15K).

When i'm trying to expand the disk pool, i'm getting this message :

"There are not enough disks available for this storage pool. To continue, add more disks of the same type, capacity, and rotational speed."

What is the problem?

Yaniv