Hi,
SSD storage in a V7K can be used to provide a fast storage tier for the provision of virtual disks or be used in an EasyTier storage pool to boost performance. The SSD can't be used to increase the size of the V7K controller/node cache, this is only the case in IBM XIV storage.
Hope this helps
Darren
Darren Sanders
Principal Consultant
Celerity Ltd
http://www.celerity-uk.com