Hello,   You are correct that you cannot create a volume that only resides on the SSDs.  There are two RAIDsets created in the XS, on using the SSDs the other the spinning disks.  They are then joined together.  Writes have a bias to the SSDs, it's not 50% though.   It's a bit more complicated than that.   This PDF has more info on the Hybrid Balancer.  [URL]  If you were able to create a single volume, you would lose a great deal of the overall benefit of the Hybrid array.   It's very rare that an entire volume is busy all the time.   But you would be storing active and inactive pages on the SSDs.  Preventing the idle data from being moved to the spinning disks.   Regards,  Don 
Hello, We plan to use PS6210XS and want to create SSD volumes for particular database tables. Is it possible that we create RAID with only SSD disk and create volumes ? If so,how can we configure storage pools?  Thanks 
PS6210XS SSD only volume