Yes, likely possible but probably not without loosing the data you have on the vdisks/volumes. The MSA 2040 includes the ability to use virtual storage instead of linear storage. You would add your vdisks (regardless of their RAID config) to 'Pool A'. This creates one large storage 'pool'. From there, you can create a volume out of the pool (or multiple if you wanted). The size of the volume can be as large as the MSA or VMWare maximums. The maximum LUN size for the MSA is 128 TiB. You will ideally want all the vdisks, in the pool, to be configured with the exact same set size and RAID type (which it sounds like you may already have). Note that, by adding everything to 'Pool A', this essentially means that controller B is doing nothing more than standing by for a failover situation. In a perfect world, you would have all your vdisks spread amongst both Pools A and B so that both controllers can be 'working' at the same time. This would defeate your goal of trying to get this as one large volume. Note that the extent method, you are already using, may be totally approriate in many cases. Make sure you're using the latest firmware GL220P009.
Reference
https://www.hpe.com/h20195/v2/GetPDF.aspx/c04123144
https://www.hpe.com/h20195/v2/GetPDF.aspx/4AA4-6892ENW.pdf
