That seems like a really odd inventory. Here's my general thoughts on what you have,  In the 3/.5" DAE's;  Could have been deployed so much easier using more 2.5" drives in the DPE, and then using 2.5" drives in more 25 slot DAE's, with NL-SAS the only drives in a 15 slot DAE. There plenty of 2.5" drive options now.  I wouldn't be particularly impressed with there being no spare for your FAST Cache. Who did the design and verified the BOM ?
Greetings,  We have a new VNX 5600 Unified storage array with the following drive type:  -2xVNX 100GB FAST CACHE 25X2.5 DPE/DAE -7xVNX 400GB FAST VP SSD 15X3.5 DAE -43xVNX 600GB 15K SAS 15X3.5 DAE -9xVNX 4TB NL SAS 15X3.5 DAE  the storage array has the 25X2.5 DPE and four 15X3.5 DAEs. Could you please give me some recommendations about how to distribute the disk drives across the available DPE and DAEs. and how to create storage pools for both block and file storage type.  The 2 FAST Cache Disks should be placed in the DPE but is that a recommended method to distribute FAST Cache around the Bus 0 Enclouser 0?? in addition to the FAST Cache disks there are 4 2.5 Vault disks.  any comments would be highly appreciated.   Many Thanks,
VNX 5600 distribute disk drive across the DPE and DAEs