Expanding storage for MD3200 already connected to MD1200

There are two SQL servers connected to a PowerVault MD3200 DAS. This MD3200 is connected to a PowerVault MD1200 for additional storage.
These are both using 3.5" drives.
I am looking to expand the storage for both the SQL servers and am looking into attaching another MD1200 or maybe an MD1220.
I read the Dell guidebook and it looks like it should be possible to attach an MD1220 to this setup:
http://www.dell.com/downloads/global/products/pvaul/en/powervault-md3200-md3220-technical-guidebook-en.pdf

Even though the MD1220 uses 2.5" drives, looks like it should not be an issue as long as the disks are not used in the RAID as the 3.5"? (they won't be)
Is this guaranteed to work or is there something else on the SQL servers and/or DAS I need to check first before expanding?
SeeDkAsked:
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David Johnson, CD, MVPOwnerCommented:
you can daisy chain three MD1220 enclosures or  six MD1200 enclosures you are limited to 96 drives total. RAID or not to RAID is not an issue.
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SeeDkAuthor Commented:
and it shouldnt matter if I mix MD1220 and MD1200?
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David Johnson, CD, MVPOwnerCommented:
no it doesn't matter just the maximum # of drives is important
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andyalderSaggar maker's framemakerCommented:
I presume this is solved but just to add you can mix 2.5 and 3.5 inch drives in RAID, in fact if you unplug the sleds you may find the disk inside the 3.5 inch caddy is a 2.5 inch disk.
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SeeDkAuthor Commented:
Thank you everyone!
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