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Why NetApp/EMC/Dell NAS solution instead of Windows Server 2012/2012-R2 Share (and/or DFS)?

We are currently on NetApp and use it for SAN and NAS functionality with some basic quota management. We are leaving NetApp for various reasons and thus looking at the NAS solutions by the competitors and find the quota management and reporting leaving much to be desired.

I just started exploring all the various file and share management capabilities of a Windows Server installation. I've known for years about basic sharing of folders on Windows systems but never managing it from the services side of things. These two blog entries gave me a brief outline of what it is capable of and it seems to blow those enterprise NAS hardware/software solutions out of the water. Am I missing something? http://www.zohno.com/articles/2011/11/24/windows-server-2012-file-services/ and http://www.zohno.com/articles/2011/11/24/windows-server-2012-file-server-resource-manager/

What we want to do is have shares at various level and quotas as the root and subfolder levels. We want to report on the file usage, know who is using up the most space, have end user feedback that they hit a limit, know which directories are growing the fastest, etc. We also want to implement this all within DFS if possible. We want a common namespace so the user doesn't need to worry about what the IP and systemname is on the backend and we can then sync with our remote sites over the WAN. If they upload data we want it synced locally so we can back it up for them and handle restores.

We realize that DFS can have multiple systems underneath the various subfolders but another question I have is "can it point to NAS solutions from vendors like NetApp and then use the file resource manager tools to manage quotas instead of what those vendors provide? Or is that only managed outside of the DFS host? We are a VMware shop and on fully redundant SAN on the backend with large clusters so reliability and HA are covered from what we have set up.

Sorry for the loaded question. It's hard to find consultants who specialize in managing file shares, DFS, and can accurately compare those to the NAS solutions from NetApp, EMC, Dell, and other NAS providers.
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Thanks. The reason we have used the SAN/NAS solution in the past is because of site to site replication and snapshot retention as well as storage vMotion. Internal disks are capable of many of the features but it's a whole other storage platform to manage, report on (disk IO) etc. We have very large TB NAS solutions so it seems that Storage Server would be significantly cheaper. We have an excellent EA with Microsoft given the size of our global company and we have very large VMware clusters anyway. The only significant cost is on the storage space on the SAN. Also with DAS you have to make precautions for having enough drive bays or how many daisy chained enclosures your system can handle.

Regarding protocols we have mostly PCs with some Mac and Unix systems but Server 2012 and later support NFS shares for those rare cases so they would seem to work. Mac can connect to SMB shares too.
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We are moving off of NetApp to Compellent. If we do NAS with Compellent they have the FS8600 NAS head units.
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Does storage server provide near instant snapshot capabilities? right now we take snapshots of our 25TB systems every couple of hours and store for 7 days giving us very granular restore capability using the "Previous Versions" tab in a folder's properties tab. End users can restore their own files in seconds.
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Thanks. We only use this feature for our NAS filers and 1 Windows server being used as a file server. I will check with our SAN vendors we're looking at to answer and show this functionality.
I've requested that this question be deleted for the following reason:

Not enough information to confirm an answer.
I would state that all experts contributed valuable information to answer the author's question. It seems he only forgot to close the question and award points.