storage services 2012 r2 jbod question

I want to have failover on my devices.

Can I buy 2 JBOD and connect them to 2 servers, 1 JBOD acting as a mirror of the main JBOD without any major setup etc. With 1 server acting as failover for the main one? is this a relatively straight forward thing to do?
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CaptainGibletsAsked:
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David Johnson, CD, MVPOwnerCommented:
it depends on the hardware involved or the use of DFS replication between the 2 jbod's i.e. can the two jbods communicate between themselves? does each server have a connection to each jbod?
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CaptainGibletsAuthor Commented:
Jbod are dell md1220 dual sas ports ao fan connect each device to both servers
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David Johnson, CD, MVPOwnerCommented:
not directly with those 2 items, I'd suggest you look at one of dell's jbod solutions.
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Cliff GaliherCommented:
If you don't want to look at storage vendor solutions, you can accomplish this with one more JBOD and use windows storage spaces. A mirrored pool can be made enclosure aware, but Microsoft currently has a minimum of three enclosures to turn this on. As far as a server acting as a failover, standard windows clustering might be able to do that. Depends on the workloads,
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CaptainGibletsAuthor Commented:
I am watching this video

https://www.youtube.com/watch?v=X5eCQY91aU4

and at 16:00 it describes exactly what I want. Setting up 2 JBOD's with storage services being enclosure aware and placing a copy of data on each JBOD.

Is the video wrong? As everyone says the same thing, you need 3 jbods etc.
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Cliff GaliherCommented:
The video illustrates the concept, but does not go into implementation details. As such, this isn't one being wrong and the other being right. Both are true. Here are the details on storage spaces enclosure awareness:

http://social.technet.microsoft.com/wiki/contents/articles/11382.storage-spaces-frequently-asked-questions-faq.aspx#Enclosure_Awareness_Support_Tolerating_an_Entire_Enclosure_Failing
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CaptainGibletsAuthor Commented:
So reading that link, to support failover you need 3 enclosures running a 2 way mirror.

Surely if you have 2 enclosures, with a 2 way mirror and 1 enclosure goes down the data should still be on the other enclosure as you have a mirror set up and its enclosure aware so each part of the data is put on to both enclosures.

If 1 goes down will the other not just take over, then when you replace the failed JBOD it will rebuild it just like a disk would in raid-1?
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Cliff GaliherCommented:
If you are asking me to choose between Microsoft's official guidance and your own decision that this "must" be how it works with no documentation to back up your hypothesis, I'll choose Microsoft guidance every single time. You need three enclosures to guarantee resiliency with an enclosure failure. Anything less is not guaranteed.
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CaptainGibletsAuthor Commented:
Answer was simple, you need at least 1 disk on 3rd enclosure to act as a witness.
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CaptainGibletsAuthor Commented:
So I also have an md1200, which would make 3. However I want to give most the storage from my MD1200 to my DPM server, not mirrored.

Can I add 1-2 disks from this enclosure, to my storage pool with my other 2 enclosures to enable an enclosure failover mirror?
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Cliff GaliherCommented:
Nope. All three jbods should be equal (number and size of disks) for that.
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