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2 HYper V Hosts over 1 SAN

Posted on 2011-03-22
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Last Modified: 2012-05-11
Hi, I have a HP MSA2000 SAN, set up with RAID 5.
I have 2 DL385 G6 servers, both Hyper V hosts using Hyper V v2 over Server 2008 R2.

Ultimately  I will have this all set up as a Clustered failover server, but ATM the Hyper V First host is running  SBS2008 converted from physical to a virtual server.
I'm using the second host as a test bed to migrate away DC, AD and Exchange functionality from the SBS2008 Virtual machine.

Al the VMs are running from the HP MSA2000.

On host one SBS2008 is running happily.
On the second host,   I have a couple of ifferent Server 2008 R2 servers running as tests.

Strangely though on Host 2, I can't see the folders from the SAN that Host 1 sees and vice versa.
Is there some configuration required so each Hyper V host can see all the folders on the SAN?

I guess it's somewhere on the SAN configuration page, but not sure where.


 
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Question by:afurness
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Author Comment

by:afurness
ID: 35189808
On a reboot of either hosts, I can see the updated data. Although I get "access denied" when trying to view the contents, which is OK at this stage. Just n ot sure why I need to reboot a host to see the folders on the other host.
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Author Comment

by:afurness
ID: 35190005
The specific model number of the SAS is HP  MSA2312sa
 
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Accepted Solution

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andyalder earned 2000 total points
ID: 35190856
Until you setup for clustering you must ensure that no two servers can see the same LUN, NTFS is not a shared filesystem.

Windows stores the file allocation table in RAM, so if server 1 writes to the LUN and then server 2 writes to it the data will get overwritten and thus corrupted. It's not going to check the FAT on the disk because as far as it's concerned it's the same as its own copy in RAM.

Once you do he Hyper-V cluster it'll be OK because clustering knows how to share a LUN whereas normal simple Windows doesn't know how. You setup what servers can see what LUNs under host presentation on the MSA.
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Author Comment

by:afurness
ID: 35196966
Oh ok, so I better remove the test VMs on the other server and just have the one Hyper v server running.
I hope the original SBS2008 server isn't corrupted then, it seems to be running fine atm.
If I shut down the other Hyper V server and and disconect it from the SAN Hopefully it'll be ok.

Once I've migrated away from SBS2008 I'll set up the clustering

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Author Comment

by:afurness
ID: 35196968
And thanks for the info, that could have gone horribly wrong ....
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