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Hyper-V Memory Issues

Posted on 2011-09-16
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Last Modified: 2012-06-27
I have hyper-v installed on a win 2008r2 server with dual core xeon processor and 16gb RAM.

I have 4 virtual servers running. Each server has 1024mb of ram allocated to them. When i turn off the server and increase the ram (to 2048 or 4096) on any of the servers, the server will fail to start.

Any ideas why i am limited to 1gb???

Thanks

 
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Question by:Antikythera
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by:Greg Hejl
ID: 36548465
http://msdn.microsoft.com/en-us/library/cc768529%28v=bts.10%29.aspx

what memory do you have reserved for the host?

are you running R2 SP1?  SP1 adds dynamic memory management to hyperV
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Author Comment

by:Antikythera
ID: 36548521
Its SP2, where do i check the memory reserved for the host?
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Expert Comment

by:Greg Hejl
ID: 36548578
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What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 
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Accepted Solution

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Lester_Clayton earned 2000 total points
ID: 36551808
By looking at the error you posted, it looks like it was unable to create the VMEM file - this file is created to store the memory of the virtual machine.  It seems like it was unable to create a 2048 MB file.  Do you have 2 GB of free space available on the D: drive?
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Author Comment

by:Antikythera
ID: 36552034
I am currently up to capacity on my physical data drive and problems only seemed to have started happening since it filled (also the virtual servers pauses itself alot!)... Would I require 2gb of free hdd space to be able to allocate 2gb ram??? Thanks
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Expert Comment

by:Lester_Clayton
ID: 36552107
If you run out of disk space, Hyper-V very thoughtfully will pause a server - so that no more disk space can be used :)  The pausing of some VM's is just another symptom of low disk space
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Expert Comment

by:Greg Hejl
ID: 36552503
good one Lester!

I had forgotten about alloting drive space for the VM memory!

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Author Closing Comment

by:Antikythera
ID: 36581294
Thanks for picking up on this, saved me a few headaches!
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