HyperV Out of memory errors refusing boot up

[Sonic007]

Anyone else applied Windows updates and found when restarting their HyperV VM that the machine wont start giving out of memory errors?

 

Only way to get it to boot is to reduce the memory ram allocated to it and then it boots.

 

 

Anyone else had this? Any fixes?

 

 

Thanks all for your help.

[Steve21]

I mean normally that just means you’re over provisioning your host

 

If you look at all your VMs do you have more (or close to) the hosts memory assigned? Especially if you’re using dynamic look at the start up vs running settings

 

Steve

[Sonic007]

Thanks for your reply.

 

I have 64GB Physical RAM...

 

I have 32GB allocated to my Sims HyperV Server which runs two instances of Sims on that server. (Set to dynamic)

 

I then had about 16GB allocated to my Domain Controller. Set as mimimum 2GB max 16GB.

 

I now can only seem to allocate 4GB (2GB Used) to my DC. It gives the memory error and refuses to start if I add any more.

[3s-gtech]

I don’t think dynamic is a good idea for your SIMS server. SQL Server will vacuum up RAM, whether it needs it or not - SQL should be set to a RAM limit that allows the whole DB to fit in memory but no need for much more. You’ll need to calculate that for your particular setup.

 

I suspect it has nicked all of your RAM and the poor DC has nowt left.

[Sonic007]

Thanks.

 

If I turn off dynamic on the sims server it shouldn’t cause any problems should it?

[3s-gtech]

Thanks.

 

If I turn off dynamic on the sims server it shouldn’t cause any problems should it?

 

You’ll need to check the size of the DBs, give the SIMS server enough for them plus the OS and anything else running like a sync tool or connector. You’ll then need to set SQL to a RAM limit otherwise it can consume the OS and it’ll start running like treacle - that’s done in SQL Management Studio.

 

After that, no you shouldn’t have problems.

[mavhc]

Dynamic can still have a max. HyperV manager should show the current ram usage, and taskmanger the free ram.