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From Geoff Higginbottom <>
Subject RE: VM showing half of the provisioned memory.
Date Wed, 14 Jan 2015 17:25:57 GMT
Hi Abdul,

This was something Len and I discussed a while back but I am still seeing strange behaviour
in my current 4.3.2 test system.

What I am seeing is that Windows VMs get 4x the RAM allocated to them on the Hypervisor (XenServer)
but the OS is also reporting 4x the RAM.

Linux VMs are getting 2x the RAM allocated to them on the Hypervisor (XenServer) but the VM
is still only reporting its allocated RAM.

However if I recall when I first spotted this in earlier versions, Linux VMs would actually
get LESS RAM allocated to them which sounds like what you are seeing.

I'm sure I logged this as a bug and it looks like the behaviour has changed but it is still
behaving strangely, at least on XenServer.

I'm sticking with my previous advice to Len which was to not mark Templates as Dynamically
Scalable.  As Len points out, you simply change the Template configuration and then Stop/Start
 your VMs.


Geoff Higginbottom

D: +44 20 3603 0542 | S: +44 20 3603 0540 | M: +447968161581

-----Original Message-----
From: []
Sent: 14 January 2015 16:43
Subject: RE: VM showing half of the provisioned memory.

Hi Abdul,

Are you running XenServer with Dynamic Scaling enabled on your templates?

I had this issue and the only way to fix it was to disable the "Dynamically Scalable" option
on my templates, then shut down my vms (not restart) and then bring them up again.  After
that they received all of the memory. This was only on Linux machines. Windows vms are fine.

I am using ACS 4.3. It sounds like a bug to me, but not sure.


---Original Message-----
From: Abdul Rasool []
Sent: 14 January 2015 16:28
Subject: VM showing half of the provisioned memory.


All the VM instances in ACS is showing half of the memory, actual provision to this particulate
VM is 2GB but instance is showing only 1GB. could you please explain me why is this happening

free -m
             total       used       free     shared    buffers     cached
Mem:           986        977          8          0          0         25
-/+ buffers/cache:        951         35
Swap:         8001       3995       4005

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