Another RDS server?
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Why do the users need a terminal server? Does everyone need it?
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@IRJ said in Another RDS server?:
Why do the users need a terminal server? Does everyone need it?
Are you asking the OP to justify the use case?
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@DustinB3403 said in Another RDS server?:
@IRJ said in Another RDS server?:
Why do the users need a terminal server? Does everyone need it?
Are you asking the OP to justify the use case?
Yes
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@IRJ said in Another RDS server?:
Why do the users need a terminal server? Does everyone need it?
You asked this yesterday. I'm guessing he just doesn't want to answer you
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@siringo said in Another RDS server?:
@Pete-S yes, there's one other VM. It has 8vCPU's 16GB of startup RAM and uses dynamic memory.
Aside from your runaway program eating memory, this is a problem. You are causing a wait state for CPU availability.
What was drilled into me back when I moved to virtualization is that before the Hypervisor can send the job to the real hardware, enough real cores had to be available to match the number used by the VM.
So each VM must have clock cycles for all 8 real cores available before they can process things.
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@JaredBusch Are you trying to say that not a single VM should have 8vCPUs or just that it would be better that @siringo decreases vCPU number on secondary (non-RDS) VM
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@Mario-Jakovina said in Another RDS server?:
@JaredBusch Are you trying to say that not a single VM should have 8vCPUs or just that it would be better that @siringo decreases vCPU number on secondary (non-RDS) VM
None should have 8 because of his CPU only have 8 cores.
I would set the RDS to 6 and the other to 1 or 2 depending on what it is..
Basically, everything should be only 1 or 2 vCPU unless specifically noted otherwise.
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@JaredBusch said in Another RDS server?:
None should have 8 because of his CPU only have 8 cores.
Does it mean that in my case (4-core CPU) VM should use only 3 vCPU even if it is only VM on the host?
@JaredBusch said in Another RDS server?:
Basically, everything should be only 1 or 2 vCPU unless specifically noted otherwise.
For DB servers and RDS servers, we use all available cores to better serve more users at the same time. Is something wrong with that?
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@Mario-Jakovina said in Another RDS server?:
Does it mean that in my case (4-core CPU) VM should use only 3 vCPU even if it is only VM on the host?
Generally you don't want to match 1:1 because the management interface (vmware exi, hyper-v dom0, XCP-ng etc) all have some overhead.
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@Mario-Jakovina said in Another RDS server?:
@JaredBusch said in Another RDS server?:
None should have 8 because of his CPU only have 8 cores.
Does it mean that in my case (4-core CPU) VM should use only 3 vCPU even if it is only VM on the host?
Yes, this is correct.
@JaredBusch said in Another RDS server?:
Basically, everything should be only 1 or 2 vCPU unless specifically noted otherwise.
For DB servers and RDS servers, we use all available cores to better serve more users at the same time. Is something wrong with that?
While you can assign all cores to every virtual machine, it is a horrible idea. The virtual machines will be doing next to nothing but waiting on each other to finish background processes.
Check out
https://www.hpe.com/us/en/insights/articles/10-virtualization-mistakes-everyone-makes-1808.html
and
https://www.sqlskills.com/blogs/jonathan/cpu-ready-time-in-vmware-and-how-to-interpret-its-real-meaning/
if you want to know why. -
@travisdh1 said in Another RDS server?:
While you can assign all cores to every virtualhorrible idea. The virtual machines will be doing next to nothing but waiting on each other to finish background processes.
I did not mean to say that we have multiple VMs with all cores assigned.
We have one VM on one host, and we assign all cores to it - is that OK? -
@Mario-Jakovina said in Another RDS server?:
@travisdh1 said in Another RDS server?:
While you can assign all cores to every virtualhorrible idea. The virtual machines will be doing next to nothing but waiting on each other to finish background processes.
I did not mean to say that we have multiple VMs with all cores assigned.
We have one VM on one host, and we assign all cores to it - is that OK?IT will not have bottlenecks (generally) but it is still a horrible practice.
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@travisdh1 said in Another RDS server?:
@Mario-Jakovina said in Another RDS server?:
@JaredBusch said in Another RDS server?:
None should have 8 because of his CPU only have 8 cores.
Does it mean that in my case (4-core CPU) VM should use only 3 vCPU even if it is only VM on the host?
Yes, this is correct.
Does it mean than in 1:1 virtualisation, you always "lose" one core?
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@Mario-Jakovina said in Another RDS server?:
@travisdh1 said in Another RDS server?:
@Mario-Jakovina said in Another RDS server?:
@JaredBusch said in Another RDS server?:
None should have 8 because of his CPU only have 8 cores.
Does it mean that in my case (4-core CPU) VM should use only 3 vCPU even if it is only VM on the host?
Yes, this is correct.
Does it mean than in 1:1 virtualisation, you always "lose" one core?
Hypervisor needs to use the processor too. When you do not have 4 cores available, then the VM has to wait its turn.
Read the links, learn, and then respond again. -
@Mario-Jakovina said in Another RDS server?:
you always "lose" one core?
Also, if you are spec'ing your system this closely, you likely have other design issues.
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@JaredBusch said in Another RDS server?:
IT will not have bottlenecks (generally) but it is still a horrible practive.
We did not notice any wrong with that.
We tested speed on our 4 vCPU VMs against Vultr 4 vCPU VM, and ours are much faster (50% if I recall correctly) -
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@Mario-Jakovina said in Another RDS server?:
We tested speed on our 4 vCPU VMs against Vultr 4 vCPU VM, and ours are much faster (50% if I recall correctly)
That is a waste of a test. It means nothing.
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@JaredBusch said in Another RDS server?:
@Mario-Jakovina said in Another RDS server?:
We tested speed on our 4 vCPU VMs against Vultr 4 vCPU VM, and ours are much faster (50% if I recall correctly)
That is a waste of a test. It means nothing.
We tested it to compare speed to understand what speed on VM do we get for money.
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@Mario-Jakovina said in Another RDS server?:
@travisdh1 said in Another RDS server?:
@Mario-Jakovina said in Another RDS server?:
@JaredBusch said in Another RDS server?:
None should have 8 because of his CPU only have 8 cores.
Does it mean that in my case (4-core CPU) VM should use only 3 vCPU even if it is only VM on the host?
Yes, this is correct.
Does it mean than in 1:1 virtualisation, you always "lose" one core?
Ah, I was thinking you had both VMs running on a single host. My bad.
