Softaculous

Topic : Virtualizor KVM plans recommendation

Posted By: indy0077 on August 26, 2017, 6:29 am

Again, as the VIRTUALIZOR SUPPORT DOESN'T RESPOND, unfortunately I have to open a new thread.

I would like to know your opinion on this. I have one server:

Intel Xeon E5-1620v2, 3.9GHz

4c/8t

16GB DDR3 ECC 1333 MHz

SoftRaid 2x2TB SATA

Now I want to created 6 KVM plans which start from 1 GB RAM up to 12 GB RAM.

The question is:

1. What should be the best configuration of CPU Units, CPU Cores and CPU % to guarantee best performace of each created VPS?

2. How many VPS could be created with this server specification?

3. Can I create more VPS which would have more RAM in sume as the physical RAM is? (if yes, how
will it be handled if all VPS are working at the same time?)

4. Can I assign 4 cores to each VPS?

Thanks

Posted By: abhijeetm on August 28, 2017, 5:10 am | Post: 1

Hi,
You can know the limitations on resource and VPS creation by reading following documentation on KVM on CentOS 7:
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Virtualization_Deployment_and_Administration_Guide/chap-Overcommitting_with_KVM.html

Please mention the Virtualizor ticket # with which you are still awaiting for a reply.

Posted By: indy0077 on August 28, 2017, 5:32 am | Post: 2

Quote From : abhijeetm August 28, 2017, 5:10 am

Don't understand your "answers" with link posting. I asked for some recommendations or examples not for a technical explanation.

Posted By: indy0077 on August 28, 2017, 5:33 am | Post: 3

Here are my questions again:

1. What should be the best configuration of CPU Units, CPU Cores and CPU % to guarantee best performace of each created VPS?
2. How many VPS could be created with this server specification?
3. Can I create more VPS which would have more RAM in sume as the physical RAM is? (if yes, how
will it be handled if all VPS are working at the same time?)
4. Can I assign 4 cores to each VPS?

Posted By: abhijeetm on August 28, 2017, 11:10 am | Post: 4

Hi,
Below is the answer for your queries:
1. What should be the best configuration of CPU Units, CPU Cores and CPU % to guarantee best performace of each created VPS?

- You can assign 2 cores at 200% to get best performance on an averagely loaded VPS

2. How many VPS could be created with this server specification?
- Your server has 8 cores, and each should be able to handle 4 VPS having average load, so total of 32 to 40 VPS

3. Can I create more VPS which would have more RAM in sume as the physical RAM is? (if yes, how
will it be handled if all VPS are working at the same time?)
- Yes, but you will also need to have enough swap space

- If all VPS are consuming 100% of their RAM, then server will have to juggle VPS memory space between its SWAP and main memory (16GB), which will hinder VPS performance if there is not enough swap space available on server

- If server has 16 GB RAM and 40VPS using 1GB RAM each, then for VPS to perform decently, the server must have SWAP space:
[40GB (VPS total RAM) + 4GB (server RAM) +4GB (minimum swap)] - 16 GB = 48-16 = 32GB swap

4. Can I assign 4 cores to each VPS?
- Yes
- You can assign maximum of 8 vCPU cores per VPS
- If all VPS are requesting for CPU power, then this VPSes will be served based on their priority
- VPS CPU priority can be set using "CPU Units", where higher the value, higher will be the priority

For disk:
- Disk Cache set to "writethrough" or "writeback" with IO policy "thread" gives decent VPS disk IO performance.
- Use virtio optimized IO performance
- If you are using CentOS 7, then you will also be able to limit VPS disk I/O speed

Posted By: indy0077 on August 28, 2017, 10:21 pm | Post: 5

Thank you very much abhijeetm. That is it what I wanted to hear.