Server configuration for providing VDS hosting?

Question

RAID

Need advice on server configuration to provide VDS hosting services based on KVM technology .

At the moment, there is such a piece of hardware:
- CPU: Core i7-3930k
- RAM: 64GB

Interested in the following questions:
- What HDD to use for local storage?
- Does it make sense to use software RAID10? If not, what RAID controller would you recommend?
- Does it make sense to use two storages? One on HDD, one on SSD (for different customer needs)
- How many (approximately) virtual servers can be placed with minimal overselling?

Answer 1

> - What HDD to use for local storage?
class not lower than enterprise SATA-III.
> - Does it make sense to use software RAID10? If not, what RAID controller would you recommend?
better use software raid10. And even better - 2 on raid1 and keep a close eye on them.
The 10th needs to be monitored very carefully and it is much more difficult to restore it, if anything.
> - Does it make sense to use two storages? One on the HDD, the other on the SSD (for different customer needs)
It makes sense to use ssd as a cache for flashcache. Well, or install ssd of 256-512 GB and not bother with slow virtual machines on mechanical disks then at all.
> - How many (approximately) virtual servers can be placed with minimal overselling?
Depends on virtualization technology. In a good way - 12-14 virtual machines on KVM. But they can run into disk IO.
And about selling or not - your business, in general)

Answer 2

First of all: If you are asking such questions, you should not raise VDS hosting for clients by any means! You will only spoil your karma, at least.
Your question shows a lack of knowledge and experience, and without this there will be a lot of problems.
Practice "on the cats" and you will understand the pros and cons of various solutions and gain at least some experience in dealing with the problems that you will inevitably have.
Putting the cost of your training on the shoulders of your clients in the way that you intend to do so is a dangerous thought.

Answer 3

The processor is not a fountain, so it doesn’t really make sense to install an SSD, a software raid is definitely not, you don’t have enough CPU anyway. If you break it down from memory, you can fit 60 VDS. Read reviews about raids.

Answer 4

60 on such a processor? I would have a maximum of 6-12 - per core per virtual machine.

Answer 5

hdd what you get
raid 10 is undemanding to the processor, so you can. you can set up a raid-z
two storages makes little sense, it's better to set up an ssd for a disk cache, such as fashionable ssd hostings are now. this is done using ARC ZFS.
generally by the number of cores, but more is possible, depending on how you cut the cores

Answer 6

Answer 7

- What HDD to use for local storage?

Western Digital RAID Edition with 5 year warranty.
Software RAID1 rules. Don't over complicate it yet.
Not required at the start. You will have enough other problems.
8 - per processor core per client. I did up to 20, people did not complain. After 60, problems will surely begin.