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  1. #1
    Join Date
    Dec 2009

    Starting VPS business

    Dear WHT,

    Im basically startng VPS business and im thinking abut getting the following node.
    Dual quad core x3440 with 16GB RAM, 1gbps uplink and 4 SAS 15k drives or 8x SATA2 7.2k drives.

    Shall I take 4 SAS or 8 SATA2 drives in RAID10? What will be better in the long run? How do I calculate how many VPSs can I run there? WHat cold the the bottleneck in this configuration?

    Thank you for your time

  2. #2
    Join Date
    Dec 2006
    For HDD\RAID:
    Personally i would recommend going with SAS drives in RAID10.

  3. #3
    Join Date
    Mar 2010

    usually iops is the limit

    We're all mostly limited in IOPS, so the amount / speed of spindles matters a lot, as does having SAS drives that have larger queues.
    So, normally 8 small SAS drives > 4 larger SAS drives > 8 SATA drives.

    With 16GB Ram you can expect to run 15-30 VPS depending on how much memory they get to see (or more with openVZ). Usually the bottlenecks are memory and disk IO performance. You could opt to add more SAS drives once you hit 40% system usage.

    If you want a hint: Look up how the Linux IO schedulers work (deadline and cfq with priority classes)
    Check out my SSD guides for Samsung, HGST (Hitachi Global Storage) and Intel!

  4. #4
    Join Date
    Jul 2009
    I'd go with the SAS drives too, and I'd add some RAM. Your bottleneck will probably be disk IO but people want high RAM even if they're not going to use it all.

    The SAS drives will be faster, and I've found them to be much more reliable as well, since they're built primarily for server use.
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  5. #5
    Join Date
    Feb 2011
    United States
    What are you looking to offer? vmware... XEN... openvz?
    FusionNET Solutions
    OpenVZ & XEN VPS available in US & UK.
    IRC & Adult Allowed, RDNS Control, 24/7 Helpdesk, VPN Ready, Native IPv6 Ready!

  6. #6
    Join Date
    Dec 2009
    Okay, I will take 24GB instead of 16GB RAM and 4 SAS drives instead of 8 SATA2 drives. Thanks for your help.

    I'm planning to run at least 30 VPS's there, otherwise I will have a clean loss considering this server will cost me 400-500eur a month.

    Also, for the best experience shall I allocate my client all CPU's(equal share) or allocate 1 or 2 CPU's per VPS? In the past my old VPS provider suspended my VPS for causing high load to the node, and I had to upgrade to plan 2 with 2 cores. After that everything was ok. So basically, can VPS's with 1 core cause issues to VPS Node?

    There is also something what bothers me. On my another provider they said I'm causing high load and moved me to less-loaded node, where I wasn't causing high load. How is that possible?

    Thank you for your help. I appreciate that.

  7. #7
    Join Date
    Jun 2009
    SAS drives will be cheaper if you are leasing the server.

    I suggest eqal share, but limit cpu lime so high end plans have more cpu time.

    Your old provider has/had overloaded nodes I guess.

  8. #8
    Join Date
    Mar 2009
    Austin, TX
    SAS over SATA on what you described.

    Assign cores according to your plan as you see fit, as equal share. Put a good eye/monitoring on your server and you will be fine.
    Having severs with customer data on it without proper monitoring is like having one night stand without using protections - eventually, there will be an 'oh s**t!' moment.

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