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Slow kvm, root cause
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Slow kvm, root cause

I have a kvm with a well known provider here and it’s just really sluggish 80% of the time I use it. I contacted support but they see no problems on their end and insist it must be user error. Could this be a case of the provider over provisioning?

Hardware wise it’s a 1 vcore with 2gb ram and I loaded Ubuntu on it. HDD is a raid6 config. I think they use solus for virtualization and all devices utilize virtio drivers.

When I run bench.sh my disk io is all over the place. Sometimes I hit upwards of 500MB/s and others it’s reportiing like 20MB/s.

When it’s really sluggish I’ll run stuff like htop and iotop but it shows nothing happening.

I got this kvm during one of the big promos and probably won’t bother getting anything else from them once it expires, but I was just curious what could cause it and if there’s anything else I can do or check to find out.

Comments

  • AnthonySmithAnthonySmith Member, Patron Provider

    1 vcore and raid 6 is slow as all hell so yeah..

    Thanked by 1vish
  • https://www.storagecraft.com/blog/raid-performance/

    If performance only recently started being inconsistent, then the array might be rebuilding after a disk failure - it can last for quite a while depending on their setup.

    Thanked by 1vish
  • JoeMeritJoeMerit Veteran
    edited February 2018

    Just name the provider and price point and we'll tell you whats going on.

  • Wait, why are you using raid 6 inside a KVM?

  • AnthonySmithAnthonySmith Member, Patron Provider

    AlyssaD said: Wait, why are you using raid 6 inside a KVM?

    I am pretty sure he means the host uses raid 6.

    Thanked by 1Aidan
  • @AnthonySmith said:

    AlyssaD said: Wait, why are you using raid 6 inside a KVM?

    I am pretty sure he means the host uses raid 6.

    Yah the host uses raid6.

    @AnthonySmith thanks for confirming my suspicions. It never was very responsive to begin with.

    For the price I wasn’t expecting real performance, but I also wasn’t expecting it to feel like I’m logged into a TRS-80

    @Aiden thanks for the suggestion, doubt that is the cause as it’s been like that for 10+ months now

    I’m not sure what @cociu does but I have a similar config from him that I paid less for and it is always snappy

  • yup, just cancel it and move on, sounds like you have less than 2 months left on it.

  • It could also be the CPU is saturated if they are doing Linux Raid 6. That or a noisy neighbor. Could also be a faulty disk, or other piece. You could ask that they move your VM to another server.

    Thanked by 1vish
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