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