cloudstack-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From evanitsharp <evanitsh...@gmail.com>
Subject Re: Re: Why is the I/O speed of VM so terrible when using CloudStack4.2 + KVM deployment
Date Tue, 22 Jul 2014 01:20:48 GMT
Hi, David:
Thanks for your suggest.
But I had tested CloudStack4.1.1 + KVM(with rhel6.3),the I/O speed was normal.


Does anyone has any other advice?
Please tell me the details of step on how to solve the problem if possible
Thank you




Evan

Mail:evanitsharp@gmail.com

From: David Nalley
Date: 2014-07-21 12:43
To: users@cloudstack.apache.org
CC: dev@cloudstack
Subject: Re: Why is the I/O speed of VM so terrible when using CloudStack4.2 + KVM deployment
IIRC, virtio wasn't the default until EL6.4.

--David

On Sun, Jul 20, 2014 at 10:12 PM, evanitsharp <evanitsharp@gmail.com> wrote:
> Dear all:
>      I/O speed of our guest VMs are so slow when uploading or downloading file from them.
>      I have tried Basic and Advanced network, but I got the same result.
>
> Our environment is :
>      CloudStack 4.2.1 + KVM Host(with rhel6.3 running on it).
>
> But if I use CentOS 6.4 instead of rhel 6.3 as operating system of KVM host, The I/O
speed is normal.
> Also, CloudStack 4.1.1 doesn't have this problem.The problem only occuring on CloudStack
4.2 or later version
>
> Here are my test data around different version of CloudStack deployment:
> PS: Target VM are virtual machines on KVM Host with WEB or FTP service
> CloudStack versionNetwork type of CloudStackKVM software versionOperating system of KVMStorage
type of VMOperating system of VMread/write speed of VM's diskAverage speed when downloading
file to PC of LAN from target VMAverage speed when downloading file to target  VM from server
of LAN
>
> 4.1.1BasicQEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2);qemu-img version 0.12.1rhel6.3sharedrhel6.349.8
MB/sWEB:38.9 MB/s  FTP:42.2 MB/sWEB:41.0 MB/s  FTP:31.7 MB/s
> 4.1.1BasicQEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2);qemu-img version 0.12.1rhel6.3localrhel6.3116
MB/sWEB:80.6 MB/s  FTP:80.2 MB/sWEB:103 MB/s  FTP:64.1 MB/s
>
>
> 4.2.1BasicQEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2);qemu-img version 0.12.1rhel6.346.0
MB/sWEB:1.05 MB/s  FTP:1 MB/sWEB:700 KB/s  FTP:14 MB/s
> 4.2.1AdvancedQEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2);qemu-img version 0.12.1CentOS
release 6.4 (Final)sharedrhel6.340.6 MB/sWEB:23.8 MB/sWEB:22.6 KB/s
> 4.2.1AdvancedQEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2);qemu-img version 0.12.1CentOS
release 6.4 (Final)localrhel6.348.7 MB/sWEB:24.2 MB/s  FTP:24.5MB/sWEB:24.2 MB/s  FTP:24.8MB/s
>
> 4.3BasicQEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2);qemu-img version 0.12.1rhel6.3sharedrhel6.335.9
MB/sWEB:218 KB/s  FTP:211.9 KB/sWEB:811 KB/s  FTP:3.1 MB/s
> 4.3BasicQEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2);qemu-img version 0.12.2rhel6.3localrhel6.348.5
MB/sWEB:217 KB/s  FTP:212.5 KB/sWEB:708 KB/s  FTP:3.0 MB/s
>
>
>
> Any advice on how can I resolve the problem?
> Looking forward to your reply, thank you.
>
> Evan
>
>
>
>
> Evan
>
> Mail:evanitsharp@gmail.com
Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message