cloudstack-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From evanitsharp <evanitsh...@gmail.com>
Subject Why is the I/O speed of VM so terrible when using CloudStack4.2 + KVM deployment
Date Mon, 21 Jul 2014 02:12:18 GMT
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