Problems with hard drives speed

[_El_Chojin_]

I have one server that is a i7 with 2Tb raid0 and 8Gb of RAM. And i only have 1 KVM so i would like to give to it as much resources as possible, how many ram and cpus need proxmox to run without using swap? And i have another problem and is that windows (the kvm) wirte to disk very slow, and i dont know why because on IO delay on proxmox interface is 0% is limited on any configuration file how much can write/read a kvm on hard drive per second? I have installed on proxmox hdparm to test hard drives and the speed is arround 40Mb/s reading so i think disks are fine and problem may be on the virtualization. I'have this problem in 1.4 i have upgraded to 1.5 to see if problem is solved but i continue having the same problem. I think something must be wrong because to unzip a file of 4.7Gb takes 40minutes when on my home computer the same file with a quadcore without raid takes 5 minutes or a bit more. Any users are on server and no more activity. Anyone know what can i do or test? Thanks.

 

[udo]

...
I think something must be wrong because to unzip a file of 4.7Gb takes 40minutes when on my home computer the same file with a quadcore without raid takes 5 minutes or a bit more. Any users are on server and no more activity. Anyone know what can i do or test? Thanks.

Hi,
try the unzip with only one cpu for the windos-guest. The rusults of my tests shows, that smp with kvm and window (i don't make test with linux and smp) give problems with io. Sometimes the overall-performance are with 2 cpus are better, than with one - but with three, or more cpu's not. Perhaps it's the same for you (i tests one special programm).
And the smp with 2 cpu work best with 2.6.32.

See also here: http://www.proxmox.com/forum/showthread.php?t=2858

Udo

 

[_El_Chojin_]

Hi,
try the unzip with only one cpu for the windos-guest. The rusults of my tests shows, that smp with kvm and window (i don't make test with linux and smp) give problems with io. Sometimes the overall-performance are with 2 cpus are better, than with one - but with three, or more cpu's not. Perhaps it's the same for you (i tests one special programm).
And the smp with 2 cpu work best with 2.6.32.

See also here: http://www.proxmox.com/forum/showthread.php?t=2858

Udo

But if i buy a i7 server is not to use only 1CPU... i want to use as much as possible, and now i'm using only 4cores

 

[dietmar]

But if i buy a i7 server is not to use only 1CPU... i want to use as much as possible, and now i'm using only 4cores

If you need maximal performance you should not use virtualization at all. Instead install directly on your hardware, and you can use all cores.

Virtualization is good when you want to run more than one virtual-server on the host.