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Posted to users@cloudstack.apache.org by WXR <14...@qq.com> on 2013/07/31 17:32:08 UTC

iSCSI IO performance is worse than NFS,why?

I find that the disk IO performance of vm instances on iSCSI(sharedmountpoint) primary storage is worse than that on NFS primary storage.

When I use a single hdd and create a NFS share as primary storage,the disk IO performance is pretty good.
But when I use the same hdd and create a iSCSI lun as primary storage,the disk IO performance is lower than NFS.

I think the disk IO performance of iSCSI should be better than NFS.

Re: iSCSI IO performance is worse than NFS,why?

Posted by Aaron Delp <aa...@citrix.com>.

On 7/31/13 8:32 AM, "WXR" <14...@qq.com> wrote:


>I find that the disk IO performance of vm instances on
>iSCSI(sharedmountpoint) primary storage is worse than that on NFS primary
>storage.
>
>When I use a single hdd and create a NFS share as primary storage,the
>disk IO performance is pretty good.
>But when I use the same hdd and create a iSCSI lun as primary storage,the
>disk IO performance is lower than NFS.
>
>I think the disk IO performance of iSCSI should be better than NFS.

> What hypervisor are you using to attach?