From: Avi Kivity <avi@redhat.com>
To: Emmanuel Noobadmin <centos.admin@gmail.com>
Cc: kvm <kvm@vger.kernel.org>
Subject: Re: Better to use iSCSI on host or guest?
Date: Tue, 14 Jun 2011 11:18:35 +0300 [thread overview]
Message-ID: <4DF7195B.3090606@redhat.com> (raw)
In-Reply-To: <BANLkTinzgb20tYCb6quWjvLqT6n9eRQRfw@mail.gmail.com>
On 06/13/2011 10:00 PM, Emmanuel Noobadmin wrote:
> On 6/14/11, Avi Kivity<avi@redhat.com> wrote:
> > My gut feeling is to do iscsi in the host. I guess it's best to measure
> > though. Please post your findings if you do that.
>
> Any suggestions or recommendations as to how/what should I be measuring with?
Whatever workload you'll be running on those guests.
> So far in trying to determine how bad is the qcow2 disk bottleneck on
> my VMs, I've been using dd with dsync and direct options as well as
> hdparm which errors out (not sure if this is considered a KVM/virtio
> bug?) on the virtio disk after getting a buffered result.
>
> But these don't seem to be very good tools since it's all sequential
> only. I've tried iozone on my home machine but it takes too long per
> run; unfortunately this host and its VMs are live and I don't have the
> luxury of another full set of hardware to test on.
fio is a good tool.
--
error compiling committee.c: too many arguments to function
prev parent reply other threads:[~2011-06-14 8:18 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-13 16:05 Better to use iSCSI on host or guest? Emmanuel Noobadmin
2011-06-13 16:33 ` Avi Kivity
2011-06-13 19:00 ` Emmanuel Noobadmin
2011-06-14 8:18 ` Avi Kivity [this message]
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