Re: [Xen-users] xen ov guest nfs

["Denis J. Cirulis" <denis@xxxxxxxxxxxxx>]

On Sun, Mar 01, 2009 at 08:06:24PM +0700, Fajar A. Nugraha wrote:
> On Sun, Mar 1, 2009 at 6:09 PM, Denis J. Cirulis <denis@xxxxxxxxxxxxx> wrote:
> > I've tried opensuse domU on opensuse dom0 connected 20GB zfs volume off
> > FreeNAS beta using iscsi. Yes, it works normally, no cpu overload.
> 
> So I assume what you wrote about "software iscsi target and initiator gives
> me high cpu load on both domU and target" was from a different setup,
> and that FreeNAS with zfs gives acceptable performance, right?

Yes, former setup was ubuntu linux with iscsi-target + opensuse with
open-iscsi initiator. Now with FreeNAS on 1 GiB interface with jumbo
frames enabled (as well as initiator) looks like cpu load is ok both on 
opensuse initiator and
freenas storage server.
Acceptable performace is 107 MB/s (which is very very good) when
connecting one initiator, with few initiators each is getting about
45-65 MB/s what is also very very good for low I/O domUs.

Fajar, You're using zfs on opensolaris, can You backup domUs when
they're running ? I mean You are creating snapshot on the volume You
want to backup and can do a dd to another storage server or backup
solution ?

> > What is the good style of using iscsi for guests, I need to discover all
> > targets on all dom0 hosts and then start guest on selected machines (as
> 
> Something like that. Whatever shared storage you use, it needs to be
> available on all dom0s. For iscsi, this means importing all iscsi
> shares and reference them on dom0 using a common path on all dom0s
> (/dev/disk/by-path or by-id should be good).
> 
> As an alternative, there's a block-iscsi helper script (try google
> search) that can be used easily.
> 
> > I know target can only be used once) ? How to make migration between
> > dom0 hosts possible ?
> 
> On all shared storage setup, you have to make sure that domUs only
> started on one dom0 at a time. You can use some tools to do this (like
> linux cluster's rgmanager) or (when you only have several domUs) it
> might be pereferable to do it manually.

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