Re: [Xen-users] Debian - DomU on ZFS

[Net Warrior <netwarrior863@xxxxxxxxx>]

Thanks for your answer,

I have two scenarios.
One local server for testing purposes using zfs.
A SAN.

I think I will move forward with something like this,  disk=[ 
'iscsi:2011-09.us.example:server,xvda,w', ]
Do you think is this much more reasonable?
I think that for the local server that will be much better than using 
images, do you agree?
Thank you very much.
Regards

El 09/14/2011 01:03 AM, Fajar A. Nugraha escribió:
> On Wed, Sep 14, 2011 at 10:50 AM, Net Warrior<netwarrior863@xxxxxxxxx>  wrote:
> > Hi there .
> >
> > I just come up with the need to migrate my LVM to zfs ,
> Is this zfs-fuse, zfsonlinux, or did you switch the dom0 to
> opensolaris, or did you have separate storage server with zfs?
>
> > when using LVM I was
> > able to reference my LV partitions as /dev/VG/LV,  then within the
> > configuration file I could reference the device as phy:/dev/VG/LV, now with
> > zfs I've got my disk and the pools as in , mypool/storage1,2,3 and so on.
> >
> > Now my question is.
> >
> > I did not find any /dev/ reference to point to in the configuracion file as
> > in solaris, like /dev/zvol,  so, should I create an image file and then
> > install?
> zfs-fuse does not support zvols, and it's not recommended to store VM
> images as files (trust me, I tried).
>
> With zfsonlinux you WILL have /dev/zvol/mypool/storage1. That is,
> assuming you either use Ubuntu ppa or latest source from git to
> install zfsonlinux.
>
> > Will that methood downgrade my I/O  performance or will that be handled bu
> > the access methood I use? iSCSI, SAN Storage, Disk Type,  HBA, network speed
> > and so on.
> Roughly speaking, on the same hardware, using file image on zfs or
> zvol, will make i/o performance drop by 50-75% compared to plain LVM.
> Again, this is ROUGHLY based on my past tests. YMMV.
>
> > Anyone already installed the combination of ->  DomU+ZFS+Debian?
> I have a dev system with xen+zvol+RHEL, as well as another one with
> xen+zfs-fuse+RHEL.

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