[PVE-User] Problems with 1.8

[Martin Maurer]

> -----Original Message-----
> From: pve-user-bounces at pve.proxmox.com [mailto:pve-user-
> bounces at pve.proxmox.com] On Behalf Of Gusek, Michael
> Sent: Montag, 20. Juni 2011 10:56
> To: pve-user at pve.proxmox.com
> Subject: Re: [PVE-User] Problems with 1.8
> 
> Hi everybody
> 
> Now I've found out the reason why my virtual machines are not booting: For
> each virtual machine I have to set up "cache=writethrough" in their config.
> With "cache=none" (as the default setting), I see "Read failed" on the ssh-
> console, if I start a machine manually: " kvm -drive file=/dev/storage01/vm-
> 101-disk-1,if=virtio,index=0,cache=none,boot=on -boot c -m 512 -k de -vnc :1".
> The "Read failed" occurs if the BIOS want's to load the MBR.
> 
> Therefore my questions are: What's the difference between Proxmox 1.7 and
> 1.8? Is it possible to change the default "cache=none" on a central point? Will

[Martin Maurer] 
See the detailed release notes of 1.8. http://pve.proxmox.com/wiki/Roadmap#Proxmox_VE_1.8
Cache=none seems to work best for most of our users. The upcoming V 2.0 will allow to sets the cache settings on the gui for each disk. for the 1.x series you need to specify the setting in the /etc/qemu-server/VMID.conf file.

> there be disadvantages by using "cache=writethrough" ?

[Martin Maurer] 
Performance is not as expected on some hosts. Check the man pages of KVM ('man kvm') about the different modes.

Martin 

> 
> Regards,
> 
> Michael
> 
> -----Ursprüngliche Nachricht-----
> Von: pve-user-bounces at pve.proxmox.com [mailto:pve-user-
> bounces at pve.proxmox.com] Im Auftrag von Alain Péan
> Gesendet: Dienstag, 5. April 2011 15:07
> Cc: pve-user at pve.proxmox.com
> Betreff: Re: [PVE-User] Problems with 1.8
> 
> Hi Michael, Hi Giovanni,
> 
> There is something I don't understand in your answers. I myself don't use fiber
> channel SAN (only iSCSI) and I don't know them well, but I think the SAN should
> be seen inside your host as a physical device, something like /dev/sdb.
> 
> I don't understand why you had to boot on a lenny rescue CD to add your LVM
> volume groups. In my opinion, if the storage is configured
> (recognized) on the host, from the Proxmox web interface, all you have to do is
> to add an LVM group on this storage.
> 
> The difference with iSCSI is that you don't have  a tool built inside the web
> interface to add Fiber Channel target. So I think you have to do it manually
> inside your host...
> 
> Perhaps this thread on the forum can give some hints ?
> http://forum.proxmox.com/archive/index.php/t-
> 5186.html?s=3553954f01702c4378597ad8a56ff58f
> 
> Alain
> 
> Le 05/04/2011 13:00, Gusek, Michael a écrit :
> > Ah ok i understand. At the moment, I don't have a running virtual machine, so
> I can't change a kernel inside the VM. How can I reset my host storage
> configuration ? Deleting and (re)adding my volume groups on the web page?
> >
> > Michael
> >
> > -----Ursprüngliche Nachricht-----
> > Von: pve-user-bounces at pve.proxmox.com
> > [mailto:pve-user-bounces at pve.proxmox.com] Im Auftrag von Giovanni
> > Toraldo
> > Gesendet: Dienstag, 5. April 2011 12:52
> > An: pve-user at pve.proxmox.com
> > Betreff: Re: [PVE-User] Problems with 1.8
> >
> > Il 05/04/2011 11:43, Gusek, Michael ha scritto:
> >> Changing to ide has no effect. I'm running kernel 2.6.35-1-pve how can I
> change to bpo kernel ? Is it save with proxmox ?
> > When you change to ide you need to adjust grub kernel parameter, did you
> changed root=/dev/vdaN to root=/dev/hdaN?
> >
> > bpo kernel inside guests (which would give updated virtio drivers),
> > not on proxmox host! (maybe isn't too easy to install a new kernel
> > when VM actually aren't booting)
> >
> > If even with ide root mounting fails, it's probably something broken in your
> host storage configuration, not qemu-kvm or proxmox related.
> >
> > --
> > Giovanni Toraldo
> > http://www.libersoft.it/
> >
> > _______________________________________________
> > pve-user mailing list
> > pve-user at pve.proxmox.com
> > http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user
> 
> 
> --
> ==========================================================
> Alain Péan - LPP/CNRS
> Administrateur Système/Réseau
> Laboratoire de Physique des Plasmas - UMR 7648 Observatoire de Saint-Maur
> 4, av de Neptune, Bat. A
> 94100 Saint-Maur des Fossés
> Tel : 01-45-11-42-39 - Fax : 01-48-89-44-33
> ==========================================================
> 
> _______________________________________________
> pve-user mailing list
> pve-user at pve.proxmox.com
> http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user
> _______________________________________________
> pve-user mailing list
> pve-user at pve.proxmox.com
> http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user