[PVE-User] Problems with 1.8

[Gusek, Michael]

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 there be disadvantages by using "cache=writethrough" ?

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/
>
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> pve-user mailing list
> pve-user at pve.proxmox.com
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-- 
==========================================================
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
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