RE: [Xen-users] flat file system as disk

["Pallab Chakrabarty" <pchakrabarty@xxxxxxxxxxxxxxx>]

Thanks for the reply, however,

I'm getting this while changed to file-system..

switchroot: mount failed: No such file or directory
Kernel panic - not syncing: Attempted to kill init!

========
kernel = "/boot/vmlinuz-2.6.18-128.1.14.el5xen"
ramdisk = "/opt/pallab/initrd-2.6.18-128.1.14.el5xen-no-scsi.img"
memory = 1024
name = "centos"
vif = [ 'mac=00:16:3e:21:f1:31,bridge=eth0' ]
dhcp = "dhcp"
disk = ['tap:aio:/tmp/pallab,sda1,w', 'phy:/dev/xen_vg/lv-swap,sda2,w' ]
root = "/dev/sda1 ro"
============

but the image works well with:

========
kernel = "/boot/vmlinuz-2.6.18-128.1.14.el5xen"
ramdisk = "/opt/pallab/initrd-2.6.18-128.1.14.el5xen-no-scsi.img"
memory = 1024
name = "centos"
vif = [ 'mac=00:16:3e:21:f1:31,bridge=eth0' ]
dhcp = "dhcp"
disk = ['tap:aio:/tmp/centos.img,sda1,w', 'phy:/dev/xen_vg/lv-swap,sda2,w'
]
root = "/dev/sda1 ro"
============


Pls advice,

- regards
   Pallab




-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Fajar A.
Nugraha
Sent: Wednesday, June 24, 2009 8:21 AM
To: Xen User-List
Subject: Re: [Xen-users] flat file system as disk

On Wed, Jun 24, 2009 at 9:32 AM, Pallab
Chakrabarty<pchakrabarty@xxxxxxxxxxxxxxx> wrote:
> I want to use a flat file system as disk instead of an image, like:
>
>   disk = ['file:/tmp/server,sda1,w', ? ]
>
>
> Pls advice if this is doable ..

It's doable, with some caveats:
- consistency-wise, file: is not recommended. You should use tap:aio:
- mapping as sda1 instead of sda means you need to use templates (like
from jailtime.org). You won't be abe to use installer (like with
virt-manager).
- I/O performance will be slower compared to block-based vbd using phy:/

--
Fajar

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