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Re: [Xen-users] Virtual SCSI



On Sun, Mar 14, 2010 at 02:30:58PM +0100, Paolo Rivetti wrote:
>        I'm trying to assign 2 SATA devices to a PV guest.
> 
>        Command lsscsi:
> 
>        [0:0:0:0] disk ATA WDC WD3200AAJS-0 12.0 / dev / sda
> 
>        [2:0:0:0] disk ATA WDC WD10EADS-00L 01.0 / dev / sdb
> 
>        [3:0:0:0] disk ATA WDC WD10EADS-00L 01.0 / dev / sdc
> 
>        Therefore my configuration:
> 
>        vscsi = [ '/ dev / sdb, 2:0:0:0', '/ dev / sdc, 3:0:0:0']
> 
>        The PV guest starts correctly but there are no disks sdb and sdc.
> 
>        Where am I wrong? Thanks
> 
>      There shouldn't be spaces between the '/'s. Are they just an artefact of
>      the cut & paste to email?
> 
>    It was only a mistake of copy pasting. This is my configuration:
>    name = "of0"
>    memory = "512"
>    disk = [ 'phy:/dev/vg1/of0,xvda,w' ]
>    #, 'phy:/dev/sdb,xvdb,w', 'phy:/dev/sdc,xvdc,w' ]
>    vif = [ 'mac=00:01:4F:FC:00:00,bridge=xenbr0' ]
>    bootloader="/usr/bin/pygrub"
>    vcpus=2
>    on_reboot = 'restart'
>    on_crash = 'restart'
>    kernel="/boot/vmlinuz-2.6.18-164.el5xen"
>    root ="/dev/xvda ro"
>    vscsi = [ '/dev/sdb, 2:0:0:0', '/dev/sdc, 3:0:0:0' ]
> 
>      Other things to consider:
>      1. is the pvscsi module loaded? Is it definitely supported by your
>      version of xen? The fact that it silently doesn't do anything is
>      suspicious
> 
>    What is the module to load? With the command "dmesg | grep pvscsi" prompt
>    returns nothing. How can I check if the version of Xen supports this
>    module? My version is this:
>    xen-3.0.3-94.el5
>    xen-libs-3.0.3-94.el5
>    kernel-xen-2.6.18-164.el5
>

I don't think RHEL5 version of Xen has PVSCSI support.

You need to have the pvscsi backend driver (scsiback) in dom0 kernel, 
and the pvscsi frontend driver (scsifront) in the domU kernel.

Also Xen tools in dom0 need to have the support for handling PVSCSI.
iirc PVSCSI first appeared on Xen 3.3.0.
 
-- Pasi


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