Re: [Xen-devel] iSCSI problems

[Alvin Starr <alvin@xxxxxxxxxx>]

Edwards, Nigel (Nigel Edwards) wrote:

> Hi,
> I am having problems getting iSCSI working with xen. I can access
> iSCSI drives fine from Xen0 (e.g. untar a 500MB archive and I don't
> see problems reported through dmesg or /proc/kmsg). However, if I try
> to project them into an instance of XenU as a scsi device to boot the
> unprivileged domain I get an oops in Xen0 - often resulting in the
> whole machine crashing.  This occurs in the very early stages of boot
> of xenU.
>
> I am using linux-iscsi-4.0.2 for iscsi_sfnet.ko
> scsi_transport_iscsi.ko is being built in linux-2.6.12-xen0
> I downloaded xen-unstable-src.tgz October 25th.
>
> I notice that there appear to be some significant differences between
> scsi_transport_iscsi.c in linux-iscsi-4.0.2 and the version in 
> linux-2.6.12 kernel.
> Example oops below. I have also attached the domain config file. I am
> not sure what to do next to get this working.  Any suggestions would
> be appreciated. If you have iSCSI working, if you could drop me a note
> indicating what code and modules you are using I would be very grateful.
>
> Cheers,
> Nigel.
>  
Having played with this I would suggest that you use iSCSI in Dom0 and 
export the disks from Dom0 to the varios DomU's.
I have managed to get this working with the aid of some hacks to the 
UDEV configuration files so that I can get a deivce entry like 
/dev/magical-iscsi-targetname.my.fun.domain.com.
It is then easy to map these things into the approprate DomU configs.

I would be concerned about using iSCSI in the DomU's because of the 
extra network overhead in propigating the data across the bridge.
--
Alvin Starr                   ||   voice: (416)585-9971
Interlink Connectivity        ||   fax:   (416)585-9974
alvin@xxxxxxxxxx              ||


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