Re: [Xen-users] Re: iSCSI in guest domains

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Tue, Oct 24, 2006 at 03:33:38PM -0700, Michael Leatherman wrote:
> Thanks for the response.  I'm still encountering issues with iSCSI - maybe
> an extra hint or two will get me over the hump.
> 
> I'm trying to compile open-scsi in my domU virtual domain -
> Here are the versions -
> 
> open-iscsi-1.0-485
> 2.6.16-xenU
> 

Don't use 1.0-485, use latest SVN version (2.0-something).

And be sure to use the compiled modules from open-iscsi tree.. not the ones
already in kernel.

So after you install the modules to /lib/modules/<version>, check that you
don't have the modules in two places.. remove the ones that come with the
kernel and run "depmod -a". If I remember correctly, open-iscsi does not
overwrite the modules already in the kernel, but installs copies to another
location which can cause problems (modprobe loads the original modules, not
the newly compiled ones).

-- Pasi


> Nothing was done on the dom0 kernel or in the dom0 domain.  All actions were
> performed in domU.
> 
> 
> To configure Xen domU kernel, I performed the following:
> nfs mounted the Xen source files (3.0.2-2) in the /Xen mount point, modified
> the Makefile  with
> KERNELS ?= linux-2.6-xenU
> 
> I then ran "make world", which created the linux-2.6.16-xenU directory.   I
> modifed the linux-2.6.16-xenU/.config file with my required changes,
> inluding enabling the iSCSI over TCP (CONFIG_ISCSI_TCP=m).  After these
> changes, I ran make, make install and created the
> vmlinuz-2.6.16-xenUfile.  I copied this to my xen host (domain), and
> booted a new domU with
> this newly created kernel file.
> 
> To attempt to create the open-isci module, I did the following:
> Once my domU server came online, I remounted the Xen source files  on the
> domU vm,  then changed directories to /tmp/open-iscsi-1.0-485
> 
> I ran:
> 
> make KSRC=/XEN/linux-2.6.16-xenU
> 
> it appears to compile successfully - here's what I see
> 
> make -C usr
> make[1]: Entering directory `/tmp/open-iscsi-1.0-485/usr'
> make[1]: Nothing to be done for `all'.
> make[1]: Leaving directory `/tmp/open-iscsi-1.0-485/usr'
> make -C kernel
> make[1]: Entering directory `/tmp/open-iscsi-1.0-485/kernel'
> kernel check... OTHER KERNEL DETECTED
> make -C /XEN/linux-2.6.16-xenU M=`pwd`  V=0 modules
> make[2]: Entering directory `/XEN/linux-2.6.16-xenU'
>  Building modules, stage 2.
>  MODPOST
> make[2]: Leaving directory `/XEN/linux-2.6.16-xenU'
> make[1]: Leaving directory `/tmp/open-iscsi-1.0-485/kernel'
> 
> Compilation complete                Output file
> ----------------------------------- ----------------
> Built iSCSI Open Interface module:  kernel/scsi_transport_iscsi.ko
> Built iSCSI over TCP kernel module: kernel/iscsi_tcp.ko
> Built iSCSI daemon:                 usr/iscsid
> Built management application:       usr/iscsiadm
> 
> Read README file for detailed information.
> 
> However, when I attempt to load the iscsi_tcp.ko or scsi_transport_iscsi.ko
> modules in domU, I get errors -
> 
> FATAL: Error inserting scsi_transport_iscsi
> (/lib/modules/2.6.16-xenU/kernel/drivers/scsi/scsi_transport_iscsi.ko):
> Unknown symbol i
> n module, or unknown parameter (see dmesg)
> 
> 
> dmesg shows -
> 
> scsi_transport_iscsi: Unknown symbol scsi_remove_host
> scsi_transport_iscsi: Unknown symbol scsi_host_get
> scsi_transport_iscsi: Unknown symbol scsi_host_put
> scsi_transport_iscsi: Unknown symbol scsi_add_host
> scsi_transport_iscsi: Unknown symbol scsi_is_host_device
> scsi_transport_iscsi: Unknown symbol scsi_host_alloc
> 
> 
> Did I miss a step, or run a step incorrectly.  I realize this email is very
> long, but I wanted to include as much detail as possible.  Thanks in
> advance.
> 
> - Michael
> 
> 
> 
> 
> On 10/19/06, Mike Leatherman <michael.leatherman@xxxxxxxxx> wrote:
> >
> >
> >Hi,
> >I'm trying to install Oracle 10g RAC using xen virtual servers and a
> >Network Appliance F880 filer as the shared storage. I'm using Xen 3.0.2,
> >kernel version 2.6.16u, and my VBD is created from a Redhat 4u3
> >distribution.  I would like to use raw devices (disk LUNs on the NetApp
> >filer) in conjunction with Oracle ASM to store the oracle database files.
> >This configuration works well on standard linux servers, but I'm unable to
> >get it working on Xen because I can't get the iSCSI initiator to work in
> >the guest domains.
> >
> >I attempted to compile the core-iscsi initiator against the 2.6.16U
> >kernel, and it seems to compile ok, but I get "unknown symbol in module"
> >error when I attempt to load via insmod in the guest domain. I tried
> >open-scsi as well, but also receive errors.
> >
> >So my question is -
> >
> >can you launch the iscsi-initiator and deamons within the guest domain to
> >establish iscsi connetivity to the iSCSI target (netapp filer), or does
> >iscsi have to be started on the xen host (dom0).  If iSCSI can be launched
> >from the guest, which initiator should I use with the 2.6.16U kernel, and
> >are there any tips on how to compile this initiator to work with Xen ?
> >
> >Thanks in advance.
> >
> >

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