[Xen-users] Re: iSCSI in guest domains

["Michael Leatherman" <michael.leatherman@xxxxxxxxx>]

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

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-xenU file.  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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