Re: [Xen-users] iSCSI root on Dom0

["Joe Royall" <joenukem@xxxxxxxxx>]

On Wed, Apr 2, 2008 at 11:55 AM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:

On Wed, Apr 02, 2008 at 10:41:01AM -0400, Tait Clarridge wrote:
> Hello,
>
> In my experience, I have noticed that iSCSI is never brought up
> properly. On a box we have running Xen 3.1 and Centos 5.0 the iSCSI
> mount needs to be brought up manually after it fails to load on boot. I
> don't have a working solution, just trying to point you in a direction.
>
> Probably happens for us here because the box tries to bring up the iSCSI
> before trying to bring up the NICS.
>
> Anyways, just thought I'd add my two cents.
>

I'll add my two cents too..

Upcoming RHEL 5.2 (and CentOS 5.2) should support software iSCSI root using iBFT
information.. if your BIOS/NIC/whatnot support iBFT and fills up the iBFT table
before booting the OS then initrd image is able to configure iSCSI root using the
IP/LUN information on the iBFT table.

See RHEL 5.2 beta announcement for more information..

I think this would make the problem go away and a lot of others.  Do you know of any GBE nics that support this?

-- Pasi

> Cheers,
> Tait
>
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Ross S. W.
> Walker
> Sent: Monday, March 31, 2008 5:01 PM
> To: Joe Royall; xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-users] iSCSI root on Dom0
>
> Joe Royall wrote:
> >
> > I am getting the following error on boot on a new install Centos 51:
> >
> > #/bin/sh ro no such file or directory
> > then a kernel panic
> >
> > I have traced it to the call 'switchroot' in the init script
> > in the initrd.
> >
> > the exact same build without zen has no problems.
> >
> > the boot messages look like:
> >
> > Attaching to iSCSI storage
> > iscsistart: transport class version 2.0-724. iscsid version 2.0-865
> > iscsistart: version 2.0-865
> > scsi0 : iSCSI Initiator over TCP/IP
> > iscsistart: connection1:0 is operational now
> >     Vendor: IET    Model: Controler    Rev: 0001
> >     Type: RAID                ANSI SCSI revision: 05
> >     Vendor    Model: VIRTUAL-DISK    Rev: 0001
> >     Type:    Direct -Access        ANSI SCSI revision: 05
> > SCSI device sda: 20971520 512-byte hdwr sectors (10737 MB)
> > sda: Write Protect is off
> > SCSI device sda: drive cache: write back
> > SCSI device sda: 20971520 512-byte hdwr sectors (10737 MB)
> > sda: Write Protect is off
> > SCSI device sda: drive cache: write back
> >     sda: sda1
> > sd 0:0:0:1: Attached scsi disk sda
> > Waiting for driver initialization
> > Scanning and configuring dmraid supported devices
> > Create root device
> > Mounting root filesystem.
> > kjournaled starting. Commit interval 5 seconds
> > EXT3-fs: mounted filesystem with orded data mode.
> > Setting up other filesystems.
> > Setting up new root fs
> > no fstab.sys, mounting internal defaults
> > Copying DHCP lease
> > Switching to new root and running init
> > #/bin/sh ro no such file or directory
> >
> >
> > /tftpboot/pxelinux.cfg/default .....
> >
> >
> > default iscsi_root_xen
> > prompt 0
> >
> > label manual_install
> >         KERNEL /Centos/51/kickstart/vmlinuz
> >         APPEND initrd=/Centos/51/kickstart/initrd.img
> >
> > label kickstart_xen
> >         KERNEL /Centos/51/kickstart/vmlinuz
> >         APPEND initrd=/Centos/51/kickstart/initrd.img
> > ks=http://192.168.1.202/anaconda-ks.cfg ksdevice=link noipv6
> >
> > label kickstart_noxen
> >         KERNEL /Centos/51/kickstart/vmlinuz
> >         APPEND initrd=/Centos/51/kickstart/initrd.img
> > ks=http://192.168.1.202/anaconda-ks.noxen.cfg ksdevice=link noipv6
> >
> > label iscsi_root_xen
> >         KERNEL mboot.c32
> >         APPEND /Centos/boot/xen.gz-2.6.18-53.el5 ---
> > /Centos/boot/vmlinuz-2.6.18-53.el5xen ro root=LABEL=/ noipv6
> > --- /Centos/boot/initrd-2.6.18-53.el5xen.img
> >
> >
> > label iscsi_root_noxen
> >   KERNEL /Centos/boot/vmlinuz-2.6.18-53.el5
> >   APPEND initrd=/Centos/boot/initrd-2.6.18-53.el5.img ro
> > root=LABEL=/  noipv6
> >
> >
> > the xen and the noxen have different iscsi partitions and
> > only one is activated at a time.
> >
> > the xen and noxen kickstarts are the same execpt the xen
> > includes the package @Virtualization
> >
> > Any ideas?
>
> I suggest starting out by looking at the kernel configs for
> both versions to see if anything differs besides the Xen
> options. Maybe upstream forgot to compile it the iSCSI
> support into the Xen kernel?
>
> -Ross
>

-- 
Joe Royall
407-401-2007
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