Hi,
When i boot into my xen-linux2.6.11.10 kernel and give the command
xend start i get the following message
>
> [root@tfrc1 ~]# xend start
> Traceback (most recent call last):
> File "/usr/sbin/xend", line 27, in ?
> from xen.xend.server import SrvDaemon
> File "/auto/groups/xeno-xenod/users/xenod/cron-build/R24768.dir/xen-
> 2.0.bk/dist/install/usr/lib/python/xen/xend/server/SrvDaemon.py", line 20,
> in ?
> ImportError: No module named twisted.internet
> [root@tfrc1 ~]#
>
> Please suggest what to do.
>
> Thanks
> Sriram
On Tue, 21 Jun 2005 06:48:20 -0400 (EDT), xen-users-request wrote
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> Today's Topics:
>
> 1. Re: Stable VBD Types (Nils Toedtmann)
> 2. Kernel panic, unable to mount rootfs (Matthew J. Harmon)
> 3. Re: Kernel panic, unable to mount rootfs (Matthew J. Harmon)
> 4. Re: Re: Kernel panic, unable to mount rootfs (Yvette Chanco)
> 5. big sized applications in XEN virtual machine (Andre Kuester)
> 6. Re: big sized applications in XEN virtual machine
> (Fajar A. Nugraha)
>
> 7. Re: big sized applications in XEN virtual machine (Wim
> Coekaerts)
> 8. Re: big sized applications in XEN virtual machine
> (Fajar A. Nugraha)
> 9. Re: Xen Install (James Bulpin)
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 21 Jun 2005 00:10:33 +0200
> From: Nils Toedtmann <xen-users@xxxxxxxxxxxxxxxxxx>
> Subject: Re: [Xen-users] Stable VBD Types
> To: mail@xxxxxxxxxxxxxxxx
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Message-ID: <1119305434.3840.6.camel@xxxxxxxxxxxxxxxxxxxxxxx>
> Content-Type: text/plain
>
> Am Montag, den 20.06.2005, 18:11 +0100 schrieb [GDPR REDACTED]:
> [...]
> > Thanks. Although this is relevent to what I'm wanting to do, what I
> > meant to say was using lvm snapshots as a way to reduce common files
> > from repeating on disk. I quote the LVM-HowTo as it explains it a little
> > better.
> >
> > "It is also useful for creating volumes for use with Xen. You can create
> > a disk image, then snapshot it and modify the snapshot for a particular
> > domU instance. You can then create another snapshot of the original
> > volume, and modify that one for a different domU instance. Since the
> > only storage used by a snapshot is blocks that were changed on the
> > origin or the snapshot, the majority of the volume is shared by the
> > domU's."
> [...]
>
> We use the device-mapper for this. Works for us [tm]:
>
> dd if=/dev/zero of=/tmp/CoW1 bs=1M count=$CoW_SIZE
> dd if=/dev/zero of=/tmp/CoW2 bs=1M count=$CoW_SIZE
>
> losetup /dev/loop0 root_fs
> losetup /dev/loop1 /tmp/CoW1
> losetup /dev/loop2 /tmp/CoW2
>
> BLOCKSIZE=`blockdev --getsize /dev/loop0`
>
> echo "0 $BLOCKSIZE linear /dev/loop0
> 0" \ | dmsetup create rootfs_base
>
> echo "0 $BLOCKSIZE snapshot /dev/mapper/rootfs_base /dev/loop1 p
> 8" \ | dmsetup create rootfs1
>
> echo "0 $BLOCKSIZE snapshot /dev/mapper/rootfs_base /dev/loop2 p
> 8" \ | dmsetup create rootfs2
>
> You should now be able to use /dev/mapper/rootfs{1|2} read/write.
> Only diff blocks to "root_fs" get written to "/tmp/CoW{1|2}".
>
> This way we boot >20 domUs off one root_fs (after shutdown we delete
> the CoW files). I have now clue how to do that with LVM[2].
>
> /nils.
>
> --
> there is no sig
>
> ------------------------------
>
> Message: 2
> Date: Mon, 20 Jun 2005 17:56:17 -0500 (CDT)
> From: "Matthew J. Harmon" <mjh@xxxxxxxx>
> Subject: [Xen-users] Kernel panic, unable to mount rootfs
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Message-ID: <Pine.LNX.4.62.0506201748260.32722@xxxxxxxxxxxxx>
> Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
>
> Alright, thank you for the "noreboot" kernel option!
>
> Here is the full err:
>
> Root-NFS: No NFS server available, giving up.
> VFS: Unable to mount root fs via NFS, trying floppy.
> VFS: Cannot open root device "sda2" or unknown-block(2,0)
> Please append a correct "root=" boot option
> Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(2,0)
>
> Doing a bit of research on the error message, found the following
> threads on xen-devel: http://lists.xensource.com/archives/html/xen-
> devel/2004-10/msg00382.html
> http://lists.xensource.com/archives/html/xen-devel/2004-12/msg00470.html
>
> I'm thinking this might not be a xen problem, but a grub problem?
>
> Still working on the issue, any tips would be appreciated.
>
> Thanks.
>
> -Matthew
>
> ------------------------------
>
> Message: 3
> Date: Mon, 20 Jun 2005 18:13:22 -0500 (CDT)
> From: "Matthew J. Harmon" <mjh@xxxxxxxx>
> Subject: [Xen-users] Re: Kernel panic, unable to mount rootfs
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Message-ID: <Pine.LNX.4.62.0506201811200.32722@xxxxxxxxxxxxx>
> Content-Type: TEXT/PLAIN; charset=US-ASCII
>
> Additionally, the menu.lst for grub is as follows:
>
> title Debian GNU/Linux, Xen 2.6.11xen0, testing 2005.06.18
> kernel=/xen.gz dom0_mem=32768 noreboot
> root (hd0,0)
> module=(hd0,0)/xen-linux-2.6.11charliexen0 root=/dev/sda2 ro
> console=tty0 console=ttyS0 showopts selinux=0
> ### BEGIN AUTOMAGIC KERNELS LIST
> ###[snip - all default]
>
> -M
>
> On Mon, 20 Jun 2005, Matthew J. Harmon wrote:
>
> Alright, thank you for the "noreboot" kernel option!
>
> Here is the full err:
>
> Root-NFS: No NFS server available, giving up.
> VFS: Unable to mount root fs via NFS, trying floppy.
> VFS: Cannot open root device "sda2" or unknown-block(2,0)
> Please append a correct "root=" boot option
> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-
> block(2,0)
>
> Doing a bit of research on the error message, found the following
> threads on xen-devel: http://lists.xensource.com/archives/html/xen-
> devel/2004-10/msg00382.html
> http://lists.xensource.com/archives/html/xen-devel/2004-12/msg00470.html
>
> I'm thinking this might not be a xen problem, but a grub problem?
>
> Still working on the issue, any tips would be appreciated.
>
> Thanks.
>
> -Matthew
>
> ------------------------------
>
> Message: 4
> Date: Mon, 20 Jun 2005 19:28:02 -0500
> From: Yvette Chanco <yentlsoup@xxxxxxxxx>
> Subject: Re: [Xen-users] Re: Kernel panic, unable to mount rootfs
> To: "Matthew J. Harmon" <mjh@xxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
> Message-ID: <cda40682050620172815c07bc6@xxxxxxxxxxxxxx>
> Content-Type: text/plain; charset=ISO-8859-1
>
> If you're getting that far (to starting the dom0) then grub might not
> directly be the issue. I got that error message when I was using a
> kernel (for dom0) that hadn't been compiled with support for my scsi
> adapter. From the looks of your menu.lst, though, it seems you
> probably did a custom build, so you would know what you included. My
> only other guess is if there is an initrd image you haven't put in
> the grub configuration?
>
> On 6/20/05, Matthew J. Harmon <mjh@xxxxxxxx> wrote:
> > Additionally, the menu.lst for grub is as follows:
> >
> > title Debian GNU/Linux, Xen 2.6.11xen0, testing 2005.06.18
> > kernel=/xen.gz dom0_mem=32768 noreboot
> > root (hd0,0)
> > module=(hd0,0)/xen-linux-2.6.11charliexen0 root=/dev/sda2 ro console=tty0
> > console=ttyS0 showopts selinux=0
> > ### BEGIN AUTOMAGIC KERNELS LIST
> > ###[snip - all default]
> >
> > -M
> >
> > On Mon, 20 Jun 2005, Matthew J. Harmon wrote:
> >
> > Alright, thank you for the "noreboot" kernel option!
> >
> > Here is the full err:
> >
> > Root-NFS: No NFS server available, giving up.
> > VFS: Unable to mount root fs via NFS, trying floppy.
> > VFS: Cannot open root device "sda2" or unknown-block(2,0)
> > Please append a correct "root=" boot option
> > Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block
(2,0)
> >
> > Doing a bit of research on the error message, found the following threads
on
> > xen-devel:
> > http://lists.xensource.com/archives/html/xen-devel/2004-10/msg00382.html
> > http://lists.xensource.com/archives/html/xen-devel/2004-12/msg00470.html
> >
> > I'm thinking this might not be a xen problem, but a grub problem?
> >
> > Still working on the issue, any tips would be appreciated.
> >
> > Thanks.
> >
> > -Matthew
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> >
>
> --
> -Yvette Chanco
> www.option-c.com
>
> ------------------------------
>
> Message: 5
> Date: Tue, 21 Jun 2005 04:04:45 +0200
> From: Andre Kuester <andre.kuester@xxxxxxxxx>
> Subject: [Xen-users] big sized applications in XEN virtual machine
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Message-ID: <4ee1f99605062019041832dc70@xxxxxxxxxxxxxx>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Hi,
>
> recently I discovered the exsistance of Xen. I looked a bit around
> and feel quite impressed by this solution. Then an idea came to my
> mind, having a partition for a more or less stable server and one
> for my bleeding edge desktop playground. I think I am not the only
> one with that ;) But I dont want to use the typical lamp server
> config, I thought more about a massive database server, such as DB2
> together with a recent version of SAP Netweaver. Both of them are
> quite memory and of course IO-hungry. I have decent hardware to run
> that, but I couldnt found any experience report about such a xen-DB2-
> SAP combination. So I ask you, if there are any experiences with
> that. In special I ask myself, how the removal of the TLS libraries might
> affect performance and stability of those applications.
> (Preferred OS is RHEL4)
>
> I would be glad to hear some hints or experiences.
>
> Thanks & Regards,
> Andre.
>
> ------------------------------
>
> Message: 6
> Date: Tue, 21 Jun 2005 10:19:28 +0700
> From: "Fajar A. Nugraha" <fajar@xxxxxxxxxxxxx>
> Subject: Re: [Xen-users] big sized applications in XEN virtual
> machine To: xen-users@xxxxxxxxxxxxxxxxxxx Message-ID:
<42B78740.20401@xxxxxxxxxxxxx>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Andre Kuester wrote:
>
> >So I ask you, if there are any experiences
> >with that. In special I ask myself, how the removal of the TLS libraries
might
> >affect performance and stability of those applications.
> >(Preferred OS is RHEL4)
> >
> >
> >
> I tried using Oracle 10g on a rather old version of Xen from bk (it
> still uses kernel 2.6.9) with Lineox 4.
> TLS libs (/lib/tls, /usr/lib/tls, /usr/X11r6/lib/tls) moved out of
> the way. This configuration works great running MTA (mail filtering
> purposes) and web server (LAMP). However it didn't work quite as
> expected running Oracle. Oracle runs, but often I would get entries
> like these on alert log :
>
> ORA-07445: exception encountered: core dump [kkogbro()+2832]
> [SIGSEGV] [Address not mapped to object] [0x0] [] [] ORA-00600:
> internal error code, arguments: [kghssgai2], [1], [36], [], [], [],
> [], [] ORA-00600: internal error code, arguments: [kghssgai2], [1],
> [20], [], [], [], [], [] ORA-07445: exception encountered: core dump
> [kkogbro()+2832] [SIGSEGV] [Address not mapped to object] [0x0] []
> [] ORA-00600: internal error code, arguments: [kghssgai2], [5], [36],
> [], [], [], [], [] ORA-07445: exception encountered: core dump
> [kkogbro()+2832] [SIGSEGV] [Address not mapped to object] [0x0] []
> [] ORA-07445: exception encountered: core dump [kkogbro()+2832]
> [SIGSEGV] [Address not mapped to object] [0x0] [] [] ORA-00600:
> internal error code, arguments: [kghssgai3], [128], [20], [], [], [],
> [], [] ORA-00600: internal error code, arguments: [kghssgai2], [5],
> [20], [], [], [], [], []
>
> and sometimes it just dies.
> Revert back to native linux, everything works fine.
>
> I haven't had time to test current Xen 2.0.6 (or nightly snapshot) though.
>
> Regards,
>
> Fajar
>
> ------------------------------
>
> Message: 7
> Date: Mon, 20 Jun 2005 20:36:03 -0700
> From: Wim Coekaerts <wim.coekaerts@xxxxxxxxxx>
> Subject: Re: [Xen-users] big sized applications in XEN virtual
> machine To: "Fajar A. Nugraha" <fajar@xxxxxxxxxxxxx> Cc: xen-
users@xxxxxxxxxxxxxxxxxxx
> Message-ID: <20050621033602.GA4554@xxxxxxxxxxxxxxxxxxxxxxxx>
> Content-Type: text/plain; charset=us-ascii
>
> ve had it running for quite some time without problems. even the middle
> tier stack.
>
> been pretty solid
>
> On Tue, Jun 21, 2005 at 10:19:28AM +0700, Fajar A. Nugraha wrote:
> > Andre Kuester wrote:
> >
> > >So I ask you, if there are any experiences
> > >with that. In special I ask myself, how the removal of the TLS libraries
> > >might
> > >affect performance and stability of those applications.
> > >(Preferred OS is RHEL4)
> > >
> > >
> > >
> > I tried using Oracle 10g on a rather old version of Xen from bk (it
> > still uses kernel 2.6.9) with Lineox 4.
> > TLS libs (/lib/tls, /usr/lib/tls, /usr/X11r6/lib/tls) moved out of the
way.
> > This configuration works great running MTA (mail filtering purposes) and
> > web server (LAMP).
> > However it didn't work quite as expected running Oracle.
> > Oracle runs, but often I would get entries like these on alert log :
> >
> > ORA-07445: exception encountered: core dump [kkogbro()+2832] [SIGSEGV]
> > [Address not mapped to object] [0x0] [] []
> > ORA-00600: internal error code, arguments: [kghssgai2], [1], [36], [],
> > [], [], [], []
> > ORA-00600: internal error code, arguments: [kghssgai2], [1], [20], [],
> > [], [], [], []
> > ORA-07445: exception encountered: core dump [kkogbro()+2832] [SIGSEGV]
> > [Address not mapped to object] [0x0] [] []
> > ORA-00600: internal error code, arguments: [kghssgai2], [5], [36], [],
> > [], [], [], []
> > ORA-07445: exception encountered: core dump [kkogbro()+2832] [SIGSEGV]
> > [Address not mapped to object] [0x0] [] []
> > ORA-07445: exception encountered: core dump [kkogbro()+2832] [SIGSEGV]
> > [Address not mapped to object] [0x0] [] []
> > ORA-00600: internal error code, arguments: [kghssgai3], [128], [20], [],
> > [], [], [], []
> > ORA-00600: internal error code, arguments: [kghssgai2], [5], [20], [],
> > [], [], [], []
> >
> > and sometimes it just dies.
> > Revert back to native linux, everything works fine.
> >
> > I haven't had time to test current Xen 2.0.6 (or nightly snapshot) though.
> >
> > Regards,
> >
> > Fajar
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
>
> ------------------------------
>
> Message: 8
> Date: Tue, 21 Jun 2005 11:04:13 +0700
> From: "Fajar A. Nugraha" <fajar@xxxxxxxxxxxxx>
> Subject: Re: [Xen-users] big sized applications in XEN virtual
> machine To: xen-users@xxxxxxxxxxxxxxxxxxx Message-ID:
<42B791BD.6010303@xxxxxxxxxxxxx>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Wim Coekaerts wrote:
>
> >ve had it running for quite some time without problems. even the middle
> >tier stack.
> >
> >been pretty solid
> >
> >
> Oracle 10G? On which version of Xen and which Linux distro?
> I'd like to test it again soon.
>
> Regards,
>
> Fajar
>
> ------------------------------
>
> Message: 9
> Date: Tue, 21 Jun 2005 11:47:48 +0100
> From: James Bulpin <james@xxxxxxxxxxxxx>
> Subject: Re: [Xen-users] Xen Install
> To: sramara@xxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
> Message-ID: <42B7F054.6020900@xxxxxxxxxxxxx>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Please send replies to the list rather than only to me.
>
> Have you installed Twisted?
>
> James
>
> Ramarathnam Sriram wrote:
> > Hi James,
> > Thanks alot for your prompt response.
> > Now when i boot into my xen-linux2.6.11.10 kernel and give the command
> > xend start i get the following message
> >
> > [root@tfrc1 ~]# xend start
> > Traceback (most recent call last):
> > File "/usr/sbin/xend", line 27, in ?
> > from xen.xend.server import SrvDaemon
> > File "/auto/groups/xeno-xenod/users/xenod/cron-build/R24768.dir/xen-
> > 2.0.bk/dist/install/usr/lib/python/xen/xend/server/SrvDaemon.py", line
20,
> > in ?
> > ImportError: No module named twisted.internet
> > [root@tfrc1 ~]#
> >
> > Please suggest what to do.
> >
> > Thanks
> > Sriram
> >
> >
> > On Mon, 20 Jun 2005 17:01:36 +0100, James Bulpin wrote
> >
> >>Ramarathnam Sriram wrote:
> >>
> >>>Hi,
> >>> I am trying to install xen on top of Fedora
> >>>I appended the following lines in menu.lst file
> >>>
> >>> title Xen 2.0 / XenLinux 2.6
> >>> kernel /boot/xen-2.0.gz dom0_mem=131072
> >>> module /boot/vmlinuz-2.6-xen0 root=/dev/sda4 ro console=tty0
> >>
> >>This is direct copy from the user manual without modification for
> >>your own system I suspect.
> >>
> >>
> >>>it gives the following errror
> >>>
> >>>Root-NFS: no NFS server available,giving up
> >>>VFS: Unable to mount root fs via NFS,trying floppy
> >>>VFS: Insert root floppy and press enter
> >>>
> >>>
> >>>And when I press enter I see
> >>>kernel panic (not syncing...)
> >>>(I did not catch the rest)
> >>>and it reboots.
> >>>
> >>>also i tried changing root=/dev/hdc since that is what my root is
> >>>inside /etc/fstab.
> >>
> >>No it isn't, according to your followup email:
> >>
> >> /dev/VolGroup00/LogVol00 / ext3 defaults 1 1
> >>
> >>You'll need an initrd for the kernel to be able to mount this.
> >>
> >>Boot into native Linux and run as root (I'm assuming XenLinux 2.6.11
> >>- substitute your actual version):
> >>
> >> mkinitrd /boot/initrd-2.6.11-xen0.img 2.6.11-xen0
> >>
> >> (you may have to do "depmod -a 2.6.11-xen0" first)
> >>
> >>Append the following line to the Xen entry in your GRUB menu.lst
> >>
> >> module /boot/initrd-2.6.11-xen0.img
> >>
> >>Change the root= option to root=/dev/VolGroup00/LogVol00
> >>
> >>James
> >
> >
> >
>
> ------------------------------
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
>
> End of Xen-users Digest, Vol 4, Issue 61
> ****************************************
Sriram Ramarathnam,
Graduate Student,Computer Science
Clemson University
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