Re: [Xen-users] Is RAMDISK required for domU boot?

["Itamar Reis Peixoto" <itamar@xxxxxxxxxxxxxxxx>]

the best solution for this problem is mount the domU disk on /mnt and do
this command.

for i in console null zero ; do MAKEDEV -d /mnt/dev -x $i ; done

if you're running a new distro, remember to install udev on domU




--------------------

Itamar Reis Peixoto

e-mail: itamar@xxxxxxxxxxxxxxxx
msn: itamarjp@xxxxxxxxxxxxx
skype: itamarjp
icq: 81053601
+55 34 3238 3845
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Subject: RE: [Xen-users] Is RAMDISK required for domU boot?


> From the log, the real reason is because:
[...
Warning: unable to open an initial console.
...]

An solution is to mount your domU harddisk firstly, then copy your
Xen0:/dev/* to domU:/dev/

After above 2 steps, that domU should be created without Ramdisk option.
Well, Ramdisk is harmless. :)

> I found one weird thing: I heard RAMDISK is not required for domU, but it
> seems I have to add RAMDISK to my domU config file, otherwiese the domU
> will hang up when it is booting. Please see the message below, the domU
> booting hangs up after "Continuing..."
>
> Does anyone have any clue for this issue? BTW, xen-friendly glibc is
> already
> installed.
>
> Thanks,
>
> Liang
>
> ---Begin of  domU boot message---------------------------------
> xen]# xm create domain1.xm -c
> Using config file "domain1.xm".
> Started domain domain1
> Linux version 2.6.16-xen (root@xxxxxxxxxxxxxxxxxxxxx) (gcc version 3.4.6
> 20060404 (Red Hat 3.4.6-3)) #1 SMP Fri Sep 8 18:40:45 MST 2006
> BIOS-provided physical RAM map:
> Xen: 0000000000000000 - 0000000020000000 (usable)
> 0MB HIGHMEM available.
> 520MB LOWMEM available.
> ACPI in unprivileged domain disabled
> IRQ lockup detection disabled
> Built 1 zonelists
> Kernel command line:  ip=:1.2.3.4::::eth0:dhcp root=/dev/sda1 ro 3
> Enabling fast FPU save and restore... done.
> Enabling unmasked SIMD FPU exception support... done.
> Initializing CPU#0
> PID hash table entries: 4096 (order: 12, 65536 bytes)
> Xen reported: 2666.662 MHz processor.
> Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
> Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
> Software IO TLB disabled
> vmalloc area: e1000000-fb7fe000, maxmem 33ffe000
> Memory: 514048k/532480k available (2250k kernel code, 9780k reserved,
> 708k
> data, 172k init, 0k highmem)
> Checking if this processor honours the WP bit even in supervisor mode...
> Ok.
> Calibrating delay using timer specific routine.. 5334.98 BogoMIPS
> (lpj=26674902)
> Security Framework v1.0.0 initialized
> Capability LSM initialized
> Mount-cache hash table entries: 512
> CPU: L1 I cache: 32K, L1 D cache: 32K
> CPU: L2 cache: 4096K
> CPU: L3 cache: 4096K
> Checking 'hlt' instruction... OK.
> Brought up 1 CPUs
> migration_cost=0
> Grant table initialized
> NET: Registered protocol family 16
> Brought up 1 CPUs
> PCI: setting up Xen PCI frontend stub
> ACPI: Subsystem revision 20060127
> ACPI: Interpreter disabled.
> Linux Plug and Play Support v0.97 (c) Adam Belay
> xen_mem: Initialising balloon driver.
> usbcore: registered new driver usbfs
> usbcore: registered new driver hub
> PCI: System does not support PCI
> PCI: System does not support PCI
> IA-32 Microcode Update Driver: v1.14-xen <tigran@xxxxxxxxxxx>
> VFS: Disk quotas dquot_6.5.1
> Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
> Initializing Cryptographic API
> io scheduler noop registered
> io scheduler anticipatory registered (default)
> io scheduler deadline registered
> io scheduler cfq registered
> PNP: No PS/2 controller found. Probing ports directly.
> i8042.c: No controller found.
> RAMDISK driver initialized: 16 RAM disks of 16384K size 1024 blocksize
> Xen virtual console successfully installed as tty1
> Event-channel device installed.
> blkif_init: reqs=64, pages=704, mmap_vstart=0xdf800000
> netfront: Initialising virtual ethernet driver.
> Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
> ide: Assuming 50MHz system bus speed for PIO modes; override with
> idebus=xx
> Registering block device major 8
> ide-floppy driver 0.99.newide
> usbmon: debugfs is not available
> usbcore: registered new driver libusual
> mice: PS/2 mouse device common for all mice
> NET: Registered protocol family 2
> IP route cache hash table entries: 32768 (order: 5, 131072 bytes)
> TCP established hash table entries: 131072 (order: 8, 1048576 bytes)
> TCP bind hash table entries: 65536 (order: 7, 524288 bytes)
> TCP: Hash tables configured (established 131072 bind 65536)
> TCP reno registered
> Initializing IPsec netlink socket
> NET: Registered protocol family 1
> NET: Registered protocol family 17
> NET: Registered protocol family 8
> NET: Registered protocol family 20
> Using IPI No-Shortcut mode
> EXT2-fs warning (device sda1): ext2_fill_super: mounting ext3 filesystem as
> ext2
> VFS: Mounted root (ext2 filesystem) readonly.
> Freeing unused kernel memory: 172k freed
> Warning: unable to open an initial console.
>
>  ***************************************************************
>  ***************************************************************
>  ** WARNING: Currently emulating unsupported memory accesses  **
>  **          in /lib/tls glibc libraries. The emulation is    **
>  **          slow. To ensure full performance you should      **
>  **          install a 'xen-friendly' (nosegneg) version of   **
>  **          the library, or disable tls support by executing **
>  **          the following as root:                           **
>  **          mv /lib/tls /lib/tls.disabled                    **
>  ** Offending process: init (pid=1)                           **
>  ***************************************************************
>  ***************************************************************
>
> Continuing...
>
> --End of domU boot message----------------------------------------
>
> ---Begin of my domU config file--------------------
> kernel = "/boot/vmlinuz-2.6-xenU"
> ramdisk = "/boot/initrd-2.6-xen.img"
> memory = 512
> name = "domain1"
> extra = "3"
> vif = [ 'bridge=xenbr0' ]
> dhcp = "dhcp"
> disk = ['phy:/dev/VG_Dom6_Linux/LogVol00,sda1,w' ]
> root = "/dev/sda1 ro"
>
> ---End of my domU config file--------------------


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