[Xen-devel] Re: VHD BUG in xen4.0 when install windows2008

[yingbin wang <yingbin.wangyb@xxxxxxxxx>]

the install problem is solved.

after install Windows 2008 R2 Standard Edition 64(disk size: 20G, C:\ 15G, D:\ 5G) on vhd file (as base image), os reboot. 

I use command( ps aux | grep tapdisk2 ) to see the status and found that after new tapdisk2 process create, old tapdisk2 process didn't close. 

I found something from xend source. when xend destroy tap2 device, xend create a thread to write remove to /sys/class/blktap2/blktap0/remove and then continue to create new tap2 device, but old tapdisk2 process didn't immediately close.

so I add some code before xend exec cmd ( [ TAPDISK_BINARY, '-n', '%s:%s' % (params, file) ] ). it just wait old tapdisk2 process. when it know the old process is closed, it will create new tapdisk2 process. 

after update /usr/lib64/python2.4/site-packages/xen/xend/server/BlktapController.py and restart xend, I install Windows 2008 R2 Standard Edition 64(disk size: 20G, C:\ 15G, D:\ 5G) on vhd file (as base image). the problem disappear. I tested 5 times, the problem didn't appear. I will do more test case later.

the attachment is the new code of BlktapController.py ( base on xen 4.0 ). you can copy it to /usr/lib64/python2.4/site-packages/xen/xend/server/ and  restart xend.

this is a tentative plan, I will track the real reason later. 

Cheers,

wyb

2010/5/8 yingbin wang <yingbin.wangyb@xxxxxxxxx>

Description of problem:

after install Windows 2008 R2 Standard Edition 64(disk size: 20G, C:\ 15G, D:\ 5G) on vhd file (as base image), os can not startup.

I found data error in C:\Windows\System32 :

?--------- ? ?    ?           ?            ? pnpts.dll

?--------- ? ?    ?           ?            ? pnpui.dll

?--------- ? ?    ?           ?            ? PnPUnattend.exe

?--------- ? ?    ?           ?            ? PnPutil.exe

 

How reproducible:

I tested 10 times, it appear 10 times that os can not startup.

 

Steps to Reproduce:

1. vhd-util create -n test.vhd -s 20480

2. xm create test.hvm

3. install Windows 2008 R2 Standard Edition 64 ( disk size: 20G, C:\ 15G, D:\ 5G )

4. can not startup

5. xm des test.vhd

6. tapdisk2 -n vhd:/mnt/img/test.vhd

7. mount -o offset=105906176 -t ntfs /dev/xen/blktap-2/tapdev0 /mnt/vhd

8. ll /mnt/vhd/Windows/System32 | grep ?

?--------- ? ?    ?           ?            ? pnpts.dll

?--------- ? ?    ?           ?            ? pnpui.dll

?--------- ? ?    ?           ?            ? PnPUnattend.exe

?--------- ? ?    ?           ?            ? PnPutil.exe

 

Additional info:

I install

Windows 2003 Standard Edition SP1 32(disk size: 50G, C:\50G) on vhd file, the problem disappear.

Redhat 5.4 AS 64(disk size:60G, /: 50G, swap: 10G) on vhd file, the problem disappear.

Windows 2008 R2 Standard Edition 64(disk size: 100G, C:\ 100G) on vhd file, the problem disappear.

Windows 2008 R2 Standard Edition 64(disk size: 100G, C:\ 90G, D:\10G) on vhd file, the problem disappear.

Windows 2008 R2 Standard Edition 64(disk size: 20G, C:\ 15G, D:\ 5G) on raw file, the problem disappear.

Windows 2008 R2 Standard Edition 64(disk size: 20G, C:\ 15G, D:\ 5G) on vhd file, the problem appear.

Windows 2008 R2 Standard Edition 64(disk size: 100G, C:\ 15G, D:\85G) on vhd file, the problem appear.

 

ps:

windows 2003 need 3G disk space.

redhat 5.4 need 4G disk space.

windows 2008 need 8G disk space.

the problem disappear means that os can startup and no data error.

 

compile env and filesystem :

 Redhat AS 5.4

 

xm info:

host                   : vm01

release                : 2.6.31.13

version                : #1 SMP Wed Apr 21 12:30:21 CST 2010

machine                : x86_64

nr_cpus                : 16

nr_nodes               : 1

cores_per_socket       : 4

threads_per_core       : 2

cpu_mhz                : 2400

hw_caps                : bfebfbff:28100800:00000000:00001b40:009ce3bd:00000000:00000001:00000000

virt_caps              : hvm

total_memory           : 24539

free_memory            : 1668

node_to_cpu            : node0:0-15

node_to_memory         : node0:1668

node_to_dma32_mem      : node0:82

max_node_id            : 0

xen_major              : 4

xen_minor              : 0

xen_extra              : .0

xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64

xen_scheduler          : credit

xen_pagesize           : 4096

platform_params        : virt_start=0xffff800000000000

xen_changeset          : unavailable

xen_commandline        : dom0_max_vcpus=2 dom0_vcpus_pin

cc_compiler            : gcc version 4.1.2 20080704 (Red Hat 4.1.2-46)

cc_compile_by          : root

cc_compile_domain      : dev.sd.test.com

cc_compile_date        : Mon Apr 26 10:17:37 CST 2010

xend_config_format     : 4

 

BlktapController.py
Description: Binary data

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