Re: [Xen-users] How was CoW implemented on the Demo LiveCD (3.0) ??

[Anand <xen.mails@xxxxxxxxx>]

On 1/26/06, Tim Deegan <Tim.Deegan@xxxxxxxxxxxx> wrote:

What is the actual dmsetup command that fails?  What's the output of
"bash -x /usr/sbin/create_cow -i /root/xen/centos.4-2.img -n cent01 -s 50" ?

Here is the output. I used cent02 since cent01 was already present in /dev/mapper/

bash -x /usr/sbin/create_cow -i /root/xen/centos.4-2.img -n cent02 -s 50

+ set -e
+ BACKING_DIR=/tmp/cow_backing
+ mkdir -p /tmp/cow_backing
+ getopts qhi:n:b:s: opt
+ case $opt in
+ SOURCE=/root/xen/centos.4-
2.img
+ getopts qhi:n:b:s: opt
+ case $opt in
+ TARGET=cent02
+ getopts qhi:n:b:s: opt
+ case $opt in
+ BACKING_SIZE=50
+ getopts qhi:n:b:s: opt
+ '[' -z /root/xen/centos.4-2.img -o -z cent02 -o -z 50 ']'
+ check_prereq dmsetup
+ which dmsetup
+ check_prereq losetup
+ which losetup
+ check_prereq blockdev
+ which blockdev
+ dmsetup mknodes
+ '[' -e /dev/mapper/cent02 -o -e /tmp/cow_backing/cent02-storage ']'
+ '[' -b /root/xen/centos.4-2.img ']'
+ '[' -f /root/xen/centos.4-2.img ']'
++ find_free_loop_device
+++ ls -1 /dev/loop0 /dev/loop1 /dev/loop10 /dev/loop100 /dev/loop101 /dev/loop102 /dev/loop103 /dev/loop104 /dev/loop105 /dev/loop106 /dev/loop107 /dev/loop108 /dev/loop109 /dev/loop11 /dev/loop110 /dev/loop111 /dev/loop112 /dev/loop113 /dev/loop114 /dev/loop115 /dev/loop116 /dev/loop117 /dev/loop118 /dev/loop119 /dev/loop12 /dev/loop120 /dev/loop121 /dev/loop122 /dev/loop123 /dev/loop124 /dev/loop125 /dev/loop126 /dev/loop127 /dev/loop13 /dev/loop14 /dev/loop15 /dev/loop16 /dev/loop17 /dev/loop18 /dev/loop19 /dev/loop2 /dev/loop20 /dev/loop21 /dev/loop22 /dev/loop23 /dev/loop24 /dev/loop25 /dev/loop26 /dev/loop27 /dev/loop28 /dev/loop29 /dev/loop3 /dev/loop30 /dev/loop31 /dev/loop32 /dev/loop33 /dev/loop34 /dev/loop35 /dev/loop36 /dev/loop37 /dev/loop38 /dev/loop39 /dev/loop4 /dev/loop40 /dev/loop41 /dev/loop42 /dev/loop43 /dev/loop44 /dev/loop45 /dev/loop46 /dev/loop47 /dev/loop48 /dev/loop49 /dev/loop5 /dev/loop50 /dev/loop51 /dev/loop52 /dev/loop53 /dev/loop54 /dev/loop55 /dev/loop56 /dev/loop57 /dev/loop58 /dev/loop59 /dev/loop6 /dev/loop60 /dev/loop61 /dev/loop62 /dev/loop63 /dev/loop64 /dev/loop65 /dev/loop66 /dev/loop67 /dev/loop68 /dev/loop69 /dev/loop7 /dev/loop70 /dev/loop71 /dev/loop72 /dev/loop73 /dev/loop74 /dev/loop75 /dev/loop76 /dev/loop77 /dev/loop78 /dev/loop79 /dev/loop8 /dev/loop80 /dev/loop81 /dev/loop82 /dev/loop83 /dev/loop84 /dev/loop85 /dev/loop86 /dev/loop87 /dev/loop88 /dev/loop89 /dev/loop9 /dev/loop90 /dev/loop91 /dev/loop92 /dev/loop93 /dev/loop94 /dev/loop95 /dev/loop96 /dev/loop97 /dev/loop98 /dev/loop99
++ for device in '`ls -1 /dev/loop*`'
++ losetup /dev/loop0
++ for device in '`ls -1 /dev/loop*`'
++ losetup /dev/loop1
++ for device in '`ls -1 /dev/loop*`'
++ losetup /dev/loop10
++ for device in '`ls -1 /dev/loop*`'
++ losetup /dev/loop100
++ echo /dev/loop100
++ return
+ SOURCE_DEVICE=/dev/loop100
+ quiet echo 'Putting /root/xen/centos.4-2.img onto loopback device /dev/loop100'
+ '[' -n '' ']'
+ eval echo Putting /root/xen/centos.4-
2.img onto loopback device /dev/loop100
++ echo Putting /root/xen/centos.4-2.img onto loopback device /dev/loop100
Putting /root/xen/centos.4-2.img onto loopback device /dev/loop100
+ losetup /dev/loop100 /root/xen/centos.4-
2.img
+ echo /dev/loop100
++ blockdev --getsize /dev/loop100
+ SOURCE_SIZE=2050048
+ echo /dev/loop100
+ grep -q /dev/mapper/
+ quiet echo 'Creating a device mapper device for /dev/loop100'
+ '[' -n '' ']'
+ eval echo Creating a device mapper device for /dev/loop100
++ echo Creating a device mapper device for /dev/loop100
Creating a device mapper device for /dev/loop100
+ SOURCE_DM_DEVICE=cent02-master
+ echo '0 2050048 linear /dev/loop100 0'
+ dmsetup create cent02-master
+ echo cent02-master
+ '[' -z '' ']'
+ quiet echo 'Creating backing file'
+ '[' -n '' ']'
+ eval echo Creating backing file
++ echo Creating backing file
Creating backing file
+ BACKING_FILE=/tmp/cow_backing/cent02-storage
+ dd if=/dev/zero of=/tmp/cow_backing/cent02-storage bs=512 count=1 seek=102400
1+0 records in
1+0 records out
++ find_free_loop_device
+++ ls -1 /dev/loop0 /dev/loop1 /dev/loop10 /dev/loop100 /dev/loop101 /dev/loop102 /dev/loop103 /dev/loop104 /dev/loop105 /dev/loop106 /dev/loop107 /dev/loop108 /dev/loop109 /dev/loop11 /dev/loop110 /dev/loop111 /dev/loop112 /dev/loop113 /dev/loop114 /dev/loop115 /dev/loop116 /dev/loop117 /dev/loop118 /dev/loop119 /dev/loop12 /dev/loop120 /dev/loop121 /dev/loop122 /dev/loop123 /dev/loop124 /dev/loop125 /dev/loop126 /dev/loop127 /dev/loop13 /dev/loop14 /dev/loop15 /dev/loop16 /dev/loop17 /dev/loop18 /dev/loop19 /dev/loop2 /dev/loop20 /dev/loop21 /dev/loop22 /dev/loop23 /dev/loop24 /dev/loop25 /dev/loop26 /dev/loop27 /dev/loop28 /dev/loop29 /dev/loop3 /dev/loop30 /dev/loop31 /dev/loop32 /dev/loop33 /dev/loop34 /dev/loop35 /dev/loop36 /dev/loop37 /dev/loop38 /dev/loop39 /dev/loop4 /dev/loop40 /dev/loop41 /dev/loop42 /dev/loop43 /dev/loop44 /dev/loop45 /dev/loop46 /dev/loop47 /dev/loop48 /dev/loop49 /dev/loop5 /dev/loop50 /dev/loop51 /dev/loop52 /dev/loop53 /dev/loop54 /dev/loop55 /dev/loop56 /dev/loop57 /dev/loop58 /dev/loop59 /dev/loop6 /dev/loop60 /dev/loop61 /dev/loop62 /dev/loop63 /dev/loop64 /dev/loop65 /dev/loop66 /dev/loop67 /dev/loop68 /dev/loop69 /dev/loop7 /dev/loop70 /dev/loop71 /dev/loop72 /dev/loop73 /dev/loop74 /dev/loop75 /dev/loop76 /dev/loop77 /dev/loop78 /dev/loop79 /dev/loop8 /dev/loop80 /dev/loop81 /dev/loop82 /dev/loop83 /dev/loop84 /dev/loop85 /dev/loop86 /dev/loop87 /dev/loop88 /dev/loop89 /dev/loop9 /dev/loop90 /dev/loop91 /dev/loop92 /dev/loop93 /dev/loop94 /dev/loop95 /dev/loop96 /dev/loop97 /dev/loop98 /dev/loop99
++ for device in '`ls -1 /dev/loop*`'
++ losetup /dev/loop0
++ for device in '`ls -1 /dev/loop*`'
++ losetup /dev/loop1
++ for device in '`ls -1 /dev/loop*`'
++ losetup /dev/loop10
++ for device in '`ls -1 /dev/loop*`'
++ losetup /dev/loop100
++ for device in '`ls -1 /dev/loop*`'
++ losetup /dev/loop101
++ echo /dev/loop101
++ return
+ BACKING_DEVICE=/dev/loop101
+ losetup /dev/loop101 /tmp/cow_backing/cent02-storage
+ echo /dev/loop101
+ quiet echo 'Creating snapshot'
+ '[' -n '' ']'
+ eval echo Creating snapshot
++ echo Creating snapshot
Creating snapshot
+ '[' -n ']'
+ dmsetup suspend cent02-master
+ echo '0 2050048 snapshot /dev/mapper/cent02-master /dev/loop101 p 50'
+ dmsetup create cent02
device-mapper ioctl cmd 9 failed: Invalid argument
Command failed


Looks like it fails at the dmsetup create line.

-- 

regards,

Anand
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