Newbie question: Error creating domain

Newbie question: Error creating domain

[Fredrik Dahlberg]

When trying to create a new domain I get the following error:

root@chekov:~# xm create vmid=1
Using config file /etc/xen/xmdefaults
Error: Error creating domain: [Failure instance:
Traceback:xen.xend.XendDomainInfo.VmError, vbd: Segments not
foundXXXXXX:uname=phy:hda3

If I do a dry-run:
root@chekov:~# xm create -n vmid=1
Using config file xmdefaults
(vm
    (name 'This is VM 1')
    (memory '64')
    (cpu '1')
    (image
        (linux
            (kernel /boot/vmlinuz-2.4.26-xenU)
            (ip :1.2.3.4::::eth0:dhcp)
            (root '/dev/sda1 ro')
        )
    )
    (device (vbd (uname phy:hda3) (dev sda1) (mode w)))
    (device (vbd (uname phy:hda4) (dev sda2) (mode w)))
    (device (vif (mac aa:0:0:2e:29:6c)))
)


I have created a Slackware filesystem pretty much the same way I used to do
under UML, the most important steps are shown below:

# I have created 2 partitions for my guest os, hda3 and hda4
root@chekov:~# fdisk -l /dev/hda
Disk /dev/hda: 8455 MB, 8455200768 bytes
255 heads, 63 sectors/track, 1027 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hda1   *           1         697     5598621   83  Linux
/dev/hda2             698         742      361462+  82  Linux swap
/dev/hda3             743         865      987997+  83  Linux
/dev/hda4             866         882      136552+  82  Linux swap

# I created filesystems on both of them:
root@chekov:~# mkfs -t ext3 /dev/hda3
root@chekov:~# mkswap /dev/hda4

# I mounted my new guest root filesystem:
root@chekov:~# mount /dev/hda3 /build/root

# I edited all the tagfiles so they only had ADD or SKP selections and
installed my choice of packages:
root@chekov:/build/slackware# /sbin/installpkg -root /build/root a/*.tgz
ap/*.tgz d/*.tgz l/*.tgz n/*.tgz

# I created a new fstab:
/dev/sda1        /                ext3        defaults         1   1
/dev/sda2        swap             swap        defaults         0   0
devpts           /dev/pts         devpts      gid=5,mode=620   0   0
proc             /proc            proc        defaults         0   0

# And finally, I unmounted /dev/hda3 before trying to create the new domain

Any help is appreciated,
Fredrik Dahlberg




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Re: Newbie question: Error creating domain

[Ian Pratt]

> When trying to create a new domain I get the following error:
> 
> root@chekov:~# xm create vmid=1
> Using config file /etc/xen/xmdefaults
> Error: Error creating domain: [Failure instance:
> Traceback:xen.xend.XendDomainInfo.VmError, vbd: Segments not
> foundXXXXXX:uname=phy:hda3

What you've configured should work just fine. Please can you try
upgrading to the latest repo as I changed some of this code
yesterday (though I don't believe there was ever a bug that would
cause this).

A couple of other things to try:
 * try configuring just one vbd i.e. no swap on hda4
 * what's the output of 'sfdisk -s /dev/hda3'
 * instead of hda3 use 0x0303

Thanks for the clear failure report; I'm sure we can get to the
bottom of this one.

Thanks,
Ian


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Re: Newbie question: Error creating domain

[Fredrik Dahlberg]

Ian Pratt wrote:

> What you've configured should work just fine. Please can you try
> upgrading to the latest repo as I changed some of this code
> yesterday (though I don't believe there was ever a bug that would
> cause this).
> 
> A couple of other things to try:
>  * try configuring just one vbd i.e. no swap on hda4
>  * what's the output of 'sfdisk -s /dev/hda3'
>  * instead of hda3 use 0x0303
> 
> Thanks for the clear failure report; I'm sure we can get to the
> bottom of this one.
> 
> Thanks,
> Ian
> 

# I upgraded to the latest xeno-unstable via BitKeeper wich didn't solve 
the problem.

# Configuring just one vbd didn't help

# Changing physdev:hda3 to physdev:0x0303 solved the problem, any idea why?

# Output from sfdisk -s /dev/hda3
987997

I don't know if this is related, but I have had some problems with 
Linux/Slackware not detecting the correct BIOS geometry for my old disk. 
I had to add hda=16383,16,63 as a kernel parameter in my grub 
configuration. I tried adding the same parameter to my Xen boot entry, 
but without any success.

# cat /boot/grub/menu.lst
default 0
timeout 10
title=Xen 1.3
root (hd0,0)
kernel /boot/xen.gz dom0_mem=131072 com1=115200,8n1
module /boot/vmlinuz-2.4.26-xen0 root=/dev/hda1 ro hda=16383,16,63
title=Slackware 10.0
root (hd0,0)
kernel /boot/vmlinuz root=/dev/hda1 ro hda=16383,16,63

Thanks,
Fredrik



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Re: Newbie question: Error creating domain

[Ian Pratt]

> # I upgraded to the latest xeno-unstable via BitKeeper wich didn't solve 
> the problem.

> # Output from sfdisk -s /dev/hda3
> 987997
> 
> I don't know if this is related, but I have had some problems with 
> Linux/Slackware not detecting the correct BIOS geometry for my old disk. 
> I had to add hda=16383,16,63 as a kernel parameter in my grub 
> configuration. I tried adding the same parameter to my Xen boot entry, 
> but without any success.

My suspicion is that "sfdisk -s /dev/hda3" is returning a bogus
size for the partition.  Please can you post the output of
/proc/partitions, and "dumpe2fs /dev/hda3".

Thanks,
Ian


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Re: Newbie question: Error creating domain

[Fredrik Dahlberg]

Ian Pratt wrote:
> My suspicion is that "sfdisk -s /dev/hda3" is returning a bogus
> size for the partition.  Please can you post the output of
> /proc/partitions, and "dumpe2fs /dev/hda3".
> 
> Thanks,
> Ian

# cat /proc/partitions
major	minor	#blocks	name
3	0	8257032	hda
3	1	5598621	hda1
3	2	361462	hda2
3	3	987997	hda3
3	4	136552	hda4

# dumpe2fs /dev/hda3
Filesystem volume name:   <none>
Last mounted on:          <not available>
Filesystem UUID:          e847d3ae-4e5f-4074-bdd4-94ef95273ba2
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal filetype sparse_super
Default mount options:    (none)
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              123648
Block count:              246999
Reserved block count:     12349
Free blocks:              2386
Free inodes:              57950
First block:              0
Block size:               4096
Fragment size:            4096
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         15456
Inode blocks per group:   483
Filesystem created:       Sun Jul 18 12:34:28 2004
Last mount time:          Mon Jul 19 01:10:10 2004
Last write time:          Mon Jul 19 01:17:46 2004
Mount count:              5
Maximum mount count:      38
Last checked:             Sun Jul 18 12:34:28 2004
Check interval:           15552000 (6 months)
Next check after:         Fri Jan 14 11:34:28 2005
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:		  128
Journal inode:            8
Default directory hash:   tea
Directory Hash Seed:      f7574f14-fcf4-43ad-9052-ea7e31051819
Journal backup:           inode blocks


Group 0: (Blocks 0-32767)
   Primary superblock at 0, Group descriptors at 1-1
   Block bitmap at 2 (+2), Inode bitmap at 3 (+3)
   Inode table at 4-486 (+4)
   0 free blocks, 7241 free inodes, 570 directories
   Free blocks:
   Free inodes: 8216-15456
Group 1: (Blocks 32768-65535)
   Backup superblock at 32768, Group descriptors at 32769-32769
   Block bitmap at 32770 (+2), Inode bitmap at 32771 (+3)
   Inode table at 32772-33254 (+4)
   0 free blocks, 7240 free inodes, 479 directories
   Free blocks:
   Free inodes: 23673-30912
Group 2: (Blocks 65536-98303)
   Block bitmap at 65536 (+0), Inode bitmap at 65537 (+1)
   Inode table at 65538-66020 (+2)
   1 free blocks, 7215 free inodes, 566 directories
   Free blocks: 94718
   Free inodes: 39135, 39155-46368
Group 3: (Blocks 98304-131071)
   Backup superblock at 98304, Group descriptors at 98305-98305
   Block bitmap at 98306 (+2), Inode bitmap at 98307 (+3)
   Inode table at 98308-98790 (+4)
   2 free blocks, 6593 free inodes, 235 directories
   Free blocks: 101185-101186
   Free inodes: 55232-61824
Group 4: (Blocks 131072-163839)
   Block bitmap at 131072 (+0), Inode bitmap at 131073 (+1)
   Inode table at 131074-131556 (+2)
   2383 free blocks, 7243 free inodes, 285 directories
   Free blocks: 161216-161218, 161401-161403, 161405-161408, 161410, 
161436-161441, 161443, 161445, 161457-161463, 161465, 161467, 
161470-161471, 161480, 161484, 161489-163839
   Free inodes: 70038-77280
Group 5: (Blocks 163840-196607)
   Backup superblock at 163840, Group descriptors at 163841-163841
   Block bitmap at 163842 (+2), Inode bitmap at 163843 (+3)
   Inode table at 163844-164326 (+4)
   0 free blocks, 7325 free inodes, 568 directories
   Free blocks:
   Free inodes: 77564, 85403-85404, 85413, 85416-92736
Group 6: (Blocks 196608-229375)
   Block bitmap at 196608 (+0), Inode bitmap at 196609 (+1)
   Inode table at 196610-197092 (+2)
   0 free blocks, 7317 free inodes, 225 directories
   Free blocks:
   Free inodes: 100876-108192
Group 7: (Blocks 229376-246998)
   Backup superblock at 229376, Group descriptors at 229377-229377
   Block bitmap at 229378 (+2), Inode bitmap at 229379 (+3)
   Inode table at 229380-229862 (+4)
   0 free blocks, 7776 free inodes, 688 directories
   Free blocks:
   Free inodes: 115873-123648


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Re: Newbie question: Error creating domain

[Ian Pratt]

> Ian Pratt wrote:
> > My suspicion is that "sfdisk -s /dev/hda3" is returning a bogus
> > size for the partition.  Please can you post the output of
> > /proc/partitions, and "dumpe2fs /dev/hda3".

> # cat /proc/partitions
> major	minor	#blocks	name
> 3	3	987997	hda3
> 
> # dumpe2fs /dev/hda3
> Block count:              246999
> Block size:               4096

I still don't quite understand why it's failing, but I think I
know enough to fix it: It's a 1kb block vs 512 byte sector
rounding issue.

I've checked in what I believe will be a fix.

Thanks,
Ian


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Re: Newbie question: Error creating domain

[Fredrik Dahlberg]

Ian Pratt wrote:
  > I still don't quite understand why it's failing, but I think I
> know enough to fix it: It's a 1kb block vs 512 byte sector
> rounding issue.
> 
> I've checked in what I believe will be a fix.
> 
> Thanks,
> Ian

I'm sorry to say that it didn't help. I just did:
# bk clone bk://xen.bkbits.net/xeno-unstable.bk
# make world && make install

When I try to create a new domain a get a slightly different error than 
last time:
# xm create vmid=1
Using config file /etc/xen/xmdefaults

config: (vm (name 'This is VM 1') (memory '64') (cpu '1') (image (linux 
(kernel /boot/vmlinuz-2.4.26-xenU) (ip :1.2.3.4::::eth0:dhcp) (root 
'/dev/sda1 ro'))) (device (vbd (uname phy:hda3) (dev sda1) (mode w))) 
(device (vif (mac aa:00:00:2d:9e:09))))
VIRTUAL MEMORY ARRANGEMENT:
  Loaded kernel: c0100000->c02cd2a8
  Init. ramdisk: c02ce000->c02ce000
  Phys-Mach map: c02ce000->c02de000
  Page tables:   c02de000->c02e0000
  Start info:    c02e0000->c02e1000
  Boot stack:    c02e1000->c02e2000
  TOTAL:         c0000000->c0400000
  ENTRY ADDRESS: c0100000
EVENT> xend.console.create [11, 1, 9601]
respond_be_create>
 >BlkifController>send_be_disconnect> dom= 1
op_create> Deferred Exception creating domain: [Failure instance: 
Traceback: xen.xend.XendError.VmError, vbd: Segments not found: 
uname=phy:hda3
/usr/lib/python2.3/site-packages/twisted/internet/defer.py:338:_runCallbacks
/usr/lib/python2.3/site-packages/xen/xend/XendDomainInfo.py:306:_vm_configure1
/usr/lib/python2.3/site-packages/xen/xend/XendDomainInfo.py:665:create_devices
/usr/lib/python2.3/site-packages/xen/xend/XendDomainInfo.py:893:vm_dev_vbd
/usr/lib/python2.3/site-packages/xen/xend/XendDomainInfo.py:140:make_disk
]
 >BlkifController>send_be_destroy> dom= 1
Error: Error creating domain: [Failure instance: Traceback: 
xen.xend.XendError.VmError, vbd: Segments not found: uname=phy:hda3

/Fredrik


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Re: Newbie question: Error creating domain

[Ian Pratt]

> Ian Pratt wrote:
>   > I still don't quite understand why it's failing, but I think I
> > know enough to fix it: It's a 1kb block vs 512 byte sector
> > rounding issue.
> 
> I'm sorry to say that it didn't help. I just did:
> # bk clone bk://xen.bkbits.net/xeno-unstable.bk
> # make world && make install

OK, it's not something dumb like sfdisk just isn't in /sbin/ on
your system? Does using the 0x0303 syntax still work?

Ian



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Re: Newbie question: Error creating domain

[Fredrik Dahlberg]

Ian Pratt wrote:

> OK, it's not something dumb like sfdisk just isn't in /sbin/ on
> your system? Does using the 0x0303 syntax still work?
> 
> Ian
> 

It looks like you nailed it, sfdisk is located in /usr/sbin in Slackware 
10.0. :)

0x0303 is still working.

/Fredrik


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