Re: [Xen-users] tap2:remus:backup_ip:9000|aio:/path_to_disk.img not working - OSError: [Errno 2] No such file or directory

[Manuel Silva <manuel79silva@xxxxxxxxx>]

Dear Todd,

I have Xen and this features working:
 - xm migrate --live myvm mybckphost 
 - remus -i 200 myvm mybckphost

However, I just simply cannot put remus working in order to synchronize 
disks. It's impossible to specify  
"tap2:remus:backup_ip:port|aio:path_to_file".

It keeps giving me the error "mounted = devtype in ['tap', 'tap2'] and taptype != 'aio' and taptype != 'sync' and not os.stat(fn).st_rdev
 OSError: [Errno 2] No such file or directory: 'backup_ip:9000|aio:/home/xen/domains/lucid/disk.img"

What do you mean with "backup_ip:9000|aio:/home/xen/domains/lucid/disk.img is not addressable"?
Image file /home/xen/domains/lucid/disk.img does exists and works when specifying "tap2:aio:/home/xen/domains/lucid/disk.img" (in this case without Remus).

Note: I'm using Paravirtualized, not HVM.

Really, after googling weeks, I don't know what else do...


Kind regards,
Manuel

2010/12/22 Todd Deshane <todd.deshane@xxxxxxx>

On Mon, Dec 20, 2010 at 8:01 PM, Manuel Silva <manuel79silva@xxxxxxxxx> wrote:
> Hello,
>
> I'm using Xen (installed from source - "hg clone
> http://xenbits.xen.org/xen-4.0-testing.hg") on Debian Lenny. Dom0 kernel is
> 2.6.32-bpo.5-xen-686.
>
> Until now I have successfully ran the Lucid Ubuntu as domU guest, defining
> disks as (and also as file:):
> disk = ['tap2:aio:/home/xen/domains/lucid/disk.img,xvda1,w',
> 'tap2:aio:/home/xen/domains/lucid/swap.img,xvda2,w']
>
> However, when I try "disk =
> ['tap2:remus:backup_ip:9000|aio:/home/xen/domains/lucid/disk.img,xvda1,w',
> 'tap2:remus:backup_ip:9000|aio:/home/xen/domains/lucid/swap.img,xvda2,w']" I
> have no luck.
>
> Please, can you tell me what's wrong? I have spend so many time googling,
> but no one seems to address this issue.
>
> Can someone tell me if this happens when installing xen hypervisor directly
> from deb packages (version 4.0 for Debian squeeze)?
>
> I'll appreciate your help (I'm really stuck).
> Thanks in advance.
>
> Best regards,
> Manuel Silva
>
>
> PS.: The error follows:
>
> [2010-12-21 00:32:23 2091] DEBUG (XendDomainInfo:101)
> XendDomainInfo.create(['vm', ['name', 'lucid'], ['memory', 128],
> ['on_xend_start', 'ignore'], ['on_xend_stop', 'ignore'], ['vcpus', 1],
> ['oos', 1], ['bootloader', '/usr/bin/pygrub'], ['bootloader_args', ''],
> ['image', ['linux', ['root', '/dev/xvda1 ro'], ['videoram', 4], ['args',
> 'xencons=tty'], ['tsc_mode', 0], ['nomigrate', 0]]], ['s3_integrity', 1],
> ['device', ['tap2', ['uname',
> 'tap2:remus:backup_ip:9000|aio:/home/xen/domains/lucid/disk.img'], ['dev',
> 'xvda1'], ['mode', 'w']]], ['device', ['tap2', ['uname',
> 'tap2:remus:backup_ip:9000|aio:/home/xen/domains/lucid/swap.img'], ['dev',
> 'xvda2'], ['mode', 'w']]], ['device', ['vif']]])
> [2010-12-21 00:32:23 2091] DEBUG (XendDomainInfo:2508)
> XendDomainInfo.constructDomain
> [2010-12-21 00:32:23 2091] DEBUG (balloon:220) Balloon: 132032 KiB free;
> need 16384; done.
> [2010-12-21 00:32:23 2091] DEBUG (XendDomain:464) Adding Domain: 5
> [2010-12-21 00:32:23 2091] DEBUG (XendDomainInfo:2818)
> XendDomainInfo.initDomain: 5 256
> [2010-12-21 00:32:23 2091] ERROR (XendDomainInfo:483) VM start failed
> Traceback (most recent call last):
>   File "usr/lib/python2.5/site-packages/xen/xend/XendDomainInfo.py", line
> 469, in start
>     XendTask.log_progress(31, 60, self._initDomain)
>   File "usr/lib/python2.5/site-packages/xen/xend/XendTask.py", line 209, in
> log_progress
>     retval = func(*args, **kwds)
>   File "usr/lib/python2.5/site-packages/xen/xend/XendDomainInfo.py", line
> 2820, in _initDomain
>     self._configureBootloader()
>   File "usr/lib/python2.5/site-packages/xen/xend/XendDomainInfo.py", line
> 3245, in _configureBootloader
>     mounted = devtype in ['tap', 'tap2'] and taptype != 'aio' and taptype !=
> 'sync' and not os.stat(fn).st_rdev
> OSError: [Errno 2] No such file or directory:
> 'backup_ip:9000|aio:/home/xen/domains/lucid/disk.img'
> [2010-12-21 00:32:23 2091] DEBUG (XendDomainInfo:3053)
> XendDomainInfo.destroy: domid=5
> [2010-12-21 00:32:23 2091] DEBUG (XendDomainInfo:2416) No device model
> [2010-12-21 00:32:23 2091] DEBUG (XendDomainInfo:2418) Releasing devices
> [2010-12-21 00:32:23 2091] ERROR (XendDomainInfo:106) Domain construction
> failed
> Traceback (most recent call last):
>   File "usr/lib/python2.5/site-packages/xen/xend/XendDomainInfo.py", line
> 104, in create
>     vm.start()
>   File "usr/lib/python2.5/site-packages/xen/xend/XendDomainInfo.py", line
> 469, in start
>     XendTask.log_progress(31, 60, self._initDomain)
>   File "usr/lib/python2.5/site-packages/xen/xend/XendTask.py", line 209, in
> log_progress
>     retval = func(*args, **kwds)
>   File "usr/lib/python2.5/site-packages/xen/xend/XendDomainInfo.py", line
> 2820, in _initDomain
>     self._configureBootloader()
>   File "usr/lib/python2.5/site-packages/xen/xend/XendDomainInfo.py", line
> 3245, in _configureBootloader
>     mounted = devtype in ['tap', 'tap2'] and taptype != 'aio' and taptype !=
> 'sync' and not os.stat(fn).st_rdev
> OSError: [Errno 2] No such file or directory:
> 'backup_ip:9000|aio:/home/xen/domains/lucid/disk.img'
> [2010-12-21 00:32:23 2091] ERROR (xmlrpclib2:178) Internal error handling
> xend.domain.create
> Traceback (most recent call last):
>   File "usr/lib/python2.5/site-packages/xen/util/xmlrpclib2.py", line 131,
> in _marshaled_dispatch
>     response = self._dispatch(method, params)
>   File "/usr/lib/python2.5/SimpleXMLRPCServer.py", line 415, in _dispatch
>     return func(*params)
>   File "usr/lib/python2.5/site-packages/xen/xend/server/XMLRPCServer.py",
> line 79, in domain_create
>     info = XendDomain.instance().domain_create(config)
>   File "usr/lib/python2.5/site-packages/xen/xend/XendDomain.py", line 982,
> in domain_create
>     dominfo = XendDomainInfo.create(config)
>   File "usr/lib/python2.5/site-packages/xen/xend/XendDomainInfo.py", line
> 104, in create
>     vm.start()
>   File "usr/lib/python2.5/site-packages/xen/xend/XendDomainInfo.py", line
> 469, in start
>     XendTask.log_progress(31, 60, self._initDomain)
>   File "usr/lib/python2.5/site-packages/xen/xend/XendTask.py", line 209, in
> log_progress
>     retval = func(*args, **kwds)
>   File "usr/lib/python2.5/site-packages/xen/xend/XendDomainInfo.py", line
> 2820, in _initDomain
>     self._configureBootloader()
>   File "usr/lib/python2.5/site-packages/xen/xend/XendDomainInfo.py", line
> 3245, in _configureBootloader
>     mounted = devtype in ['tap', 'tap2'] and taptype != 'aio' and taptype !=
> 'sync' and not os.stat(fn).st_rdev
> OSError: [Errno 2] No such file or directory:
> 'backup_ip:9000|aio:/home/xen/domains/lucid/disk.img

The problem looks to be related to the fact that
backup_ip:9000|aio:/home/xen/domains/lucid/disk.img is not addressable
(see the tail of your error message).

Can you confirm that you have the remus part working correctly?

Hope that helps.

Thanks,
Todd

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