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Old 02-20-2012, 07:32 PM
Jan Köster
 
Default Problems with webDAV and rsync

I've rented some space at livedrive.com which I wanted to use as an
online backup. Livedrive offers access via webdav and (s)ftp. When I
mount the webdav share (using davfs2 or gvfs) and start rsyncing files
this always fails with error 5 (input/output error) or error 2 (no such
file). Same problem when mounting via sftp (sshfs/gvfs) but transfer is
even slower then.
Originally I wanted to use encfs to encrypt the files but didn't even
start testing it as the "normal" rsync fails.
As I'm not sure wether the problem is the webdav-mount or the remote
host it would be great to know if someone has similar problems with
webdav-mounts or if somebody has a solution to this problem.

Thanks a lot in advance

Jan

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Old 02-20-2012, 09:05 PM
Rick Stevens
 
Default Problems with webDAV and rsync

On 02/20/2012 12:32 PM, Jan Köster wrote:

I've rented some space at livedrive.com which I wanted to use as an
online backup. Livedrive offers access via webdav and (s)ftp. When I
mount the webdav share (using davfs2 or gvfs) and start rsyncing files
this always fails with error 5 (input/output error) or error 2 (no such
file). Same problem when mounting via sftp (sshfs/gvfs) but transfer is
even slower then.
Originally I wanted to use encfs to encrypt the files but didn't even
start testing it as the "normal" rsync fails.
As I'm not sure wether the problem is the webdav-mount or the remote
host it would be great to know if someone has similar problems with
webdav-mounts or if somebody has a solution to this problem.


There are a lot of webdav services that won't work with davfs2 as davfs
chunks the authentication bit and a lot of the davfs systems don't
deal with that well. OwnCloud (granted, a Windows app) doesn't like
it.
----------------------------------------------------------------------
- Rick Stevens, Systems Engineer, AllDigital ricks@alldigital.com -
- AIM/Skype: therps2 ICQ: 22643734 Yahoo: origrps2 -
- -
- "Microsoft is a cross between The Borg and the Ferengi. -
- Unfortunately they use Borg to do their marketing and Ferengi to -
- do their programming." -- Simon Slavin -
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Old 02-20-2012, 09:19 PM
Jan Köster
 
Default Problems with webDAV and rsync

> There are a lot of webdav services that won't work with davfs2 as davfs
> chunks the authentication bit and a lot of the davfs systems don't
> deal with that well. OwnCloud (granted, a Windows app) doesn't like
> it.

Maybe I should have said that copying (using cp) works quite well though
really slow. And this would not explain the similar problems when using
sshfs.

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Old 02-20-2012, 09:42 PM
Rick Stevens
 
Default Problems with webDAV and rsync

On 02/20/2012 02:19 PM, Jan Köster wrote:

There are a lot of webdav services that won't work with davfs2 as davfs
chunks the authentication bit and a lot of the davfs systems don't
deal with that well. OwnCloud (granted, a Windows app) doesn't like
it.


Maybe I should have said that copying (using cp) works quite well though
really slow. And this would not explain the similar problems when using
sshfs.


I'm just saying that dafvs2 does chunk the authentication and some
webdav stuff doesn't like it. I can use OwnCloud so long as I get it

set up via the web browser. A mount using davfs2 simply won't work and
you can see OwnCloud rejecting the chunked authentication pieces via a
tcpdump or wireshark snoop session.

I don't know if this would affect scp or sshfs. If they temporarily
mount the filesystem via davfs2 to do the move, this might affect it as
well. Just sharing what I've seen.
----------------------------------------------------------------------
- Rick Stevens, Systems Engineer, AllDigital ricks@alldigital.com -
- AIM/Skype: therps2 ICQ: 22643734 Yahoo: origrps2 -
- -
- "If you can't fix it...duct tape it!" -- Tim Allen -
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Old 02-20-2012, 10:01 PM
Jan Köster
 
Default Problems with webDAV and rsync

>
> I don't know if this would affect scp or sshfs. If they temporarily
> mount the filesystem via davfs2 to do the move, this might affect it as
> well. Just sharing what I've seen.

Thanks for that. Hopefully the hoster knows what they are doing and can
tell me if it depends on that.

Maybe I should just cross check using my old Mac but don't know at all
what kind of mounting mechanism Apple is using. If that's basing on
davfs2 too I still can't blame it on the hoster.
Any other ideas on testing this issue would be apreciated.

Thanks
Jan

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Old 02-20-2012, 10:34 PM
Rick Stevens
 
Default Problems with webDAV and rsync

On 02/20/2012 03:01 PM, Jan Köster wrote:




I don't know if this would affect scp or sshfs. If they temporarily
mount the filesystem via davfs2 to do the move, this might affect it as
well. Just sharing what I've seen.


Thanks for that. Hopefully the hoster knows what they are doing and can
tell me if it depends on that.

Maybe I should just cross check using my old Mac but don't know at all
what kind of mounting mechanism Apple is using. If that's basing on
davfs2 too I still can't blame it on the hoster.
Any other ideas on testing this issue would be apreciated.


I can say that the folk here that use Macs (OSX, not sure which flavor)
seem to be able to use OwnCloud with no problems apparently, so it must
not chunk the authentication.

I'm the only guy who's purely Linux-based. They try to get me to switch
and I do have a functional Hackintosh (running a legit copy of OSX I
bought from Apple so I'm only a hardware pirate), but since I'm a Linux
developer it'd be rather silly for me to go Mac. I develop with F16,
but ensure stuff runs on CentOS and such by testing using PVMs and HVMs.
----------------------------------------------------------------------
- Rick Stevens, Systems Engineer, AllDigital ricks@alldigital.com -
- AIM/Skype: therps2 ICQ: 22643734 Yahoo: origrps2 -
- -
- Microsoft Windows: Proof that P.T. Barnum was right -
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Old 02-20-2012, 11:12 PM
Jan Köster
 
Default Problems with webDAV and rsync

> I can say that the folk here that use Macs (OSX, not sure which flavor)
> seem to be able to use OwnCloud with no problems apparently, so it must
> not chunk the authentication.
>
I can confirm that after further testing. Just tested cp with larger
files (around 15 MB) in F16 (not working) and Mac OS X (Snow Leopard,
working). Rsync also works in OS X. So it seems that indeed davfs2 is
the problem. Does anybody know an alternative?

> I'm the only guy who's purely Linux-based. They try to get me to switch
> and I do have a functional Hackintosh (running a legit copy of OSX I
> bought from Apple so I'm only a hardware pirate), but since I'm a Linux
> developer it'd be rather silly for me to go Mac. I develop with F16,
> but ensure stuff runs on CentOS and such by testing using PVMs and HVMs.

Two years ago I would have said: Why not switching to Mac and using VMs
for development. But now as I see OS X more and more developing towards
a closed system (and getting more and more windows-like bugs) I've
decided to switch (back) to linux. If it wasn't all these little nasty
problems to deal with ...

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Old 03-08-2012, 09:06 AM
"Mirco Vitr"
 
Default Problems with webDAV and rsync

> I can confirm that after further testing. Just tested cp with larger
>files (around 15 MB) in F16 (not working) and Mac OS X (Snow Leopard,
>working). Rsync also works in OS X. So it seems that indeed davfs2 is
> the problem. Does anybody know an alternative?

Hi everybody,
unfortunately I have the same problem (I want to use davfs2 on my Synology Diskstation to automatically backup data to livedrive using local rsync to the mounted folder). Copying starts but soon I get input/output errors. :-(
So, does anybody know an alternative to davfs2 or a solution to the problem?
Thanks!
mvitr
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