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Posted to users@subversion.apache.org by Rodrigo Cesar Gevaerd de Faria <rc...@lumis.com.br> on 2006/08/02 14:57:16 UTC
using hotcopy through a network drive
Hi,
I would like to know if I can run the svnadmin hotcopy command to copy a
repository on Berkeley DB through a network drive without problems, or if
this command also suffers the limitations of accessing the Berkeley DB
through a network drive and should be executed on local drive only.
Thanks,
Rodrigo.
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Re: using hotcopy through a network drive
Posted by Blair Zajac <bl...@orcaware.com>.
eg wrote:
> Gavin Lambert wrote:
>>
>> I have no solid evidence one way or the other, but I'd be very
>> suspicious of it myself.
>>
>> My understanding is that file locks are unreliable across a network (I
>> forget whether it's the Windows networking or the Linux networking
>> protocols that are particularly bad in this regard). Without reliable
>> file locks, I can't think of a way that hotcopy could safely replicate
>> the repository. I'm not saying it can't work, I'm just saying that I'd
>> be surprised if it did. But I've been surprised before :)
>
> This link (a bit) old, seems to confirm both of your suspicions for BDB:
>
> http://svn.haxx.se/users/archive-2004-05/0434.shtml
You'll be fine to copy the BDB repository to a network drive. You'll see that
the problem noted is that they ran 'svnadmin recover' on the copy made on the
network drive.
If you need to restore from the copy on the network drive, you copy it back to
your local drive and do 'svnadmin recover' on it there.
Finally, if you run 'svnadmin hotcopy' on the box that has the repository on its
local disk, you'll be fine.
Regards,
Blair
--
Blair Zajac, Ph.D.
<bl...@orcaware.com>
http://www.orcaware.com/svn/
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Re: using hotcopy through a network drive
Posted by eg <eg...@gmail.com>.
Gavin Lambert wrote:
>
> I have no solid evidence one way or the other, but I'd be very
> suspicious of it myself.
>
> My understanding is that file locks are unreliable across a network (I
> forget whether it's the Windows networking or the Linux networking
> protocols that are particularly bad in this regard). Without reliable
> file locks, I can't think of a way that hotcopy could safely replicate
> the repository. I'm not saying it can't work, I'm just saying that I'd
> be surprised if it did. But I've been surprised before :)
This link (a bit) old, seems to confirm both of your suspicions for BDB:
http://svn.haxx.se/users/archive-2004-05/0434.shtml
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RE: using hotcopy through a network drive
Posted by Gavin Lambert <ga...@compacsort.com>.
Quoth Rodrigo Cesar Gevaerd de Faria <ma...@lumis.com.br>:
> My concern is that the svn documentation states clearly that
> a user cannot access the BDB repository by a 'file://' url in
> a network share, because would risk of database corruption.
> But I could not find anything regarding this about the
> svnadmin hotcopy command. So I don't know if this 'file://'
> limitation would also apply to the hotcopy command or not.
I have no solid evidence one way or the other, but I'd be very
suspicious of it myself.
My understanding is that file locks are unreliable across a network (I
forget whether it's the Windows networking or the Linux networking
protocols that are particularly bad in this regard). Without reliable
file locks, I can't think of a way that hotcopy could safely replicate
the repository. I'm not saying it can't work, I'm just saying that I'd
be surprised if it did. But I've been surprised before :)
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RE: using hotcopy through a network drive
Posted by Rodrigo Cesar Gevaerd de Faria <rc...@lumis.com.br>.
> > Actually I wish to hotcopy "from" a network drive with the subversion
> > repository, as a way to backup it. Assuming that there are users
> > concurrently using the repository, my question is if I could run this
> > command from another computer through a network share, or if it could be
> run
> > only locally on the computer that servers the repository.
> >
> > I don't know much about the BDB, but what I read about it in the svn
> > book, I think that if this command does not create any db lock, just
> copies
> > the files in a specific order, maybe there would be no problem. Or maybe
> > there is... because of the file locking being different in the network
> > share?
> >
>
> I still don't think there will be any problems... the only possible
> contention is in your repository, but hotcopy knows how to handle this.
> The output is just writing data as far as I know.
My concern is that the svn documentation states clearly that a user cannot
access the BDB repository by a 'file://' url in a network share, because
would risk of database corruption. But I could not find anything regarding
this about the svnadmin hotcopy command. So I don't know if this 'file://'
limitation would also apply to the hotcopy command or not.
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Re: using hotcopy through a network drive
Posted by eg <eg...@gmail.com>.
Rodrigo Cesar Gevaerd de Faria wrote:
> Actually I wish to hotcopy "from" a network drive with the subversion
> repository, as a way to backup it. Assuming that there are users
> concurrently using the repository, my question is if I could run this
> command from another computer through a network share, or if it could be run
> only locally on the computer that servers the repository.
>
> I don't know much about the BDB, but what I read about it in the svn
> book, I think that if this command does not create any db lock, just copies
> the files in a specific order, maybe there would be no problem. Or maybe
> there is... because of the file locking being different in the network
> share?
>
I still don't think there will be any problems... the only possible
contention is in your repository, but hotcopy knows how to handle this.
The output is just writing data as far as I know.
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RE: using hotcopy through a network drive
Posted by Rodrigo Cesar Gevaerd de Faria <rc...@lumis.com.br>.
> -----Mensagem original-----
> De: news [mailto:news@sea.gmane.org] Em nome de eg
> Enviada em: quarta-feira, 2 de agosto de 2006 14:25
> Para: users@subversion.tigris.org
> Assunto: Re: using hotcopy through a network drive
>
> Rodrigo Cesar Gevaerd de Faria wrote:
> > Hi,
> >
> > I would like to know if I can run the svnadmin hotcopy command to copy a
> > repository on Berkeley DB through a network drive without problems, or
> if
> > this command also suffers the limitations of accessing the Berkeley DB
> > through a network drive and should be executed on local drive only.
> >
>
> First, I will assume you mean you wish to hotcopy "to" a network drive
> from a Subversion repository (which is using BDB filesystem).
>
> As far as I understand, the BDB network drive limitations are related to
> locking (and hence multi-user access).
>
> In your case, there will only be one process (hotcopy) writing to the
> network drive location, so it shouldnt be an issue.
>
Actually I wish to hotcopy "from" a network drive with the subversion
repository, as a way to backup it. Assuming that there are users
concurrently using the repository, my question is if I could run this
command from another computer through a network share, or if it could be run
only locally on the computer that servers the repository.
I don't know much about the BDB, but what I read about it in the svn
book, I think that if this command does not create any db lock, just copies
the files in a specific order, maybe there would be no problem. Or maybe
there is... because of the file locking being different in the network
share?
Thanks,
Rodrigo.
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Re: using hotcopy through a network drive
Posted by eg <eg...@gmail.com>.
Rodrigo Cesar Gevaerd de Faria wrote:
> Hi,
>
> I would like to know if I can run the svnadmin hotcopy command to copy a
> repository on Berkeley DB through a network drive without problems, or if
> this command also suffers the limitations of accessing the Berkeley DB
> through a network drive and should be executed on local drive only.
>
First, I will assume you mean you wish to hotcopy "to" a network drive
from a Subversion repository (which is using BDB filesystem).
As far as I understand, the BDB network drive limitations are related to
locking (and hence multi-user access).
In your case, there will only be one process (hotcopy) writing to the
network drive location, so it shouldnt be an issue.
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