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Re: High Availability Recommendation

From: Johnathan Gifford <jgifford_at_wernervas.com>
Date: 2007-01-31 20:44:01 CET

>>> On Tue, Jan 30, 2007 at 1:07 PM, in message
<45BF434A.158F.00BE.0@wernervas.com>, "Johnathan Gifford"
<jgifford@wernervas.com> wrote:
>>>> On Tue, Jan 30, 2007 at 11:49 AM, in message
> <94a776e70701300949j3598e7d8tca3ab6467c3511bf@mail.gmail.com>, "Justin
> Johnson"
> <justinjohnson@gmail.com> wrote:
>> On 1/29/07, Justin Johnson <justinjohnson@gmail.com> wrote:
>>> > > I am using FSFS. I was planning on having the filesystem mounted on
>>> > > two systems at the same time, but only so we can quickly fail over if
>>> > > one goes down. Won't the repository be corrupted if two servers are
>>> > > actively writing to the same repository at the same time? If not, I
>>> > > am confused as to how.
>>> > >
>>> >
>>> > It's been explained to me that the with FSFS format, the file locking with
>> the Subversion binaries the transaction files in the FSFS directories keep
>> things in check. But this means putting a set of Subversion binaries on
> each
>> server and not the NFS mount. However, the binaries don't require much
>> configuration. As you said, hooks scripts and other stuff involving the
>> repositories themselves is where all the configuration occurs.
>>> Wow, that would be great! Can someone else confirm this for me and
>>> explain how it works or point me to something I can read about it?
>>> Why would this work only if the binaries aren't on the NFS mount? I
>>> can see the need for different configuration files in Apache due to
>>> different host names for the servers. Is there some other reason the
>>> binaries would need to be off of the NFS mount?
>> In addition to needing confirmation about whether multiple servers can
>> write to a repository on the same disk NFS mounted on all of the
>> servers, I am also concerned about NFS in general. The notes at
>> http://svn.collab.net/repos/svn/trunk/notes/fsfs in the "Locking"
>> section indicate that there might be some issues with NFS. Can anyone
>> confirm or deny this? Are any issues with with FSFS repositories and
>> NFS/NAS, any special NFS mount options, performance issues, etc.
>> Thanks,
>> Justin
> Yeah, I had mentioned that as well one time back in a posting here, I was
> quickly told that wasn't the case any more and that the book needs to be
> updated there because of FSFS.
> Johnathan

Here's an earlier thread that dealt with clustering of Subversion. In particular check the responses from Ryan Schmidt and Garrett Rooney. Hope this helps,



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Received on Wed Jan 31 20:45:13 2007

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