Re: [rdiff-backup-users] cygwin fsyncing again

[Ben Escoto]

>>>>> Dave Kempe <address@hidden>
>>>>> wrote the following on Thu, 29 Sep 2005 09:02:49 +1000
> Hi,
> I am trying to get rdiff-backup 1.0.1 going on cygwin. I will have a 
> windows package built shortly, but I would love it if windows-> windows 
> backups worked.
> the initial backup works ok, but after the session stats are printed at 
> the end I get an error similar to the one below. Thats fine, but 
> subsequent backups crash with the error below before copying any files. 
> I think os.fsync is not available on cygwin python2.4 and is erroneously 
> turned on...
> 
> Let me know if there any other information you need to help me out - is 
> there some way I can turn off fsyncing on cygwin?

rdiff-backup needs some way to order writes.  For instance, when
updating it sometimes needs to make sure a file is fully written
before it is moved.  Many optimized file systems will mess with the
order of these operations for better performance (at least this is
what the ext2/3 people told me).

So without fsync, how can rdiff-backup be guaranteed everything is
written in the right order?

It would be easy to add a check and then just disable fsyncing if it's
not available, but I don't think this would be entirely safe.


-- 
Ben Escoto

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