2.0 upgrade experiences

[Robert Collins]

On Thu, 2009-08-13 at 16:05 +1000, Andrew Cowie wrote:


> > Also, it doesn't seem that unreasonable to me that rather than even
> > try to work out when it is safe, we transiently use a bit more disk
> > space that will later be collected.  So I think it's partly a problem
> > of communication.
> 
> Frankly, the problem is a marketing one.

One thing we could do is, on upgrade:
 - pack automatically (we do this)
 - fsync()
 - clean obsoleted packs.

I'm comfortable with the performance hit and small loss window this
would introduce because:
 - upgrade is very rare (compare to 'pull' or 'commit')
 - I only know of one consumer platform that makes fsync-not-fsync.

Folk using xfs without battery backed up raid arrays on UPS's get what
they deserve :)

-Rob
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