On Tue, 19 Sep 2006, FRLinux wrote:
> Holy war ! Seriously, go and tell your users they've got a quick
> network, but because you don't trust your speed so you have to
> force them to run at a 10th of the speed ?
Again, this problem started recently for him, IIUC. So it's got
nothing to do with sync/async.
And it's not about "trusting your speed", it's about data integrity.
Async violates NFS data consistency rules, there's a reason sync
became the default over async. Further, sync can be reasonably fast
with NFSv3 (which has an explicit COMMIT operation) and filesystems
which support some fast data-sync operation (e.g. ext3 in
data=journalled mode).
It's not good to just willy-nilly advise people to use async to
'solve' performance problems, without mentioning the risk.
Particularly not when it seems his performance problem has /nothing/
to do with sync!
That said, he's mounting these filesystems with 'soft', so doesn't
care about data integrity - 'async' adds a different risk though.
regards,
--
Paul Jakma paul at clubi.iepaul at jakma.org Key ID: 64A2FF6A
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