netdev - Re: POHMELFS high performance network filesystem. Transactions, failover, performance.

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Message-ID: <20080514193843.GB10165@2ka.mipt.ru>
Date:	Wed, 14 May 2008 23:38:44 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Sage Weil <sage@...dream.net>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: POHMELFS high performance network filesystem. Transactions, failover, performance.

On Wed, May 14, 2008 at 03:03:40PM -0400, Jeff Garzik (jeff@...zik.org) wrote:
> >Well, it depends... If we are talking about single node perfromance,
> >then any protocol, which requries to wait for authorization (or any
> >approach, which waits for acknowledge just after data was sent) is slow.
> 
> Quite true, but IMO single-node performance is largely an academic 
> exercise today.  What production system is run without backups or 
> replication?

If cluster is made out of 2-3-4-10 machines, it does want to get maximum
single node performance. But I agree that in some cases we have to
sacrifice of something in order to find something new. And the larger
cluster becomes, for more things we can close eyes on.
 
-- 
	Evgeniy Polyakov
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