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

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Message-ID: <20080514224132.GB19570@2ka.mipt.ru>
Date:	Thu, 15 May 2008 02:41:33 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Jamie Lokier <jamie@...reable.org>, 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 06:06:17PM -0400, Jeff Garzik (jeff@...zik.org) wrote:
> This is the core reason why I am so interested in distributed storage... 
>  a single storage device is usually slower than network wire speed. 
> Multiple nodes helps remove that limitation and max out the network.
> 
> I want to be able to stream data _faster_ than a single hard drive can 
> handle :)

In that case yes, network will _not_ be saturated and multiple
simultaneous streams will have a win, but POHMELFS client design was
specially created to increase network performance as much as possible,
since we can increase storage speed (add more drives, more RAM
for caches, better hardware), but can not easily increase network
bandwidth.

But, as was already noted, even being network bound, client-to-many
is likely a better solution from other points of view (like management
and/ro failure cases).

-- 
	Evgeniy Polyakov
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