linux-kernel - Re: [osd-dev] [PATCH 1/9] exofs: osd Swiss army knife

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Date:	Tue, 13 Jan 2009 10:17:10 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Jamie Lokier <jamie@...reable.org>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Benny Halevy <bhalevy@...asas.com>,
	Boaz Harrosh <bharrosh@...asas.com>,
	open-osd development <osd-dev@...n-osd.org>,
	Avishay Traeger <avishay@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...IV.linux.org.uk>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [osd-dev] [PATCH 1/9] exofs: osd Swiss army knife

Jamie Lokier wrote:
> Having one super block would be silly.

Yep.


> But aren't most kinds of replication better done behind the OSD level,
> on the storage fabric?  OSD is all about letting the fabric decide
> things like allocation and durability strategies after all.

Probably, but one cannot _assume_ that.  The OSD device might just be a 
dumb, non-replicated OSD simulator, or in the future, a singleton SATA 
drive.

	Jeff



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