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Message-ID: <49496F58.4030003@garzik.org> Date: Wed, 17 Dec 2008 16:30:00 -0500 From: Jeff Garzik <jeff@...zik.org> To: Andreas Dilger <adilger@....com> CC: Chris Mason <chris.mason@...cle.com>, Andrew Morton <akpm@...ux-foundation.org>, Christoph Hellwig <hch@...radead.org>, sfr@...b.auug.org.au, linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org, linux-fsdevel@...r.kernel.org Subject: Re: Notes on support for multiple devices for a single filesystem Andreas Dilger wrote: > I can't speak for btrfs, but I don't think multiple device access from > the filesystem is a "layering violation" as some people comment. It is > just a different type of layering. With ZFS there is a distinct layer > that is handling the allocation, redundancy, and transactions (SPA, DMU) > that is exporting an object interface, and the filesystem (ZPL, or future > versions of Lustre) is built on top of that object interface. Furthermore... think about object-based storage filesystems. They will need to directly issue SCSI commands to storage devices. Call it a layering violation if you will, but you simply cannot even pretend that an OSD is a linear block device for the purposes of our existing block layer. Jeff -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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