linux-kernel - Re: Integration of SCST in the mainstream Linux kernel

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Message-ID: <e2e108260802060222p294abff9kde72bbb04a115752@mail.gmail.com>
Date:	Wed, 6 Feb 2008 11:22:00 +0100
From:	"Bart Van Assche" <bart.vanassche@...il.com>
To:	"Jeff Garzik" <jeff@...zik.org>
Cc:	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	"James Bottomley" <James.Bottomley@...senpartnership.com>,
	"Vladislav Bolkhovitin" <vst@...b.net>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"FUJITA Tomonori" <fujita.tomonori@....ntt.co.jp>,
	linux-scsi@...r.kernel.org, scst-devel@...ts.sourceforge.net,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Mike Christie" <michaelc@...wisc.edu>
Subject: Re: Integration of SCST in the mainstream Linux kernel

On Feb 5, 2008 6:50 PM, Jeff Garzik <jeff@...zik.org> wrote:
> For remotely accessing data, iSCSI+fs is quite simply more overhead than
> a networked fs.  With iSCSI you are doing
>
>         local VFS -> local blkdev -> network
>
> whereas a networked filesystem is
>
>         local VFS -> network

There are use cases than can be solved better via iSCSI and a
filesystem than via a network filesystem. One such use case is when
deploying a virtual machine whose data is stored on a network server:
in that case there is only one user of the data (so there are no
locking issues) and filesystem and block device each run in another
operating system: the filesystem runs inside the virtual machine and
iSCSI either runs in the hypervisor or in the native OS.

Bart Van Assche.
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