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

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Date:	Wed, 06 Feb 2008 09:21:02 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Bart Van Assche <bart.vanassche@...il.com>
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

Bart Van Assche wrote:
> 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.

Hence the diskless root fs configuration I referred to in multiple 
emails...  whoopee, you reinvented NFS root with quotas :)

	Jeff



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