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Re: Integration of SCST in the mainstream Linux kernel

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To: Bart Van Assche <bart.vanassche@...>
Cc: Linus Torvalds <torvalds@...>, J. Bruce Fields <bfields@...>, Nicholas A. Bellinger <nab@...>, James Bottomley <James.Bottomley@...>, Vladislav Bolkhovitin <vst@...>, Andrew Morton <akpm@...>, FUJITA Tomonori <fujita.tomonori@...>, <linux-scsi@...>, <scst-devel@...>, Linux Kernel Mailing List <linux-kernel@...>, Mike Christie <michaelc@...>
Date: Tuesday, February 5, 2008 - 1:50 pm

Bart Van Assche wrote:

async performs better than sync...  this is news?  Furthermore, NFSv4 
has not only async capability but delegation too (and RDMA if you like 
such things), so the comparison is not relevant to modern times.

But a networked filesystem (note I'm using that term, not "NFS", from 
here on) is simply far more useful to the average user.  A networked 
block device is a building block -- and a useful one.  A networked 
filesystem is an immediately usable solution.

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

iSCSI+fs also adds new manageability issues, because unless the 
filesystem is single-computer (such as diskless iSCSI root fs), you 
still need to go across the network _once again_ to handle filesystem 
locking and coordination issues.

There is no _fundamental_ reason why remote shared storage via iSCSI OSD 
  is any faster than a networked filesystem.


SCSI-over-IP has its uses.  Absolutely.  It needed to be standardized. 
But let's not pretend iSCSI is anything more than what it is.  Its a 
bloated cat5 cabling standard :)

	Jeff



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Messages in current thread:
Integration of SCST in the mainstream Linux kernel, Bart Van Assche, (Wed Jan 23, 10:22 am)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Tue Feb 5, 3:02 pm)
Re: Integration of SCST in the mainstream Linux kernel, Bart Van Assche, (Tue Feb 5, 3:02 pm)
Re: Integration of SCST in the mainstream Linux kernel, James Bottomley, (Tue Jan 29, 4:42 pm)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Wed Jan 30, 7:17 am)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Mon Feb 4, 8:27 am)
Re: Integration of SCST in the mainstream Linux kernel, James Bottomley, (Mon Feb 4, 11:30 am)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Mon Feb 4, 12:25 pm)
Re: Integration of SCST in the mainstream Linux kernel, James Bottomley, (Mon Feb 4, 1:06 pm)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Mon Feb 4, 1:16 pm)
Re: Integration of SCST in the mainstream Linux kernel, James Bottomley, (Mon Feb 4, 1:25 pm)
Re: Integration of SCST in the mainstream Linux kernel, Linus Torvalds, (Mon Feb 4, 2:29 pm)
Re: Integration of SCST in the mainstream Linux kernel, Nicholas A. Bellinger, (Mon Feb 4, 3:06 pm)
Re: Integration of SCST in the mainstream Linux kernel, Linus Torvalds, (Mon Feb 4, 3:44 pm)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Tue Feb 5, 3:00 pm)
Re: Integration of SCST in the mainstream Linux kernel, Matt Mackall, (Mon Feb 4, 8:07 pm)
Re: Integration of SCST in the mainstream Linux kernel, Linus Torvalds, (Mon Feb 4, 8:24 pm)
Re: Integration of SCST in the mainstream Linux kernel, Matt Mackall, (Mon Feb 4, 8:45 pm)
Re: Integration of SCST in the mainstream Linux kernel, Douglas Gilbert, (Mon Feb 4, 1:30 pm)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Tue Feb 5, 3:01 pm)
Re: Integration of SCST in the mainstream Linux kernel, Nicholas A. Bellinger, (Tue Feb 5, 8:48 pm)
Re: Integration of SCST in the mainstream Linux kernel, Nicholas A. Bellinger, (Tue Feb 5, 8:51 pm)
Re: Integration of SCST in the mainstream Linux kernel, Nicholas A. Bellinger, (Tue Feb 5, 8:17 pm)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Tue Feb 5, 3:21 pm)
Re: Integration of SCST in the mainstream Linux kernel, Nicholas A. Bellinger, (Tue Feb 5, 8:11 pm)
Re: [Scst-devel] Integration of SCST in the mainstream Linux..., Nicholas A. Bellinger, (Tue Feb 12, 11:44 pm)
CONFIG_SLUB and reproducable general protection faults on 2...., Nicholas A. Bellinger, (Wed Feb 13, 2:18 am)
Re: CONFIG_SLUB and reproducable general protection faults o..., Nicholas A. Bellinger, (Wed Feb 13, 12:37 pm)
Re: Integration of SCST in the mainstream Linux kernel, Nicholas A. Bellinger, (Tue Feb 5, 9:43 pm)
Re: Integration of SCST in the mainstream Linux kernel, Linus Torvalds, (Mon Feb 4, 7:27 pm)
Re: Integration of SCST in the mainstream Linux kernel, James Bottomley, (Mon Feb 4, 7:00 pm)
Re: Integration of SCST in the mainstream Linux kernel, Nicholas A. Bellinger, (Mon Feb 4, 7:12 pm)
Re: Integration of SCST in the mainstream Linux kernel, James Bottomley, (Tue Feb 5, 2:37 pm)
Re: Integration of SCST in the mainstream Linux kernel, Nicholas A. Bellinger, (Mon Feb 4, 7:16 pm)
Re: Integration of SCST in the mainstream Linux kernel, Nicholas A. Bellinger, (Mon Feb 4, 6:59 pm)
Re: Integration of SCST in the mainstream Linux kernel, J. Bruce Fields, (Mon Feb 4, 5:01 pm)
Re: Integration of SCST in the mainstream Linux kernel, Linus Torvalds, (Mon Feb 4, 5:24 pm)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Tue Feb 5, 3:01 pm)
Re: Integration of SCST in the mainstream Linux kernel, Olivier Galibert, (Tue Feb 5, 9:05 am)
Re: Integration of SCST in the mainstream Linux kernel, Bart Van Assche, (Tue Feb 5, 4:38 am)
Re: Integration of SCST in the mainstream Linux kernel, Jeff Garzik, (Tue Feb 5, 1:50 pm)
Re: Integration of SCST in the mainstream Linux kernel, Bart Van Assche, (Wed Feb 6, 6:22 am)
Re: Integration of SCST in the mainstream Linux kernel, Jeff Garzik, (Wed Feb 6, 10:21 am)
Re: Integration of SCST in the mainstream Linux kernel, Linus Torvalds, (Mon Feb 4, 7:45 pm)
Re: Integration of SCST in the mainstream Linux kernel, Linus Torvalds, (Mon Feb 4, 9:20 pm)
Re: Integration of SCST in the mainstream Linux kernel, Nicholas A. Bellinger, (Mon Feb 4, 6:00 pm)
Re: Integration of SCST in the mainstream Linux kernel, Nicholas A. Bellinger, (Mon Feb 4, 4:24 pm)
Re: Integration of SCST in the mainstream Linux kernel, Nicholas A. Bellinger, (Mon Feb 4, 3:19 pm)
Re: Integration of SCST in the mainstream Linux kernel, James Bottomley, (Mon Feb 4, 2:49 pm)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Mon Feb 4, 1:56 pm)
Re: Integration of SCST in the mainstream Linux kernel, James Bottomley, (Mon Feb 4, 2:22 pm)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Mon Feb 4, 2:38 pm)
Re: Integration of SCST in the mainstream Linux kernel, James Bottomley, (Mon Feb 4, 2:54 pm)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Tue Feb 5, 2:59 pm)
Re: Integration of SCST in the mainstream Linux kernel, James Bottomley, (Tue Feb 5, 3:13 pm)
Re: [Scst-devel] Integration of SCST in the mainstream Linux..., Nicholas A. Bellinger, (Thu Feb 7, 11:38 am)
Re: [Scst-devel] Integration of SCST in the mainstream Linux..., Nicholas A. Bellinger, (Fri Feb 8, 7:53 am)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Fri Feb 8, 10:42 am)
Re: Integration of SCST in the mainstream Linux kernel, Nicholas A. Bellinger, (Fri Feb 8, 8:00 pm)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Fri Feb 8, 6:32 am)
Re: Integration of SCST in the mainstream Linux kernel, Luben Tuikov, (Sat Feb 9, 3:32 am)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Mon Feb 11, 6:02 am)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Thu Feb 7, 9:45 am)
Re: Integration of SCST in the mainstream Linux kernel, Bart Van Assche, (Fri Feb 15, 11:02 am)
Re: Integration of SCST in the mainstream Linux kernel, Nicholas A. Bellinger, (Fri Feb 8, 7:33 am)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Fri Feb 8, 10:36 am)
Re: Integration of SCST in the mainstream Linux kernel, Nicholas A. Bellinger, (Fri Feb 8, 7:53 pm)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Fri Feb 8, 6:37 am)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Wed Feb 6, 2:07 pm)
Re: Integration of SCST in the mainstream Linux kernel, Bart Van Assche, (Mon Feb 4, 9:53 am)
Re: Integration of SCST in the mainstream Linux kernel, Bart Van Assche, (Tue Feb 5, 12:25 pm)
Re: Integration of SCST in the mainstream Linux kernel, Linus Torvalds, (Tue Feb 5, 2:18 pm)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Mon Feb 4, 1:08 pm)
Re: Integration of SCST in the mainstream Linux kernel, David Dillow, (Mon Feb 4, 1:00 pm)
Re: Integration of SCST in the mainstream Linux kernel, Bart Van Assche, (Wed Jan 30, 4:29 am)
Re: Integration of SCST in the mainstream Linux kernel, James Bottomley, (Wed Jan 30, 12:22 pm)
Re: [Scst-devel] Integration of SCST in the mainstream Linux..., Tomasz Chmielewski, (Tue Feb 5, 3:14 am)
Re: [Scst-devel] Integration of SCST in the mainstream Linux..., Nicholas A. Bellinger, (Tue Feb 5, 10:01 pm)
Re: [Scst-devel] Integration of SCST in the mainstream Linux..., Tomasz Chmielewski, (Tue Feb 5, 12:07 pm)
Re: Integration of SCST in the mainstream Linux kernel, Bart Van Assche, (Wed Jan 30, 1:03 pm)
Re: Integration of SCST in the mainstream Linux kernel, Roland Dreier, (Tue Jan 29, 5:31 pm)
Re: Integration of SCST in the mainstream Linux kernel, FUJITA Tomonori, (Tue Jan 29, 7:32 pm)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Wed Jan 30, 7:18 am)
Re: Integration of SCST in the mainstream Linux kernel, Bart Van Assche, (Wed Jan 30, 4:38 am)
Re: Integration of SCST in the mainstream Linux kernel, Bart Van Assche, (Wed Feb 6, 8:16 am)
Re: Integration of SCST in the mainstream Linux kernel, Erez Zilber, (Mon Feb 18, 5:43 am)
Re: Integration of SCST in the mainstream Linux kernel, Bart Van Assche, (Mon Feb 18, 7:01 am)
Re: Integration of SCST in the mainstream Linux kernel, Erez Zilber, (Wed Feb 20, 3:34 am)
Re: Integration of SCST in the mainstream Linux kernel, Bart Van Assche, (Wed Feb 20, 4:41 am)
Re: Integration of SCST in the mainstream Linux kernel, Roland Dreier, (Wed Feb 6, 1:06 pm)
Re: Integration of SCST in the mainstream Linux kernel, Benny Halevy, (Wed Feb 6, 12:45 pm)
Re: Integration of SCST in the mainstream Linux kernel, James Bottomley, (Wed Jan 30, 12:34 pm)
Re: Integration of SCST in the mainstream Linux kernel, Pete Wyckoff, (Sat Feb 2, 11:32 am)
Re: Integration of SCST in the mainstream Linux kernel, Bart Van Assche, (Wed Jan 30, 12:50 pm)
Re: Integration of SCST in the mainstream Linux kernel, FUJITA Tomonori, (Wed Jan 30, 6:56 am)
Re: Integration of SCST in the mainstream Linux kernel, Nicholas A. Bellinger, (Thu Jan 31, 9:25 am)
Re: Integration of SCST in the mainstream Linux kernel, Bart Van Assche, (Fri Feb 1, 4:11 am)
Re: Integration of SCST in the mainstream Linux kernel, Nicholas A. Bellinger, (Fri Feb 1, 6:39 am)
Re: Integration of SCST in the mainstream Linux kernel, Bart Van Assche, (Fri Feb 1, 7:04 am)
Re: Integration of SCST in the mainstream Linux kernel, Nicholas A. Bellinger, (Fri Feb 1, 8:05 am)
Re: Integration of SCST in the mainstream Linux kernel, Bart Van Assche, (Fri Feb 1, 9:25 am)
Re: Integration of SCST in the mainstream Linux kernel, Nicholas A. Bellinger, (Fri Feb 1, 10:36 am)
Re: Integration of SCST in the mainstream Linux kernel, Bart Van Assche, (Thu Jan 31, 10:34 am)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Thu Jan 31, 11:50 am)
Re: Integration of SCST in the mainstream Linux kernel, Nicholas A. Bellinger, (Thu Jan 31, 1:14 pm)
Re: Integration of SCST in the mainstream Linux kernel, Bart Van Assche, (Thu Jan 31, 1:40 pm)
Re: Integration of SCST in the mainstream Linux kernel, Nicholas A. Bellinger, (Thu Jan 31, 2:15 pm)
Re: Integration of SCST in the mainstream Linux kernel, Bart Van Assche, (Fri Feb 1, 5:08 am)
Re: [Scst-devel] Integration of SCST in the mainstream Linux..., Vladislav Bolkhovitin, (Fri Feb 1, 7:50 am)
Re: [Scst-devel] Integration of SCST in the mainstream Linux..., Vladislav Bolkhovitin, (Fri Feb 1, 8:25 am)
Re: [Scst-devel] Integration of SCST in the mainstream Linux..., Vladislav Bolkhovitin, (Fri Feb 1, 7:50 am)
Re: Integration of SCST in the mainstream Linux kernel, Nicholas A. Bellinger, (Thu Jan 31, 10:44 am)
Re: Integration of SCST in the mainstream Linux kernel, Bart Van Assche, (Wed Jan 30, 9:10 am)
Re: Integration of SCST in the mainstream Linux kernel, FUJITA Tomonori, (Wed Jan 30, 9:54 am)
Re: Integration of SCST in the mainstream Linux kernel, Bart Van Assche, (Thu Jan 31, 3:48 am)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Wed Jan 30, 7:40 am)
Re: Integration of SCST in the mainstream Linux kernel, Vladislav Bolkhovitin, (Wed Jan 23, 1:11 pm)
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