Re: [Lsf-pc] [LSF/MM TOPIC] really large storage sectors - goingbeyond 4096 bytes

From: Chris Mason
Date: Wed Jan 22 2014 - 15:13:43 EST

On Wed, 2014-01-22 at 11:50 -0800, Andrew Morton wrote:
+AD4- On Wed, 22 Jan 2014 11:30:19 -0800 James Bottomley wrote:
+AD4- +AD4- But this, I think, is the fundamental point for debate. If we can pull
+AD4- +AD4- alignment and other tricks to solve 99+ACU- of the problem is there a need
+AD4- +AD4- for radical VM surgery? Is there anything coming down the pipe in the
+AD4- +AD4- future that may move the devices ahead of the tricks?
+AD4- I expect it would be relatively simple to get large blocksizes working
+AD4- on powerpc with 64k PAGE+AF8-SIZE. So before diving in and doing huge
+AD4- amounts of work, perhaps someone can do a proof-of-concept on powerpc
+AD4- (or ia64) with 64k blocksize.

Maybe 5 drives in raid5 on MD, with 4K coming from each drive. Well
aligned 16K IO will work, everything else will about the same as a rmw
from a single drive.


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