Re: Problem identified: WAPL/RAIDframe performance problems

[David Holland <dholland-tech%netbsd.org@localhost>]

On Fri, Nov 30, 2012 at 12:00:52PM +0000, David Laight wrote:
 > > >I must look at how to determine that disks have 4k sectors and to
 > > >ensure filesystesm have 4k fragments - regardless of the fs size.
 > > 
 > > newfs should already ensure that fragment >= sector.
 > 
 > These disks lie about their actual sector size.
 > The disk's own software does RMW cycles for 512 byte writes.

Right, and it's important for FS code to be able to figure out what
the right atomic write size is... on the disk it's using, which might
not be the same as the disk that was newfs'd.

-- 
David A. Holland
dholland%netbsd.org@localhost