Re: Problem identified: WAPL/RAIDframe performance problems

[Thor Lancelot Simon <tls%panix.com@localhost>]

On Wed, Nov 28, 2012 at 06:41:28PM +0100, J. Hannken-Illjes wrote:
> On Nov 28, 2012, at 6:02 PM, Greg Troxel <gdt%ir.bbn.com@localhost> wrote:
> > Do you see this on RAID-1 too?
> > 
> > I wonder if it's possible (easily) to make the log only use fsbize
> > boundaries, (maybe forcing it to be bigger as a side effect.)
> 
> Sure -- add fsbsize sized buffer to struct wapbl and teach wapbl_write()
> to collect data until the buffers start or end touches a fsbsize boundary.

It is worth looking at the extensive work they did on this in XFS.