svn commit: r217972 - projects/graid/head/sys/geom/raid

Alexander Motin mav at FreeBSD.org
Thu Jan 27 20:20:33 UTC 2011


On 27.01.2011 21:56, Warner Losh wrote:
>    (3) Update metadata after each bundle of slabs. (mav: please comment on
>        frequency)

I would do it once for every few minutes or few percents or some 
comparable number of gigabytes. Doing it more often is pointless, while 
it may significantly affect performance, as metadata write is 
synchronous now. gmirror does it every MAXPHYS * 100 bytes, but I would 
say that doing it every 12.8MB is too often for modern HDDs speeds.

-- 
Alexander Motin


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