geom mirror write performance problem

[Pawel Jakub Dawidek]

On Wed, Dec 07, 2005 at 10:59:45AM -0800, John-Mark Gurney wrote:
+> OxY wrote this message on Wed, Dec 07, 2005 at 18:50 +0100:
+> > i removed the each disk from mirror one-by-one and ran the tests:
+> > (when i removed one disk from the mirror the write speed was ok, 
+> > since i added it again, then they were slow..
+> > it was no difference which disk i did removed..)
+> 
+> I know this might be a stupid question, but did you wait for the mirror
+> to sync before doing your write test?

Did you?:)

+> pjd, does gmirror limit how fast it rebuilds the mirror?

Yes, via sysctls:

kern.geom.mirror.syncs_per_sec: Number of synchronizations requests per second
kern.geom.mirror.reqs_per_sync: Number of regular I/O requests per synchronization request

-- 
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!
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