From mboxrd@z Thu Jan 1 00:00:00 1970 From: sminded Subject: Faster read performance DURING (?) resync on raid10 Date: Thu, 25 Sep 2008 02:27:51 -0700 (PDT) Message-ID: <19666016.post@talk.nabble.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids I have done some automated scripted tests with bonnie++ over RAID10 and encryption, using different encryption cipher modes to evaluate the impact on I/O operations. The strange thing is that I can see a significant increase in read performance (about 20%) when running the tests DURING the raid resync phase directly after the raid creation as appose to running it after the resync, or after I create the array with --assume-clean (which skips initial resync). Have anyone noticed the same behaviour, and how can it be explained? Any ideas? Can someone else verify that they get the same result? -- View this message in context: http://www.nabble.com/Faster-read-performance-DURING-%28-%29-resync-on-raid10-tp19666016p19666016.html Sent from the linux-raid mailing list archive at Nabble.com.