From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stan Hoeppner Subject: Re: Very long raid5 init/rebuild times Date: Tue, 04 Feb 2014 12:43:31 -0600 Message-ID: <52F134D3.20704@hardwarefreak.com> References: <21217.9977.5869.747472@quad.stoffel.home> <20140121073540.GF10140@merlins.org> <20140121163755.GG10140@merlins.org> <52DF7976.6070808@hardwarefreak.com> <20140122174854.GF26014@merlins.org> <52E0807D.2030608@hardwarefreak.com> <20140123091319.GB2306@merlins.org> <52E10A07.3070302@hardwarefreak.com> <20140123210155.GJ10046@merlins.org> <52E1F685.3050300@hardwarefreak.com> <20140125083630.GA7555@merlins.org> <52E76054.5090900@hardwarefreak.com> <52EABA63.2060701@ubuntu.com> <52ED77A3.6020509@hardwarefreak.com> <52EE9445.2020202@ubuntu.com> <52EF3865.4000106@hardwarefreak.com> <52EFAACE.40906@ubuntu.com> <52F05ECD.5060804@hardwarefreak.com> <52F12A93.50408@SGI.com> <52F12CA0.1030803@ubuntu.com> Reply-To: stan@hardwarefreak.com Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <52F12CA0.1030803@ubuntu.com> Sender: linux-raid-owner@vger.kernel.org To: Phillip Susi , Larry Fenske Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On 2/4/2014 12:08 PM, Phillip Susi wrote: > Or the obvious and dropping the cache first, the way hdparm -t does. "hdparm -t" is a read test. Everything we've been discussing has been about maximizing write throughput. The fact that you argue this at this point makes it crystal clear that you don't have no understanding of the differences in the read/write paths and how buffer cache affects each differently. Further discussion is thus pointless. -- Stan