From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jordan Russell Subject: Re: Data-check brings system to a standstill Date: Fri, 18 Jun 2010 12:27:32 -0500 Message-ID: <4C1BAC84.4090000@quo.to> References: <4C0FCFCD.4070201@quo.to> <4C19015B.3020807@tmr.com> <4C1BA880.1050609@seoss.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4C1BA880.1050609@seoss.co.uk> Sender: linux-raid-owner@vger.kernel.org To: Tim Small Cc: Bill Davidsen , linux-raid@vger.kernel.org List-Id: linux-raid.ids On 6/18/2010 12:10 PM, Tim Small wrote: > Have things switched to AHCI (or similar SATA controller) with NCQ > since? If so, do you drives have buggy firmware which makes them suck > with sequential reads when NCQ is enabled? See the libata wiki for > details - you can try disabling NCQ (or limiting queue depth to 2, or > whatever) to test it.... The disks are on an older Intel 6300ESB controller, which I'm fairly certain has no support for NCQ. ata4.00: ATA-7: WDC WD3200YS-01PGB0, 21.00M21, max UDMA/133 ata4.00: 625142448 sectors, multi 16: LBA48 NCQ (depth 0/1) ata3.00: ATA-7: WDC WD3200YS-01PGB0, 21.00M21, max UDMA/133 ata3.00: 625142448 sectors, multi 16: LBA48 NCQ (depth 0/1) -- Jordan Russell