From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Martin K. Petersen" Subject: Re: Questions about 4k sector drives Date: Mon, 03 May 2010 16:27:16 -0400 Message-ID: References: <4BD42B57.9000703@kusche.de> <1272206601.7734.4.camel@faldara> <4BDE0512.8070502@tmr.com> <4BDED1F2.102@cfl.rr.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: In-Reply-To: <4BDED1F2.102@cfl.rr.com> (Phillip Susi's message of "Mon, 3 May 2010 09:38:58 -0400") Sender: linux-raid-owner@vger.kernel.org To: Phillip Susi Cc: Greg Freemyer , Bill Davidsen , Florian Kusche , linux-raid@vger.kernel.org, "Martin K. Petersen" List-Id: linux-raid.ids >>>>> "Phillip" == Phillip Susi writes: >> I don't know it any those drives exist yet, or if they ever will. >> But the kernel topology info specifically supports providing the >> above info and aiui parted uses it to choose the best partition >> layout. Phillip> AFAICS the kernel has a means of providing that information to Phillip> user space, and parted will use it if it is provided, but the Phillip> kernel has no means of obtaining that information from the Phillip> drive, so it is always left as unknown, so parted defaults to 1 Phillip> MB alignment like Windows 7. We have means of obtaining alignment and physical sector size information from both SCSI and ATA drives. But only if the drive firmware provides the information, of course. One currently shipping drive model on the market isn't reporting the bigger physical block size. But there are several other 4KB sector products out there that are working just fine. -- Martin K. Petersen Oracle Linux Engineering