From mboxrd@z Thu Jan 1 00:00:00 1970 From: "H. Peter Anvin" Subject: Re: [ANNOUNCE] util-linux-ng v2.17 (stable) Date: Sun, 10 Jan 2010 23:27:10 -0800 Message-ID: <4B4AD2CE.8040207@zytor.com> References: <20100108093302.GS1969@nb.net.home> <4B47A713.9060405@zytor.com> <329167C1-CF54-4742-B0B7-AD0B9DEFDEC1@sun.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: Andreas Dilger , Karel Zak , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, util-linux-ng-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: "Martin K. Petersen" Return-path: In-Reply-To: Sender: util-linux-ng-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-fsdevel.vger.kernel.org On 01/10/2010 10:36 PM, Martin K. Petersen wrote: >>>>>> "Andreas" == Andreas Dilger writes: > > Andreas> I agree whole heartedly. We steer users very sharply away from > Andreas> using partitions at all, because on h/w RAID devices the > Andreas> 512-byte offset from fdisk completely kills RAID-5/6 > Andreas> performance. > > I don't have a problem aligning to 1MB (taking alignment_offset into > account) by default but there needs to be an easy override. There are > RAID arrays that internally compensate for the legacy 63 sector offset > and we'll cause misalignment if we start at 1MB on those. > > I'm heavily lobbying our storage partners to make sure they fill out the > right SCSI bits if their LUNs are not naturally aligned. But there are > obviously going to be legacy devices out there that will need manual > alignment compensation. > Yes, but we shouldn't default to braindead mode. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. -- To unsubscribe from this list: send the line "unsubscribe util-linux-ng" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html