Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751807AbbFYIwn (ORCPT ); Thu, 25 Jun 2015 04:52:43 -0400 Received: from mail-la0-f52.google.com ([209.85.215.52]:36577 "EHLO mail-la0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751256AbbFYIwi (ORCPT ); Thu, 25 Jun 2015 04:52:38 -0400 MIME-Version: 1.0 In-Reply-To: <2354996.jDU4uRfO83@merkaba> References: <20150623182612.GA27461@rhlx01.hs-esslingen.de> <20150625014152.GA9292@kroah.com> <2354996.jDU4uRfO83@merkaba> Date: Thu, 25 Jun 2015 16:52:36 +0800 Message-ID: Subject: Re: Stop SSD from waiting for "Spinning up disk..." From: Jeff Chua To: Martin Steigerwald Cc: Greg Kroah-Hartman , Andreas Mohr , lkml , Christoph Hellwig Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2084 Lines: 45 On Thu, Jun 25, 2015 at 2:08 PM, Martin Steigerwald wrote: > Am Mittwoch, 24. Juni 2015, 18:41:52 schrieb Greg Kroah-Hartman: >> On Thu, Jun 25, 2015 at 07:55:45AM +0800, Jeff Chua wrote: >> > On Thu, Jun 25, 2015 at 12:28 AM, Greg Kroah-Hartman >> > >> > wrote: >> > > On Thu, Jun 25, 2015 at 12:22:47AM +0800, Jeff Chua wrote: >> > >> Both sda and sdb have the same SSD model. >> > > >> > > That's a bug in your USB bridge chip, odds are it is not reporting the >> > > value properly. There's nothing the scsi core or USB stack can do >> > > about >> > > this, sorry. Please complain to the hardware manufacturer. >> > >> > There are workaround boot cmdline parameters for other things ... any >> > chance to consider one to fix broken rotational option? I'm not sure >> > how many out there are broken, but I really would like a faster way to >> > access my USB SSD without waiting for the "disk spinup". >> >> Just like module paramaters, boot command lines are not for device >> specific attributes, sorry. Again, please contact the manufacturer to >> get this fixed. We can't add a quirk for this bridge because it would >> not work if you really put a rotational disk behind it. > > How about a way to override it in sysfs directly during runtime just for a > device individually, like choosing an I/O scheduler for example? > >> Given the cheap cost of these types of bridges, I recommend just getting >> one that works. > > That is an option as well and may educate hardware manufacturers to look a > bit better at the quality of those devices (at least then Linux market share > in that market increases). I just needed something. "throwing" those cheap USB3 ... like I've a bunch of them. It's just a waste... and they are perfectly fast "uas" interfaces! Thanks, Jeff. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/