linux-kernel - Re: Stop SSD from waiting for "Spinning up disk..."

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Message-ID: <CAAJw_Zv08PnS4bU_k8J2E-dQfH_3PdB6SbenaeYzAaAOG4trFg@mail.gmail.com>
Date:	Thu, 25 Jun 2015 16:52:36 +0800
From:	Jeff Chua <jeff.chua.linux@...il.com>
To:	Martin Steigerwald <martin@...htvoll.de>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andreas Mohr <andi@...as.de>,
	lkml <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@....de>
Subject: Re: Stop SSD from waiting for "Spinning up disk..."

On Thu, Jun 25, 2015 at 2:08 PM, Martin Steigerwald <martin@...htvoll.de> 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
>> >
>> > <gregkh@...uxfoundation.org> 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.
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