Message-ID: <447C918F.2080801@emc.com>
Date: Tue, 30 May 2006 14:40:15 -0400
From: Ric Wheeler <ric@emc.com>
Reply-To: ric@emc.com
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To: Linus Torvalds <torvalds@osdl.org>
CC: Mark Lord <liml@rtr.ca>, Benjamin Herrenschmidt <benh@kernel.crashing.org>,
       Jeff Garzik <jeff@garzik.org>, Andrew Morton <akpm@osdl.org>,
       linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [git patch] libata resume fix
References: <20060528203419.GA15087@havoc.gtf.org> <1148938482.5959.27.camel@localhost.localdomain> <447C4718.6090802@rtr.ca> <Pine.LNX.4.64.0605301122340.5623@g5.osdl.org>
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Linus Torvalds wrote:

>On Tue, 30 May 2006, Mark Lord wrote:
>  
>
>>Not in a suspend/resume capable notebook, though.
>>
>>I don't know of *any* notebook drives that take longer
>>than perhaps five seconds to spin-up and accept commands.
>>Such a slow drive wouldn't really be tolerated by end-users,
>>which is why they don't exist.
>>    
>>
>
>Indeed. In fact, I'd be surprised to see it in a desktop too.
>
>At least at one point, in order to get a M$ hw qualification (whatever 
>it's called - but every single hw manufacturer wants it, because some 
>vendors won't use your hardware if you don't have it), a laptop needed to 
>boot up in less than 30 seconds or something.
>
>And that wasn't the disk spin-up time. That was the time until the Windows 
>desktop was visible.
>
>Desktops could do a bit longer, and I think servers didn't have any time 
>limits, but the point is that selling a disk that takes a long time to 
>start working is actually not that easy. 
>
>The market that has accepted slow bootup times is historically the server 
>market (don't ask me why - you'd think that with five-nines uptime 
>guarantees you'd want fast bootup), and so you'll find large SCSI disks in 
>particular with long spin-up times. In the laptop and desktop space I'd be 
>very surprised to see anythign longer than a few seconds.
>
>		Linus
>  
>
With many data centera applications, delayed spin up of SCSI (and 
increasingly S-ATA) drives is a feature meant to avoid blowing a circuit 
when you spin up too many drives at once ;-)

Ric

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