linux-kernel - Re: [PATCH #repost] SCSI: megaraid, fix suspend/resume sections

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Message-Id: <1209748533.239501.10.camel@localhost>
Date:	Fri, 02 May 2008 11:15:33 -0600
From:	Zan Lynx <zlynx@....org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	James Bottomley <James.Bottomley@...senPartnership.com>,
	jirislaby@...il.com, megaraidlinux@....com,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH #repost] SCSI: megaraid, fix suspend/resume sections

On Thu, 2008-05-01 at 15:30 -0700, Andrew Morton wrote:
[cut] 
> > CONFIG_HOTPLUG is only settable to 'n' if you're CONFIG_EMBEDDED which
> > has a zero set intersection with the users of megaraid, so in practical
> > terms, there's no actual box it could kill.
> 
> who suspends and resumes servers?

I read an article not long ago about a guy running an AMD renderfarm.
He was working on power management techniques, including suspending
systems that weren't in use.  It made a huge difference in power costs,
apparently.

I believe suspend is also used in some virtual server farms where
physical systems are resumed and virtuals are migrated to satisfy higher
CPU demands.

I could also see using it combined with a load balancer or proxy to
bring up backup web or database servers.

Compared to using networked/USB power bars or management controllers to
bring systems up and down, suspend/resume provides a faster response.
-- 
Zan Lynx <zlynx@....org>

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