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Message-id: <4626A303.80208@shaw.ca> Date: Wed, 18 Apr 2007 17:00:19 -0600 From: Robert Hancock <hancockr@...w.ca> To: Tejun Heo <htejun@...il.com>, linux-kernel <linux-kernel@...r.kernel.org> Cc: Mark Lord <liml@....ca> Subject: Re: Loud "pop" coming from hard drive on reboot Tejun Heo wrote: > This really isn't a regression. It's been always like that with libata. > libata doesn't make devices go into standby mode and shutdown(8) does > it for libata. The problem here is that libata does issue > SYNCHRONIZE_CACHE on shutdown. So, the sequence of event is... > > 1. shutdown(8) issues SYNCHRONIZE_CACHE followed by STANDBY_NOW This part is presumably distribution dependent. I have never seen Fedora or CentOS shut down drives on power down from the shutdown script/utility.. > 2. kernel shutdown starts > 3. libata shutdown issues SYNCHRONIZE_CACHE > 4. power goes off > > Some drives seem to spin up at step #3 even when its cache is clean and > power goes off right after the disk finishes the command. So, it's > really bad when it happens - spin down, spin up followed by immediate > power off. -- Robert Hancock Saskatoon, SK, Canada To email, remove "nospam" from hancockr@...pamshaw.ca Home Page: http://www.roberthancock.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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