From: Edward Falk <efalk@google.com>
To: Tejun Heo <htejun@gmail.com>
Cc: Fredrik Sjoholm <fredrik@sjoholm.com>,
Jeremy Jackson <jerj@coplanar.net>,
Jeff Garzik <jgarzik@pobox.com>,
linux-ide@vger.kernel.org
Subject: Re: libata SATA support for Sil 3726 port multiplier
Date: Tue, 18 Jul 2006 17:21:02 -0700 [thread overview]
Message-ID: <44BD7AEE.8020805@google.com> (raw)
In-Reply-To: <44BD72BD.70105@gmail.com>
> Yes, we have yet to implement staggered spinup support with someway to
> control the number of concurrently spun up devices. It's on my agenda.
> SATA staggered spinup is enabled by loading certain pin in the power
> connector during power-up. So, it is the enclosure which determines
> whether staggered spin-up is enabled or disabled. Your enclosure may
> have a dip switch or something to control that.
Doing staggered spinup properly is a tricky thing -- the sequence that
spins up the drive is the same sequence that detects the drive. This
means that simply probing the controller for disk drives will spin them
up. So staggered spinup means staggered probling. Tricky.
-ed falk
prev parent reply other threads:[~2006-07-19 0:22 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-04 5:53 libata SATA support for Sil 3726 port multiplier Fredrik Sjoholm
2006-07-11 16:24 ` Jeremy Jackson
2006-07-12 2:17 ` Fredrik Sjoholm
2006-07-18 23:46 ` Tejun Heo
2006-07-18 23:55 ` Fredrik Sjoholm
2006-07-19 0:21 ` Edward Falk [this message]
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