From: James Bottomley <James.Bottomley@SteelEye.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Nathan Bryant <nbryant@optonline.net>,
Pavel Machek <pavel@ucw.cz>,
Linux SCSI Reflector <linux-scsi@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Jeff Garzik <jgarzik@pobox.com>
Subject: Re: [PATCH] SCSI midlayer power management
Date: 11 Aug 2004 11:28:06 -0500 [thread overview]
Message-ID: <1092241693.1590.1.camel@mulgrave> (raw)
In-Reply-To: <1092237664.19009.23.camel@localhost.localdomain>
On Wed, 2004-08-11 at 10:21, Alan Cox wrote:
> In addition we are not doing SCSI target so multi-initiator is ok.
> One question James - what are the rules for power management with
> SCSI when we provide termpwr to a shared bus ?
I don't believe the spec addresses that.
The rules we use in HA are that each bus entity supplies termpwr (i.e.
all initiators and targets) and each terminator draws its power from the
bus). Thus the bus is properly terminated until the last device powers
down.
You have to jumper this specially on most SCSI cards (especially if
they're at the end of the bus and have internal termination).
James
next prev parent reply other threads:[~2004-08-11 16:28 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-10 23:58 [PATCH] SCSI midlayer power management Nathan Bryant
2004-08-11 8:09 ` Pavel Machek
2004-08-11 13:13 ` Nathan Bryant
2004-08-11 13:37 ` James Bottomley
2004-08-11 15:21 ` Alan Cox
2004-08-11 16:28 ` James Bottomley [this message]
2004-08-11 16:43 ` Nathan Bryant
2004-08-11 23:36 ` Benjamin Herrenschmidt
2004-08-12 7:45 ` Pavel Machek
2004-08-12 10:38 ` Benjamin Herrenschmidt
2004-08-12 12:48 ` James Bottomley
2004-08-12 13:14 ` Pavel Machek
2004-08-12 16:29 ` James Bottomley
2004-08-12 19:11 ` Pavel Machek
2004-08-12 19:34 ` James Bottomley
2004-08-12 20:26 ` Pavel Machek
2004-08-12 20:31 ` James Bottomley
2004-08-12 20:37 ` Pavel Machek
2004-08-12 20:42 ` James Bottomley
2004-08-12 20:48 ` Pavel Machek
2004-08-12 20:52 ` Nathan Bryant
2004-08-12 20:40 ` Nathan Bryant
2004-08-12 23:05 ` Benjamin Herrenschmidt
2004-08-12 22:36 ` Nigel Cunningham
2004-08-12 22:43 ` Nigel Cunningham
2004-08-12 23:04 ` Benjamin Herrenschmidt
2004-08-12 13:41 ` Nathan Bryant
2004-08-12 16:45 ` Patrick Mansfield
2004-08-12 23:02 ` Benjamin Herrenschmidt
2004-08-11 20:19 ` Pavel Machek
2004-08-11 20:50 ` Nathan Bryant
2004-08-11 22:16 ` Nigel Cunningham
2004-08-11 22:48 ` Nathan Bryant
2004-08-12 7:43 ` Pavel Machek
2004-08-12 9:39 ` Nigel Cunningham
2004-08-12 13:43 ` Nathan Bryant
-- strict thread matches above, loose matches on Subject: below --
2004-08-16 13:29 James.Smart
2004-08-10 23:56 Nathan Bryant
2004-08-11 9:53 ` Alan Cox
2004-08-11 12:55 ` Nathan Bryant
2004-08-11 13:39 ` James Bottomley
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1092241693.1590.1.camel@mulgrave \
--to=james.bottomley@steeleye.com \
--cc=alan@lxorguk.ukuu.org.uk \
--cc=jgarzik@pobox.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-scsi@vger.kernel.org \
--cc=nbryant@optonline.net \
--cc=pavel@ucw.cz \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox