Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755674Ab0BDCiC (ORCPT ); Wed, 3 Feb 2010 21:38:02 -0500 Received: from smtp-out.google.com ([216.239.33.17]:44360 "EHLO smtp-out.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751477Ab0BDCh6 convert rfc822-to-8bit (ORCPT ); Wed, 3 Feb 2010 21:37:58 -0500 DomainKey-Signature: a=rsa-sha1; s=beta; d=google.com; c=nofws; q=dns; h=mime-version:in-reply-to:references:date:message-id:subject:from:to: cc:content-type:content-transfer-encoding:x-system-of-record; b=IY7ybKhdFM+po9n7sHDQWWvYUTsgf1pxkxxI6SphZBUvuJ7rajBm5LNIGavvUyb7e eEg9Kyo289GtRujcPrZwQ== MIME-Version: 1.0 In-Reply-To: <4B687B7C.2070406@gmail.com> References: <4B5885F7.2020007@gmail.com> <4B679EA9.6030203@kernel.org> <4B6833DD.1020001@gmail.com> <4B683581.7070708@kernel.org> <4B683DEF.3000302@gmail.com> <4B686B2B.2080406@gmail.com> <4B687B7C.2070406@gmail.com> Date: Wed, 3 Feb 2010 18:37:53 -0800 Message-ID: Subject: Re: port multiplier problem From: Grant Grundler To: Chandra Shekhar Sah Cc: Tejun Heo , linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT X-System-Of-Record: true Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3038 Lines: 100 On Tue, Feb 2, 2010 at 11:22 AM, Chandra Shekhar Sah wrote: > Hi Grant, > > Thank for reply. > Yes, PMP is sil3726. The backplane of the disk array has two PMP (each > 1-to-5 as you have mentioned) and two sata direct connection without PMP. > So, 10 disk are behind 2 PMP. Ah ok. That explains your "5-5-1-1" comment now. I tried to find a Data sheet for this board but only found one in Chinese: www.norco.com.cn/UpLoadFile/Manual/DS-12X0-CN.pdf and I unfortunately don't speak/read chinese. Probably doesn't matter though since... This email thread looks like a duplicate of a previous bug report: http://markmail.org/message/lp3ynvfefejpiy2r (or search for "Ubuntu 9.04 (2.6.28-14) and eSATA Port Multiplier (PMP) Not working") Chandra, you might read through that thread and dmesg output (posted by Chris K) to see what else you have in common. I had two questions on that thread that never got answered: http://markmail.org/message/snpekoj4qexrslk5 | How can we find out if anyone has the SEMB properly wired up? | Would it be hard to make libata aware of "SEMB port not responding" case? | ie if the SEMB port times out or has no link, reduce the port count of | the sil3726 PMP by one. | | Maybe add a "enable_sil24_semb" flag to libata? | (avoid checking unless someone asks for it). I hate magic flags but also | don't want to subject most people to the timeout delay. I (or Gwendal) can post a patch (and lightly test) for any of the above. Just need to get some guidance so we don't waste our time. thanks, grant > Total is 12 disks. The sata host controller is > sil3124. Picture of the backplane is attached. > > Thanks, > Chandra > > On 2/2/10 2:04 PM, Grant Grundler wrote: >> >> On Tue, Feb 2, 2010 at 10:12 AM, Chandra Shekhar Sah >>  wrote: >> >>> >>> Hi Grant, >>> >>> There are 6 Seagate Barracuda and 6 Hitachi DeskStar. >>> >> >> I thought 0x1095/0x3726 was a Silicon Image part. Can you confirm this? >> >> If it is, this sounds like a broken implementation to me. Here is what >> the Silicon Image 3726 Data Sheet says in the introduction: >>     Silicon Image’s SiI3726 is 1-to-5 SATA Port Multiplier designed to >> provide a high performance link between a single SATA host port and 5 >> SATA device ports. >> >> So I don't know where the 6th device is getting connected. Some >> explanation/data sheet from the HW vendor would be helpful at this >> point. >> >> >>> >>> Seagate Model: ST3750640AS >>> Firmware: 3.AAK >>> >>> Hitachi Model:HDS721075KLA330 >>> Firmware: Not sure >>> >> >> Both of these drives work behind Sil3726. (First hand experience). >> >> >>> >>> I have attached pictures of both labels, in case. >>> >> >> Perfect - thanks for posting those. >> >> thanks, >> grant >> >> > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/