On Tue, Feb 2, 2010 at 11:22 AM, Chandra Shekhar Sah <edu4madh@xxxxxxxxx> 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<edu4madh@xxxxxxxxx> >> 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-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html