Thanks! I have added a terminator to the SCSI bus and also turned on TCQ and now I can write out 100 MB in 10 seconds (as opposed to several minutes) Regards, Para-dox ([EMAIL PROTECTED]) ----- Original Message ----- From: "Trevor Hemsley" <[EMAIL PROTECTED]> To: "paradox3" <[EMAIL PROTECTED]> Sent: Sunday, January 28, 2001 8:56 PM Subject: Re: Poor SCSI drive performance on SMP machine, 2.2.16 > On Sun, 28 Jan 2001 19:58:04 -0500, paradox3 wrote: > > >I've attached the output in the kernel ring buffer as it initializes the > >scsi drive. I haven't been > >able to find IBM's website for DGHS09U to see if it self terminates. Maybe > >you > >can tell. > > Yeah, I have the PDF manual for that one here too - I used to have one. It's a Single ended > (ie not LVD), fast, wide 7200rpm drive with a 68 pin connector. It has a top speed of about > 14MB/sec. Pretty good drive in its day. It's the 7200rpm drive of the same generation as my > DGVS09U - the manual I have is dated October 1997. > > From the manual... > > Enable Active Termination > Single Ended 50 and 68 pin models are available with on card SCSI Bus Active Terminators. > The Active Termination feature can be enabled by installing a jumper between pins 13 and 14 > of the Front Option Jumper Block or connecting pins 9 and 10 of the Auxiliary Connector on > 68 SCSI pin models. SCA-2 80 pin has no termination. > > If you need more information about the drive, IBM are usually pretty good at keeping it on > their web site, http://www.storage.ibm.com should get you more. > > I'd guess you need to jumper pins 13+14 of the front jumper block *or* pins 9+10 of the jumper > block on the back that lies between the power connector and the 68 pin cable connector. On > the back connector pins 1+2 are the ones nearest the power connector. On the front connector > pin 1 is the lefthandmost pin when you look at it with the PCB downwards and the front of the > drive towards you. > > Since this looks like it's the only device you have attached to the controller then you should also > look in the BIOS setup (Ctrl-A at boot time) and find the section that talks about controller > termination. You can either set this to Automatic which usually works but sometimes gets it > wrong or you can set it to Low On/High ON which is correct if you have no external devices > and no devices attached to the internal 50 pin connector. > > > Trevor Hemsley, Brighton, UK. > [EMAIL PROTECTED] > > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
