Date: Tue, 13 Apr 1999 22:14:26 -0600 (MDT) From: "Kenneth D. Merry" <ken@plutotech.com> To: jes@hal-pc.org (Jason) Cc: freebsd-scsi@FreeBSD.ORG Subject: Re: Tagged queueing problem with Seagate drive Message-ID: <199904140414.WAA00786@panzer.plutotech.com> In-Reply-To: <023801be8623$40608fc0$0500a8c0@local.nullifier.dyn.ml.org> from Jason at "Apr 13, 1999 10: 2:35 pm"
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Jason wrote... > This is a Seagate ST410080N that basically reports itself as a SX410080N and > thus the ST410080* quirk entry doesn't catch it. > > It typically needs a hard reset after locking up after reducing tags 1-3 > from 64. The drive is alone on the SCSI bus and properly terminated. I > currently don't have any error messages from when the drive locks up, though > the typical sense code is 0x151. > > relevant dmesg bits: > . > . > . > ahc0: <Adaptec aic7880 Ultra SCSI adapter> rev 0x00 int a irq 11 on > pci0.18.0 > ahc0: aic7880 Single Channel A, SCSI Id=7, 16/255 SCBs > . > . > . > da0: <SEAGATE SX410800N 7116> Fixed Direct Access SCSI-2 device > da0: 10.000MB/s transfers (10.000MHz, offset 15) > da0: 8347MB (17096357 512 byte sectors: 64H 32S/T 8347C) > . > . > . > > I've put a quick quirk entry for this drive with tags reduced to 32, and so > far, haven't had any problems, though I haven't tried any other settings to > test performance. You didn't reduce the number of tags to 32, you disabled tagged queueing altogether. When a drive is capable of tagged queueing and tagged queueing is enabled, you'll see dmesg info like this: da1 at ahc1 bus 0 target 1 lun 0 da1: <IBM DGVS09U 03B0> Fixed Direct Access SCSI-3 device da1: 40.000MB/s transfers (20.000MHz, offset 8, 16bit), Tagged Queueing Enabled da1: 8705MB (17829870 512 byte sectors: 255H 63S/T 1109C) Your drive probably needs the same quirk entry as the other Elite 9's with the 71xx firmware, which is why it has been working okay with tagged queueing disabled. Ken -- Kenneth Merry ken@plutotech.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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