Date: Wed, 01 Nov 2000 16:57:46 -0500 From: "John R. LoVerso" <john@loverso.southborough.ma.us> To: freebsd-scsi@freebsd.org Subject: Re: iostat: tps for SCSI drives ... Message-ID: <200011012157.QAA91048@h201.infolibria.com>
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This thread has made me wonder. I have a RAID-5 array connected to a DPT-5 controller using the "asr" driver in 4.1.1-R, but it is not using tagged queueing. The DPT-5 does use tagged queueing on another disk on the same controller: % camcontrol tags da0 (pass0:asr0:0:0:0): device openings: 255 % camcontrol tags da1 -v (pass1:asr0:0:1:0): dev_openings 1 (pass1:asr0:0:1:0): dev_active 0 (pass1:asr0:0:1:0): devq_openings 1 (pass1:asr0:0:1:0): devq_queued 0 (pass1:asr0:0:1:0): held 0 (pass1:asr0:0:1:0): mintags 0 (pass1:asr0:0:1:0): maxtags 255 and from a verbose boot: domino0: <Adaptec Caching Memory Controller> mem 0xfc000000-0xfdffffff,0xf8200000-0xf820ffff irq 23 at device 3.0 on pci1 asr0: <Adaptec Caching SCSI RAID> port 0x2000-0x20ff mem 0xf8400000-0xf85fffff irq 16 at device 4.0 on pci1 asr0: major=154 asr0: DPT PM3754U2 FW Rev. 3010, 3 channel, 256 CCBs, Protocol I2O pass0 at asr0 bus 0 target 0 lun 0 pass0: <IBM DRVS09V 0140> Fixed Direct Access SCSI-3 device pass0: Serial Number 13011695HA pass0: Tagged Queueing Enabled pass1 at asr0 bus 0 target 1 lun 0 pass1: <DPT RAID-5 3010> Fixed Direct Access SCSI-2 device da0 at asr0 bus 0 target 0 lun 0 da0: <IBM DRVS09V 0140> Fixed Direct Access SCSI-3 device da0: Serial Number 13011695HA da0: Tagged Queueing Enabled da0: 8754MB (17928681 512 byte sectors: 255H 63S/T 1116C) da1 at asr0 bus 0 target 1 lun 0 da1: <DPT RAID-5 3010> Fixed Direct Access SCSI-2 device da1: 17507MB (35854336 512 byte sectors: 255H 63S/T 2231C) The RAID-5 is a "2+1" of three Seagate 39103LW drives. On a different machine with just an NCR controller, I do get tagged queueing with the drives: da0 at sym0 bus 0 target 0 lun 0 da0: <SEAGATE ST39103LW 0002> Fixed Direct Access SCSI-2 device da0: 40.000MB/s transfers (20.000MHz, offset 15, 16bit), Tagged Queueing Enabled da0: 8683MB (17783240 512 byte sectors: 255H 63S/T 1106C) Any idea why I don't see tagged queueing? Am I just confused (i.e., it shouldn't be enabled with a DPT-5 with a RAID-5)? Is I2O doing it under (and thus, transparent to) CAM? If I use "tags da1 -N 100", and start several concurrent operations on the disk, I do see tags in use: % camcontrol tags da1 -v (pass1:asr0:0:1:0): dev_openings 91 (pass1:asr0:0:1:0): dev_active 9 John To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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