Date: Tue, 28 Jul 2015 22:18:43 -0400 From: Dan Langille <dan@langille.org> To: freebsd-scsi@freebsd.org Subject: Re: dmesg output not as expected Message-ID: <BFD44FE6-CCF0-4973-8893-86D7E58DF7C9@langille.org> In-Reply-To: <5A302DC6-C3EF-4DB1-8AD1-A0314C048A28@langille.org> References: <5A302DC6-C3EF-4DB1-8AD1-A0314C048A28@langille.org>
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> On Jul 28, 2015, at 1:01 PM, Dan Langille <dan@langille.org> wrote: > > I wish to move a tape library from one system to another. Today I moved the cable from one system to another and ran 'camcontrol rescan all'. > > For sa0, why do I see 80MB/s on the old system vs 40MB/s on the new system? Is this card related? Slot related? > > Similarly, ch0 goes from 20MB/s to 3.3MB/s.... > > I was hoping for a speed boost. :) > > Some of the camcontrol devlist output includes: > > <COMPAQ SuperDLT1 5F5F> at scbus14 target 1 lun 0 (pass11,sa0) > <COMPAQ MSL5000 Series 0520> at scbus14 target 3 lun 0 (pass12,ch0) > > This is on the existing system: > > I *think* this system holds a Symbios Ultra2 32-bit PCI SCSI Adapter SYM8951U > > Jul 23 13:24:19 knew kernel: sym0: <895> port 0xe000-0xe0ff mem 0xfebeec00-0xfebeecff,0xfebef000-0xfebeffff irq 22 at device 2.0 on pci4 > Jul 23 13:24:19 knew kernel: sym0: No NVRAM, ID 7, Fast-40, LVD, parity checking > > Jul 23 13:24:19 knew kernel: sa0 at sym0 bus 0 scbus7 target 1 lun 0 > Jul 23 13:24:19 knew kernel: sa0: <COMPAQ SuperDLT1 5F5F> Removable Sequential Access SCSI-2 device > Jul 23 13:24:19 knew kernel: sa0: Serial Number CXB46H0716 > Jul 23 13:24:19 knew kernel: sa0: 80.000MB/s transfers (40.000MHz, offset 31, 16bit) > > Jul 23 13:24:19 knew kernel: ch0 at sym0 bus 0 scbus7 target 3 lun 0 > Jul 23 13:24:19 knew kernel: ch0: <COMPAQ MSL5000 Series 0520> Removable Changer SCSI-2 device > Jul 23 13:24:19 knew kernel: ch0: Serial Number 3G22JJP38S46 > Jul 23 13:24:19 knew kernel: ch0: 20.000MB/s transfers (10.000MHz, offset 15, 16bit) > Jul 23 13:24:19 knew kernel: ch0: 25 slots, 1 drive, 1 picker, 1 portal > Jul 23 13:24:19 knew kernel: ch0: quirks=0x2<NO_DVCID> > > This is the same tape drive on another system: > > LSI Logic Ultra320 (LSI20320IE) SCSI PCI-E > > mpt0: <LSILogic 1030 Ultra4 Adapter> port 0x8000-0x80ff mem 0xfb220000-0xfb23ffff,0xfb200000-0xfb21ffff irq 19 at device 8.0 on pci15 > mpt0: MPI Version=1.2.14.0 > > Jul 28 16:36:31 varm kernel: sa0 at mpt0 bus 0 scbus14 target 1 lun 0 > Jul 28 16:36:31 varm kernel: sa0: <COMPAQ SuperDLT1 5F5F> Removable Sequential Access SCSI-2 device > Jul 28 16:36:31 varm kernel: sa0: Serial Number CXB46H0716 > Jul 28 16:36:31 varm kernel: sa0: 40.000MB/s transfers (40.000MHz DT, offset 6) > > Jul 28 16:37:03 varm kernel: ch0 at mpt0 bus 0 scbus14 target 3 lun 0 > Jul 28 16:37:03 varm kernel: ch0: <COMPAQ MSL5000 Series 0520> Removable Changer SCSI-2 device > Jul 28 16:37:03 varm kernel: ch0: Serial Number 3G22JJP38S46 > Jul 28 16:37:03 varm kernel: ch0: 3.300MB/s transfers > Jul 28 16:37:03 varm kernel: ch0: 25 slots, 1 drive, 1 picker, 1 portal > Jul 28 16:37:03 varm kernel: ch0: quirks=0x2<NO_DVCID> After rebooting this server, I see this in /var/run/dmesg. Why does it change? ch0 at mpt0 bus 0 scbus14 target 3 lun 0 ch0: <COMPAQ MSL5000 Series 0520> Removable Changer SCSI-2 device ch0: Serial Number 3G22JJP38S46 ch0: 20.000MB/s transfers (10.000MHz DT, offset 15, 16bit) ch0: 25 slots, 1 drive, 1 picker, 1 portal ch0: quirks=0x2<NO_DVCID> I was hoping to get more through put on this newer system with a different card. From what I see, my speed is only half of what it was. I'm using a PCI-E 3.0 X8 (in X16) slot. Have I missing something? — Dan Langille http://langille.org/
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