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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:
>=20
> 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'.
>=20
> 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?
>=20
> Similarly, ch0 goes from 20MB/s to 3.3MB/s....=20
>=20
> I was hoping for a speed boost.  :)
>=20
> Some of the camcontrol devlist output includes:
>=20
> <COMPAQ SuperDLT1 5F5F>            at scbus14 target 1 lun 0 =
(pass11,sa0)
> <COMPAQ MSL5000 Series 0520>       at scbus14 target 3 lun 0 =
(pass12,ch0)
>=20
> This is on the existing system:
>=20
> I *think* this system holds a Symbios Ultra2 32-bit PCI SCSI Adapter =
SYM8951U
>=20
> 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
>=20
> 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=20
> Jul 23 13:24:19 knew kernel: sa0: Serial Number CXB46H0716 =20
> Jul 23 13:24:19 knew kernel: sa0: 80.000MB/s transfers (40.000MHz, =
offset 31, 16bit)
>=20
> 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=20
> 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=3D0x2<NO_DVCID>
>=20
> This is the same tape drive on another system:
>=20
> LSI Logic Ultra320 (LSI20320IE) SCSI PCI-E
>=20
> mpt0: <LSILogic 1030 Ultra4 Adapter> port 0x8000-0x80ff mem =
0xfb220000-0xfb23ffff,0xfb200000-0xfb21ffff irq 19 at device 8.0 on =
pci15
> mpt0: MPI Version=3D1.2.14.0
>=20
> 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 =20
> Jul 28 16:36:31 varm kernel: sa0: 40.000MB/s transfers (40.000MHz DT, =
offset 6)
>=20
> 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=3D0x2<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=3D0x2<NO_DVCID>

I was hoping to get more through put on this newer system with a =
different card.  =46rom 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?

=E2=80=94=20
Dan Langille
http://langille.org/








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