dmesg output not as expected

[Dan Langille]

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>

Thank you.

— 
Dan Langille
http://langille.org/