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On ubuntu 12.10 I have those SCSI drives:

[1:0:0:0] cd/dvd TSSTcorp CDDVDW TS-H653N 0208 /dev/sr0 [2:0:0:0] disk Generic USB SD Reader 1.00 /dev/sdb [2:0:0:1] disk Generic USB CF Reader 1.01 /dev/sdc [2:0:0:2] disk Generic USB SM Reader 1.02 /dev/sdd [2:0:0:3] disk Generic USB MS Reader 1.03 /dev/sde [3:0:0:0] mediumx HP C7200 162D /dev/sch0 [3:0:1:0] tape HP Ultrium 1-SCSI E24V /dev/st0

On centOS 5.9 I have those SCSI drives:

[0:0:0:0] disk ATA Hitachi HDT72503 V54O /dev/sda [1:0:0:0] cd/dvd TSSTcorp CDDVDW TS-H653N 0208 /dev/sr0 [2:0:0:0] disk Generic USB SD Reader 1.00 /dev/sdb [2:0:0:1] disk Generic USB CF Reader 1.01 /dev/sdc [2:0:0:2] disk Generic USB SM Reader 1.02 /dev/sdd [2:0:0:3] disk Generic USB MS Reader 1.03 /dev/sde

Loaded kernel modules on ubuntu.
Loaded kernel modules on centos.
This is the same machine, with same adapter, but with different operating systems.

In both situations st kernel module is loaded, but in centos I don't have my tape library in lsscsi and in /dev/st0.

What might be the cause that this won't work on centOS ?

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  • Did you try to rescan scsi? Commented Feb 7, 2013 at 7:53
  • I've tried to rescan scsi but this won't work. Commented Feb 7, 2013 at 8:02
  • 3
    Is SCSI HBA driver loaded? Please post dmesg from both OSs. Commented Mar 22, 2013 at 11:01
  • It looks like the be2 scsi driver is not loaded on CentOS. Commented Dec 2, 2013 at 22:28

2 Answers 2

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The lsscsi output shows (in the first column) that the tape library (it's not just a drive, but a library with a robotic arm & drive) is on a different SCSI bus than your other devices; so you're missing a module...

Your loaded modules show a LOT of iSCSI modules on the ubuntu(working) side, so if you look at lsscsi -H on the working system, you'll see what controller #3 is, and you can replicate it on centos.

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I don't think that it is your case, but i was having a problem with a TL4000 on Ubuntu 16.04. The autoloader was showing when using lsscsi -g but suddenly disappeared.

I just found out that, on the Library Type configuration on the TL are two options: Random and Sequential. I've changed it to sequential, thinking that it was going to force the Library to use the tapes in the numbered order.

This option make the changer disappear on the server. I tested change this option back and forth and everytime it is on Sequential the changer disappear.

Also, on drive configuration on the Library, is a option to set the Control path. When you have two or more drives, you have to choose on of the drives to be the Control path.

My lsscsi output now looks like this:

$ lsscsi -g [0:0:0:0] cd/dvd HL-DT-ST CDRW/DVD GCC4244 B101 /dev/sr0 /dev/sg0 [4:0:8:0] enclosu DP BACKPLANE 1.05 - /dev/sg1 [4:2:0:0] disk DELL PERC 5/i 1.03 /dev/sda /dev/sg2 [5:0:0:0] disk DELL MD36xxf 0784 /dev/sdb /dev/sg3 [5:0:0:31] disk DELL Universal Xport 0784 - /dev/sg4 [5:0:1:0] tape IBM ULT3580-HH5 H971 /dev/st0 /dev/sg5 [5:0:1:1] mediumx IBM 3573-TL E.70 /dev/sch0 /dev/sg7 [5:0:2:0] tape IBM ULT3580-HH5 H971 /dev/st1 /dev/sg6
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