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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? –  Alien11689 Feb 7 '13 at 7:53
    
I've tried to rescan scsi but this won't work. –  Lewy Feb 7 '13 at 8:02
3  
Is SCSI HBA driver loaded? Please post dmesg from both OSs. –  sendmoreinfo Mar 22 '13 at 11:01
    
It looks like the be2 scsi driver is not loaded on CentOS. –  Baruch Even Dec 2 '13 at 22:28
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