**Question** 

**Not detecting all physical devices behind Smart Array controller after upgrading to Debian 8 Jessie**

**HP P212 Smart Array Controller and HP 1/8 G2 LTO-5 3000 SAS Autoloader**

*Debian 7 Whezzy kernel 3.2.0-4-amd64:*

```
# lsscsi -g
[0:0:0:0]    disk    ATA      WDC WD5003ABYX-0 01.0  /dev/sda   /dev/sg0 
[0:0:1:0]    disk    ATA      ST3000DM001-9YN1 CC4B  /dev/sdb   /dev/sg1 
[1:0:0:0]    disk    ATA      WDC WD30EFRX-68E 80.0  /dev/sdc   /dev/sg2 
[4:0:0:0]    storage HP       P212             5.14  -          /dev/sg3 
[4:2:0:0]    tape    HP       Ultrium 5-SCSI   Z58W  /dev/st0   /dev/sg4  <<= physical device (tape)
[4:2:0:1]    mediumx HP       1x8 G2 AUTOLDR   3.50  /dev/sch0  /dev/sg5 <<= physical device (changer), missing in Debian 8

```

*Debian 8 Jessie kernel 3.16.0-4-amd64:*

```
# lsscsi -g
[0:0:0:0]    disk    ATA      WDC WD5003ABYX-0 01.0  /dev/sda   /dev/sg0 
[0:0:1:0]    disk    ATA      ST3000DM001-9YN1 CC4B  /dev/sdb   /dev/sg1 
[1:0:0:0]    disk    ATA      WDC WD30EFRX-68E 80.0  /dev/sdc   /dev/sg2 
[4:0:0:0]    storage HP       P212             5.14  -          /dev/sg3 
[4:2:0:0]    tape    HP       Ultrium 5-SCSI   Z58W  /dev/st0   /dev/sg4 

```

* Missing devices are not detected even after a scsi bus rescan.
* Tape changer missing after moving to Debian 8.