Disk definition order

AmigaOne X5000 platform specific issues related to Linux only.
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Roland
Posts: 442
Joined: Tue May 02, 2017 7:23 am

Disk definition order

Post by Roland »

While testing a SCSI controller with Ubuntu 16.04, I noticed some strange things concerning disk definition order...

Examples of different disk compositions  and their 'sdx' definitions after booting:

1)
Sata HD -> sda
USB disk -> sdb

2)
SCSI HD -> sda
USB disk -> sdb
Sata HD -> sdc

3)
SCSI CD-ROM (no sdx definition given)
USB disk -> sda
Sata HD -> sdb

So, what is the logic in these results...? Why adding a SCSI disk (even when there is no sdx definition given to it) seems to reverse the defintion order of Sata and an USB disks? This is not just a curiosity because if the sdx definition of your boot disk changes you get Kernel panics and have to change Bootargs...

( I do not dare even guess what might happen if also an additional Sata controller would be present! ;) )
- Roland -

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