AACRAID not exposing drives in Protect mode

[Nathanial Marsh]

In 18.04 LTS - Drives behind an array were exposed as /dev/sg[12345...] when expose_externals was set to -1(default)
In 20.04 LTS - This is no longer happening unless you force expose_externals to 1. This is undesirable as it also exposes the disks as /dev/sd[abc] as well as /dev/sg[123]

No hardware/firmware/bios changes between 18.04 and 20.04.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1924957

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Guilherme G. Piccoli (gpiccoli)]

Hi, thanks for the bug report. Can you please try in 18.04 with both kernels 4.15 and 5.4? The 4.15 series is the GA series for Ubuntu 18.04, meaning it is the kernel version available since the release of 18.04. Now, through HWE process[0] we get more recent kernels to older releases, so kernel 5.4 is available to Bionic - which is the version on Ubuntu 20.04.

With that experiment, we could narrow it down to a kernel change vs. userspace.
Thanks in advance,

Guilherme

[0] https://wiki.ubuntu.com/Kernel/LTSEnablementStack