Public bug reported:
Ubuntu's current kernel option
CONFIG_MD_AUTODETECT=y
enables the kernel's RAID autodetection during boot.
Aside from causing a delay for everyone this often also disturbs the udev/mdadm
setup of raid devices in the system.
(i.e. devices partly busy/set up without an entry in the mapfile used by mdadm
--incremental)
Here is what README.initrams from mdadm tarball says about the kernel's
raid autodetection feature:
"while useful, [they] do not provide complete functionality
and are unlikely to be extended. The preferred way to assemble md
arrays at boot time is using 'mdadm' "
Ubuntu does this using udev rules in initramfs as well as later on.
The kernel's raid autodetection should therefore be disabled in ubuntu
kernels.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Affects: mdadm (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Description changed:
- Binary package hint: mdadm
-
- Ubutus current kernel option
+ Ubuntu's current kernel option
CONFIG_MD_AUTODETECT=y
enables the kernel's RAID autodetection during boot.
Aside from causing a delay for everyone this often also disturbs the
udev/mdadm setup of raid devices in the system.
(i.e. devices partly busy/set up without an entry in the mapfile used by
mdadm --incremental)
Here is what README.initrams from mdadm tarball says about the kernel's
raid autodetection feature:
"while useful, [they] do not provide complete functionality
and are unlikely to be extended. The preferred way to assemble md
arrays at boot time is using 'mdadm' "
Ubuntu does this using udev rules in initramfs as well as later on.
The kernel's raid autodetection should therefore be disabled in ubuntu
kernels.
--
enabled kernel raid autodetection disturbs udev/mdadm (initramfs & later)
https://bugs.launchpad.net/bugs/551719
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