group.of.nepali.translators team mailing list archive

[Dimitri John Ledkov <launchpad@xxxxxxxxxxxx>]

Public bug reported:

[Impact]

 * In xenial, mdadm-waitclean is an init.d script, and it appears that
it doesn't not run late enough. In later releases a systemd-shutdown
script is shipped instead. Which results in wait-clean action executed
later in the shutdown cycle, having more chances to complete the
shutdown with clean/synced RAID array state.

 * In xenial, there is no default shutdown initramfs, and therefore
mdmon processes are killed before the Intel Matrix RAID / DFF external
metadata RAID arrays are stopped. This leads to a full resync upon next
assembly. One options is to implement a shutdown initramfs, another
solution is to not takeover mdmon process from the initramfs. This will
result in holding up initramfs memory throughout the lifetime of the
system, however the net effect should be clean raid array shutdowns
which will mitigate excessive resyncs.


[Bugfix]
Backport mdadm.shutdown systemd-shutdown script to xenial

[Test Case]

 * Switch logging to console, and make it verbose LogLevel=debug LogTarget=console. Perform shutdown and observe that mdadm.shutdown is executed during shutdown.
 * Check that the system boots with a clean raid-array state.

[Regression Potential]

 * On systems that have rootfs on the Intel Matrix / DDF raid (external metadata mdadm raid, i.e. NOT the generic linux raid) initramfs will result in being held up through the lifetime of the boot thus using more steady state RAM. This only affects systems that use Intel Matrix / DDF controllers, and are typically bare-metal servers.
 * additional wait-clean shutdown script is quick but has an impact on shutdown.target speed / time to shutdown or reboot.

[Other Info]
 
 * Later releases do not use sysv-init script thus this not a direct backport of code from later releases

** Affects: mdadm (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: mdadm (Ubuntu Xenial)
     Importance: Undecided
         Status: New

** Also affects: mdadm (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1722491

Title:
  improve mdadm imsm integration with systemd

Status in mdadm package in Ubuntu:
  New
Status in mdadm source package in Xenial:
  New

Bug description:
  [Impact]

   * In xenial, mdadm-waitclean is an init.d script, and it appears that
  it doesn't not run late enough. In later releases a systemd-shutdown
  script is shipped instead. Which results in wait-clean action executed
  later in the shutdown cycle, having more chances to complete the
  shutdown with clean/synced RAID array state.

   * In xenial, there is no default shutdown initramfs, and therefore
  mdmon processes are killed before the Intel Matrix RAID / DFF external
  metadata RAID arrays are stopped. This leads to a full resync upon
  next assembly. One options is to implement a shutdown initramfs,
  another solution is to not takeover mdmon process from the initramfs.
  This will result in holding up initramfs memory throughout the
  lifetime of the system, however the net effect should be clean raid
  array shutdowns which will mitigate excessive resyncs.

  
  [Bugfix]
  Backport mdadm.shutdown systemd-shutdown script to xenial

  [Test Case]

   * Switch logging to console, and make it verbose LogLevel=debug LogTarget=console. Perform shutdown and observe that mdadm.shutdown is executed during shutdown.
   * Check that the system boots with a clean raid-array state.

  [Regression Potential]

   * On systems that have rootfs on the Intel Matrix / DDF raid (external metadata mdadm raid, i.e. NOT the generic linux raid) initramfs will result in being held up through the lifetime of the boot thus using more steady state RAM. This only affects systems that use Intel Matrix / DDF controllers, and are typically bare-metal servers.
   * additional wait-clean shutdown script is quick but has an impact on shutdown.target speed / time to shutdown or reboot.

  [Other Info]
   
   * Later releases do not use sysv-init script thus this not a direct backport of code from later releases

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