[Bug 1916019] [NEW] speed of execution of reshape and chunk.

[geole0]

Public bug reported:

Hello
speed of execution of reshape and chunk under Ubuntu version 20.04.2.

The execution speed of the "reshape" and "chunk" actions of the MDADM
command is much too slow :(speed = 288K / sec).

The IOTOP command also indicates that the flow is very low.
There is nothing visible with the journalctl command.
It will take more than six hours to process a raid of 30 GB.

So probably a month if the raid is 4 TB!
In addition these commands have no effect
sudo sysctl -w dev.raid.speed_limit_min=50000 && sudo sysctl -w dev.raid.speed_limit_max=500000 && cat /proc/sys/dev/raid/speed_limit*
500000
50000

The problem is also visible in this french discussion: https://forum
.ubuntu-fr.org/viewtopic.php?pid=22416407#p22416407

Please provide a solution.

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

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to mdadm in Ubuntu.
https://bugs.launchpad.net/bugs/1916019

Title:
  speed of execution of reshape and chunk.

Status in mdadm package in Ubuntu:
  New

Bug description:
  Hello
  speed of execution of reshape and chunk under Ubuntu version 20.04.2.

  The execution speed of the "reshape" and "chunk" actions of the MDADM
  command is much too slow :(speed = 288K / sec).

  The IOTOP command also indicates that the flow is very low.
  There is nothing visible with the journalctl command.
  It will take more than six hours to process a raid of 30 GB.

  So probably a month if the raid is 4 TB!
  In addition these commands have no effect
  sudo sysctl -w dev.raid.speed_limit_min=50000 && sudo sysctl -w dev.raid.speed_limit_max=500000 && cat /proc/sys/dev/raid/speed_limit*
  500000
  50000

  The problem is also visible in this french discussion: https://forum
  .ubuntu-fr.org/viewtopic.php?pid=22416407#p22416407

  Please provide a solution.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/mdadm/+bug/1916019/+subscriptions