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[Kristina Hoeppner <1864760@xxxxxxxxxxxxxxxxxx>]

** Changed in: mahara
       Status: New => In Progress

** Changed in: mahara
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1864760

Title:
  Disk usage calculation is very slow with NFS

Status in Mahara:
  In Progress

Bug description:
  https://mahara.org/interaction/forum/topic.php?id=8585&offset=0&limit=10#post34233

  We experienced a very strange issue while upgrading from Mahara
  18.10.3 to 19.10.1. It was stuck at cron_site_data_daily() in the
  htdocs\lib\db\upgrade.php, taking forever to calculate disk usage and
  failing the upgrade process after 10 minutes. It was opening the
  database transaction and waiting forever for dirsize function to
  finish.

      if ($oldversion < 2019011500) {

          log_debug('run cron_site_data_daily function to update data
  with new chartjs structure');

          cron_site_data_daily();

      }

  The cron job call the same function and it is stuck for a very long
  time due to the same reasons.

  We believe this is an NFS file locking issue. The data root is mounted
  on an NFS volume,  and it is around 500 GB. Even the Linux du utility
  takes around 20 minutes to calculate the size of this NFS mount point.

  We fixed this issue by swapping the dirsize function
  (htdocs\lib\function.dirsize.php) with a custom function which
  utilizes disk_total_space and disk_free_space.

  function usqdirsize($path) {

      $disktotalspace = disk_total_space($path);

      $diskfreespace = disk_free_space($path);

      $diskusage = $disktotalspace - $diskfreespace;

      return $diskusage;

  }

  Question: do we need to calculate the size of a directory by iterating
  its contents? If not happy to commit this patch with a bug report.

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