Issue Dropbox Backup and High IO Load

[websavers]

Hi there,

At around 5am every morning we get reports about high load from those of our Plesk servers that have the Dropbox Backup plugin enabled and in use by our clients. The report from LFD indicates exactly what processes were running at the time. Processes like those to follow are present in each LFD `ps` report:

 root     15738  0.0  0.0  12260   400 ?        Ss   04:41   0:00 /usr/local/psa/admin/bin/event_handler -i -u psaadm /usr/local/psa/admin/bin/php -- -f /usr/local/psa/admin/plib/scripts/interface_async_executor.php -- EventListener /usr/local/psa/admin/plib/modules/dropbox-backup/library/EventListener.php handleEvent admin -#-#- -u psaadm /usr/local/psa/admin/bin/php -- -f /usr/local/psa/admin/plib/scripts/interface_async_executor.php -- EventListener /usr/local/psa/admin/plib/modules/git/library/EventListener.php handleEvent admin -#-#- -u psaadm /usr/local/psa/admin/bin/php -- -f /usr/local/psa/admin/plib/scripts/interface_async_executor.php -- EventListener /usr/local/psa/admin/plib/modules/letsencrypt/library/EventListener.php handleEvent admin -#-#- -u psaadm /usr/local/psa/admin/bin/php -- -f /usr/local/psa/admin/plib/scripts/interface_async_executor.php -- EventListener /usr/local/psa/admin/plib/modules/wp-toolkit/library/EventListener.php handleEvent admin -#-#- -u p saadm /u


 root     16023  0.0  0.0  12260   400 ?        Ss   04:41   0:00 /usr/local/psa/admin/bin/event_handler -i -u psaadm /usr/local/psa/admin/bin/php -- -f /usr/local/psa/admin/plib/scripts/interface_async_executor.php -- EventListener /usr/local/psa/admin/plib/modules/dropbox-backup/library/EventListener.php handleEvent admin -#-#- -u psaadm /usr/local/psa/admin/bin/php -- -f /usr/local/psa/admin/plib/scripts/interface_async_executor.php -- EventListener /usr/local/psa/admin/plib/modules/git/library/EventListener.php handleEvent admin -#-#- -u psaadm /usr/local/psa/admin/bin/php -- -f /usr/local/psa/admin/plib/scripts/interface_async_executor.php -- EventListener /usr/local/psa/admin/plib/modules/letsencrypt/library/EventListener.php handleEvent admin -#-#- -u psaadm /usr/local/psa/admin/bin/php -- -f /usr/local/psa/admin/plib/scripts/interface_async_executor.php -- EventListener /usr/local/psa/admin/plib/modules/wp-toolkit/library/EventListener.php handleEvent admin -#-#- -u psaadm /u

 root     16036  0.0  0.0  12260   400 ?        Ss   04:41   0:00 /usr/local/psa/admin/bin/event_handler -i -u psaadm /usr/local/psa/admin/bin/php -- -f /usr/local/psa/admin/plib/scripts/interface_async_executor.php -- EventListener /usr/local/psa/admin/plib/modules/dropbox-backup/library/EventListener.php handleEvent admin -#-#- -u psaadm /usr/local/psa/admin/bin/php -- -f /usr/local/psa/admin/plib/scripts/interface_async_executor.php -- EventListener /usr/local/psa/admin/plib/modules/git/library/EventListener.php handleEvent admin -#-#- -u psaadm /usr/local/psa/admin/bin/php -- -f /usr/local/psa/admin/plib/scripts/interface_async_executor.php -- EventListener /usr/local/psa/admin/plib/modules/letsencrypt/library/EventListener.php handleEvent admin -#-#- -u psaadm /usr/local/psa/admin/bin/php -- -f /usr/local/psa/admin/plib/scripts/interface_async_executor.php -- EventListener /usr/local/psa/admin/plib/modules/wp-toolkit/library/EventListener.php handleEvent admin -#-#- -u p

 root     16331  0.0  0.0  12260   400 ?        Ss   04:42   0:00 /usr/local/psa/admin/bin/event_handler -i -u psaadm /usr/local/psa/admin/bin/php -- -f /usr/local/psa/admin/plib/scripts/interface_async_executor.php -- EventListener /usr/local/psa/admin/plib/modules/dropbox-backup/library/EventListener.php handleEvent admin -#-#- -u psaadm /usr/local/psa/admin/bin/php -- -f /usr/local/psa/admin/plib/scripts/interface_async_executor.php -- EventListener /usr/local/psa/admin/plib/modules/git/library/EventListener.php handleEvent admin -#-#- -u psaadm /usr/local/psa/admin/bin/php -- -f /usr/local/psa/admin/plib/scripts/interface_async_executor.php -- EventListener /usr/local/psa/admin/plib/modules/letsencrypt/library/EventListener.php handleEvent admin -#-#- -u psaadm /usr/local/psa/admin/bin/php -- -f /usr/local/psa/admin/plib/scripts/interface_async_executor.php -- EventListener /usr/local/psa/admin/plib/modules/wp-toolkit/library/EventListener.php handleEvent admin -#-#- -u psaadm /u

 root     16483  0.0  0.0  12260   400 ?        Ss   04:42   0:00 /usr/local/psa/admin/bin/event_handler -i -u psaadm /usr/local/psa/admin/bin/php -- -f /usr/local/psa/admin/plib/scripts/interface_async_executor.php -- EventListener /usr/local/psa/admin/plib/modules/dropbox-backup/library/EventListener.php handleEvent admin -#-#- -u psaadm /usr/local/psa/admin/bin/php -- -f /usr/local/psa/admin/plib/scripts/interface_async_executor.php -- EventListener /usr/local/psa/admin/plib/modules/git/library/EventListener.php handleEvent admin -#-#- -u psaadm /usr/local/psa/admin/bin/php -- -f /usr/local/psa/admin/plib/scripts/interface_async_executor.php -- EventListener /usr/local/psa/admin/plib/modules/letsencrypt/library/EventListener.php handleEvent admin -#-#- -u psaadm /usr/local/psa/admin/bin/php -- -f /usr/local/psa/admin/plib/scripts/interface_async_executor.php -- EventListener /usr/local/psa/admin/plib/modules/wp-toolkit/library/EventListener.php handleEvent admin -#-#- -u p

I've stripped out dozens more of these processes which are running at the time because of the 1000 char limit for posts.

It would be great if we could either have the dropbox backup system obey the same settings as the normal Plesk backup (ie: max number of simultaneous processes) or if we could configure it separately to set:

- Max processes
- ionice
- nice

So as to limit the impact the Dropbox backup system has on the rest of the server. Even better, it'd be great if the ionice and nice values could be automatically set to low priority (as that does make sense for a backup system) -- it doesn't need to be configurable.

Any suggestions as to how I can mitigate this problem?