DailyMaintainance/script.php Killing disks

[NickUK1]

I have been trying to run /usr/local/psa/bin/sw-engine-pleskrun /usr/local/psa/admin/plib/DailyMaintainance/script.php but it absolutely hammers my disks and they sit at 99% io (mostly writing) so I need to stop it as it basically makes my server grind to a halt.

I have enabled logging and it is at this point:

+ export PLESK_DEBUG_LEVEL=4
+ PLESK_DEBUG_LEVEL=4
+ /usr/local/psa/bin/sw-engine-pleskrun /usr/local/psa/admin/plib/DailyMaintainance/script.php
[Tue, 08 Jul 2014 00:30:25 +0100] > 0 Starting: Daily Maintainance
[Tue, 08 Jul 2014 00:30:25 +0100] > 0 == Begin Check for updates
[Tue, 08 Jul 2014 00:30:25 +0100] > 0 Last updates or upgrades check has been made at 2014-07-08T00:02:38+01:00
[Tue, 08 Jul 2014 00:30:25 +0100] > 0 == End Check for updates
[Tue, 08 Jul 2014 00:30:25 +0100] > 0 == Begin Installation of updates
[Tue, 08 Jul 2014 00:30:25 +0100] > 0 == End Installation of updates
[Tue, 08 Jul 2014 00:30:25 +0100] > 0 == Begin Update keys
[Tue, 08 Jul 2014 00:30:25 +0100] > 0 updating scheduled keys
[Tue, 08 Jul 2014 00:30:25 +0100] > 0 update resultCode=2 resultDesc=Key update disabled
[Tue, 08 Jul 2014 00:30:25 +0100] > 0 running kavnever workaround
[Tue, 08 Jul 2014 00:30:25 +0100] > 0 == End Update keys
[Tue, 08 Jul 2014 00:30:25 +0100] > 0 == Begin Collect Plesk usage statistics
[Tue, 08 Jul 2014 00:30:25 +0100] > 0 == End Collect Plesk usage statistics
[Tue, 08 Jul 2014 00:30:25 +0100] > 0 == Begin Process autoreports
[Tue, 08 Jul 2014 00:30:25 +0100] > 0 == End Process autoreports
[Tue, 08 Jul 2014 00:30:25 +0100] > 0 == Begin Sitebuilder management
[Tue, 08 Jul 2014 00:30:25 +0100] > 0 == End Sitebuilder management
[Tue, 08 Jul 2014 00:30:25 +0100] > 0 == Begin Mail boxes usage
[Tue, 08 Jul 2014 00:30:25 +0100] > 0 == End Mail boxes usage
[Tue, 08 Jul 2014 00:30:25 +0100] > 0 == Begin Execute statistics backend

Is there a way to make it play nicely?