There are a number of complications involved in using ionice in this context. If you look at what some of the existing cron jobs that use this are doing, that's quite a complicated business that I'd rather not get involved in. It would be nice if this could all be wrapped into some script ionice-if-usable for use by cron jobs and such. But until then, I don't see much benefit into adding this maintenance overhead, especially since the relevant cron jobs are already making use of ionice themselves anyway.
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