Any part after “–url” should be alright. You should still be able to use " > /dev/null" if you want. It might take a bit longer because you have three archiver running. This should be no problem if your server can handle this but if not it will slow down everything. So maybe start only one as you said. It probably also takes longer because it didn’t run in the last days and it has to catch up.
Thanks, so i will use one of them and rest gets thrown out 
Piwik is working again… yaaay 
The patch from michael-t-weber also fixed my issue which was the same as described in this thread. Thanks!!