compress

compresscmd xz

compressoptions -9

---------------

 compress manually:

--verbose  show progress

 To reduce system load:

/etc/cron.daily/logrotate from:

    /usr/sbin/logrotate /etc/logrotate.conf

to:

    nice -n 19 ionice -c3 /usr/sbin/logrotate /etc/logrotate.conf

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=652600