I have a backup script that:

1. compress some files
2. generate md5
3. copy the compressed file to another server.
4. the other server finishes comparing MD5 (to find copy errors).

Here it's the core script:

nice -n 15 tar -czvf $BKP $PATH_BKP/*.* \
| xargs -I '{}' sh -c "test -f '{}' && md5sum '{}'" \
| tee $MD5
scp -l 80000 $BKP $SCP_BKP
scp $MD5 $SCP_BKP

This routine got CPU at 90% at gzip routine, slowing down the production server. I tried to add a nice -n 15 but server still hangs.

I've already read 1 but the conversation didn't help me.

What is the best approach to solve this issue ? I am open to new architectures/solutions :)