I'm using tar to archive a bunch of files to LTO-7 tape. Generally each file is about 1-2GB, and there can be several hundred of them in each archive (up to ~1TB per archive).At the moment, I'm archiving using:tar -cvf /dev/nst0 --totals --warning=no-file-changed $OLDEST_DIRThis is getting me about 90MBps from a disk that should be capable of about three times that (and the tape should be capable of 2-3 times that). Looking closely, it seems like I'm CPU-bound since tar is taking 100% of one CPU.This is particularly annoying since I'm trying to verify if the archive is the right size by first doing this tar -cP --warning=no-file-changed $OLDEST_DIR | wc -c... and then comparing the sizes of the archives produced.So, is there any quicker way? 
Faster (uncompressed) archiving tool than tar?
backup;tar;archive;large files;tape