rsync compress

【基本介绍】
我们用rsync做跨网络传输的时候，经常是先压缩文件然后在传输，如果我们在rsync的时候还用压缩参数的话就会增加CPU的负担

【参数介绍】
-z, --compress: compress file data during the transfer
Rsync can compress the data that are transferred to reduce network activity. The destination file will be the same as the original. Use it for remote transfers when synching files which are uncompressed and will have a large compression ratio (eg: large text files, CD images or raw partition images). This option is not efficient on files which are already compressed: zip, gz, bz2, taz, jpeg, pdf, ... This will cause a significant increase in the CPU usage on both sourcing and destination systems.

所以我们不需要添加-z


【参考】
http://www.sysresccd.org/Sysresccd-manual-en_Backup_and_transfer_your_data_using_rsync