Hi all, I do some testings on rsync by using the following method:
1- rsyning the following file with rsync: rsync rsync://ftp.cn.debian.org/debian/dists/Debian7.8/main/binary-all/ Packages.bz2 . 2- Then I split the file into little files with the file size equaling to 128K, which is the maximum of the block-size accepted by rsync. split -b 128K Packages.bz2 And at this point, I obtained the following 20 files: werner@debian:~/http_resume_test$ ls x* xaa xac xae xag xai xak xam xao xaq xas xab xad xaf xah xaj xal xan xap xar xat Then I delete the some files, say, xab and xae, from the above little files, and then use the cat tool to regenerate the Packages.bz2 by only using the remaining little files: werner@debian:~/http_resume_test$ for i in `ls x*`; do cat $i >> Packages.bz2; done 3- Then, I re-run rsync with the following commands to syncing on the above re-generated Packages.bz2 file for testing: $ rsync -v -B131072 --append rsync://ftp.cn.debian.org/debian/dists/ Debian7.8/main/binary-all/Packages.bz2 . [snip] Packages.bz2 sent 47 bytes received 577,028 bytes 230,830.00 bytes/sec total size is 2,541,616 speedup is 4.40 $ rsync -v -B131072 --append-verify rsync://ftp.cn.debian.org/debian/ dists/Debian7.8/main/binary-all/Packages.bz2 . [snip] sent 28 bytes received 1,381 bytes 563.60 bytes/sec total size is 2,541,616 speedup is 1,803.84 4- Finally, I use diff to see the differences between the original Packages.bz2 file the the one generated by the above two rsyncing runnings with --append and --append-verify options. Note, in the following command, the ~/Packages.bz2 is the original Packages.bz2 file directly obtained from http://ftp.cn.debian.org/debian/ dists/Debian7.8/main/binary-all/Packages.bz2. werner@debian:~/http_resume_test$ diff Packages.bz2 ~/Packages.bz2 Binary files Packages.bz2 and /home/werner/Packages.bz2 differ As you can see, the finally file obtained by --append then --append- verify is a wrong file which is differ from the original one. 5- In the above test, if I only the running the following command to re- rsyncing on the re-gererated Packages.bz2: $ rsync -v -B131072 --append-verify rsync://ftp.cn.debian.org/debian/ dists/Debian7.8/main/binary-all/Packages.bz2 . The result file will be correct, see following for detail: werner@debian:~/http_resume_test$ diff Packages.bz2 ~/Packages.bz2 werner@debian:~/http_resume_test$ Any hints on this issue? Regards -- .: Hongyi Zhao [ hongyi.zhao AT gmail.com ] Free as in Freedom :. -- Please use reply-all for most replies to avoid omitting the mailing list. To unsubscribe or change options: https://lists.samba.org/mailman/listinfo/rsync Before posting, read: http://www.catb.org/~esr/faqs/smart-questions.html