Re: [BackupPC-users] parity on archive files
Krsnendu dasa wrote: 1. What is parity? What are the parity files for and How do you use them with the archives? See http://en.wikipedia.org/wiki/Parchive. Basically if one of the archive files has some corruption, and it's not too much, then the parity files will allow you to recover from that corruption. The percentage you choose depends on how much you trust your media. 2. I chose bZ2 for my backup, to minimize disk usage. The archiving took 680mins to backup. If I chose gzip instead how much difference would there be? How much bigger would the archive be and how much faster would it be. I am planning to do quite a few backups to DVD in future, so I thought now would be the time to ask. gzip is a lot faster, but is only an extra small percentage larger (maybe 5% or so). It all depends on your data to how compressible it is (e.g. jpegs will compress to about the same size with bzip2 or gzip) so try a gzip archive and see how it compares. - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/backuppc-users http://backuppc.sourceforge.net/
[BackupPC-users] parity on archive files
I just did my first archive. I split the archives into 4482MB files (which is the capacity of a DVD in MB from what I can figure out.) I also set the parity to 5%. As you can see below 7 archive files were created and 8 parity files. The documentation is a bit thin in the archive section so I have a few questions. 1. What is parity? What are the parity files for and How do you use them with the archives? 2. I chose bZ2 for my backup, to minimize disk usage. The archiving took 680mins to backup. If I chose gzip instead how much difference would there be? How much bigger would the archive be and how much faster would it be. I am planning to do quite a few backups to DVD in future, so I thought now would be the time to ask. ls -alh of the DVD backup directory: drwxr-x--- 2 BackupPC BackupPC 4.0K Apr 14 22:28 . drwxr-xr-x 16 BackupPC BackupPC 4.0K Apr 14 13:18 .. -rw-r- 1 BackupPC BackupPC 4.2G Apr 14 14:28 localhost.101.tar.bz2.aa -rw-r- 1 BackupPC BackupPC 4.2G Apr 14 16:16 localhost.101.tar.bz2.ab -rw-r- 1 BackupPC BackupPC 4.2G Apr 14 17:39 localhost.101.tar.bz2.ac -rw-r- 1 BackupPC BackupPC 4.2G Apr 14 18:54 localhost.101.tar.bz2.ad -rw-r- 1 BackupPC BackupPC 4.2G Apr 14 20:04 localhost.101.tar.bz2.ae -rw-r- 1 BackupPC BackupPC 4.2G Apr 14 21:14 localhost.101.tar.bz2.af -rw-r- 1 BackupPC BackupPC 2.1G Apr 14 22:13 localhost.101.tar.bz2.ag -rw-r- 1 BackupPC BackupPC 41K Apr 15 00:41 localhost.101.tar.bz2.par2 -rw-r- 1 BackupPC BackupPC 14M Apr 15 00:41 localhost.101.tar.bz2.vol000+01.par2 -rw-r- 1 BackupPC BackupPC 28M Apr 15 00:41 localhost.101.tar.bz2.vol001+02.par2 -rw-r- 1 BackupPC BackupPC 56M Apr 15 00:41 localhost.101.tar.bz2.vol003+04.par2 -rw-r- 1 BackupPC BackupPC 112M Apr 15 00:41 localhost.101.tar.bz2.vol007+08.par2 -rw-r- 1 BackupPC BackupPC 223M Apr 15 00:41 localhost.101.tar.bz2.vol015+16.par2 -rw-r- 1 BackupPC BackupPC 445M Apr 15 00:41 localhost.101.tar.bz2.vol031+32.par2 -rw-r- 1 BackupPC BackupPC 515M Apr 15 00:41 localhost.101.tar.bz2.vol063+37.par2 - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ BackupPC-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/backuppc-users http://backuppc.sourceforge.net/
