2011/11/14 Scott Ribe <scott_ribe@xxxxxxxxxxxxxxxx>: > On Nov 14, 2011, at 10:59 AM, Jean-Armel Luce wrote: > >> just for the value : rsync --checksum is the option to use to prevent >> copying of identical files > > No, that's not what it's used for. It already avoids sending identical blocks by using checksums. --checksum forces a checksum on files that have identical sizes & mod times, thus catching files that have different contents despite having the same mod times & sizes. no, you are wrong. -c, --checksum "This changes the way rsync checks if the files have been changed and are in need of a transfer. Without this option, rsync uses a "quick check" that (by default) checks if each file's size and time of last modification match between the sender and receiver. This option changes this to compare a 128-bit checksum for each file that has a matching size. Generating the checksums means that both sides will expend a lot of disk I/O reading all the data in the files in the transfer (and this is prior to any reading that will be done to transfer changed files), so this can slow things down significantly. " ... -- Cédric Villemain +33 (0)6 20 30 22 52 http://2ndQuadrant.fr/ PostgreSQL: Support 24x7 - Développement, Expertise et Formation -- Sent via pgsql-admin mailing list (pgsql-admin@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-admin
