Hello, My question is regarding the interpretation of --stats output and whether I have a performance issue or not. Can the client/server architecture (rsync client on one machine, rsync server on another machine) be far slowlier than a local rsync session ? This is the ouput of an rsync session: date rsync -v --recursive --links --perms --times --group --owner --xattrs --acls --delete --stats --human-readable \ --link-dest=/storage/daily/home/d1 \ serveur3::home /storage/daily/home/d0 date sam. juin 9 07:10:19 CEST 2012 receiving incremental file list ./ aquota.group aquota.user accueil/COURRIER/RETOUR DOC. ORIGINAUX .doc accueil/COURRIER/demande liste papiers rue du march?.doc accueil/COURRIER/demande par courrier MME.doc accueil/COURRIER/plusieurs dem. par t?l..doc accueil/Document Logement/R?pertoire GT.xls accueil/Logements Vacants/Logements vacants 2010/LOGEMENTS VACANTS 2010 JUIL ? DEC.xls accueil/Logements Vacants/Logements vacants 2010/Logements vacants CA 2010.xls accueil/ilot gambetta/ACCORLO SAINT AUBIN LA POSTE SANS GT.doc commercial/contentieux/PORTE VUE LOGEMENTS/PARC SAINT CYR/013 Parc Saint Cyr - Les Cyclamens.xls commercial/contentieux/PORTE VUE LOGEMENTS/PARC SAINT CYR/013 Parc Saint Cyr - Les G?raniums.xls commercial/contentieux/PORTE VUE LOGEMENTS/PARC SAINT CYR/013 Parc Saint Cyr - Oasis.xls kavupdater/ kavupdater/retranslator/retranslator.log profiles/clambany/Application Data/Microsoft/CryptnetUrlCache/Content/7B2238AACCEDC3F1FFE8E7EB5F575EC9 profiles/clambany/Application Data/Microsoft/CryptnetUrlCache/MetaData/7B2238AACCEDC3F1FFE8E7EB5F575EC9 sahlm/Formation EXCEL.xls technique/5D666000 technique/EDL 2011.xls technique/SINISTRES 2010 2011/T DOSSIERS SINISTRES DE 02 ? 2011/TABL SINI 2010 goupil.xls technique/a.Cl?ment/SUIVI DES DEVIS 2010.xls technique/a.Cl?ment/SUIVI DES DEVIS 2011.xls technique/a.Cl?ment/SUIVI DES DEVIS 2012.xls technique/a.Teddy/EDL/EDL 2008.xls Number of files: 1117407 Number of files transferred: 5 Total file size: 202.86G bytes Total transferred file size: 20.67K bytes Literal data: 1.67K bytes Matched data: 19.00K bytes File list size: 30.32M File list generation time: 0.099 seconds File list transfer time: 0.000 seconds Total bytes sent: 114.17K Total bytes received: 30.69M sent 114.17K bytes received 30.69M bytes 43.23K bytes/sec total size is 202.86G speedup is 6586.34 sam. juin 9 07:22:11 CEST 2012 THIS IS ROUGHLY 1600 FILES / SECOND PROCESSED ********************************************* The server is a fast machine with SCSI disks, connected through a 1Gbs link to the client. The client is a new dedicated backup machine with standard dedicated SATA disks # hdparm -t /dev/sdc /dev/sdc: Timing buffered disk reads: 446 MB in 3.01 seconds = 148.31 MB/sec CPU stats during a rsync session: on the client (top), rsync two processes are usually on top load average 0.11 0.31 0.36 rsync process consumes between 1-50% CPU I did some other test without --dest-link option date rsync --recursive --links --perms --times --group --owner --xattrs --acls --delete --stats --human-readable \ serveur3::home /storage/monthly/home date Run 1 (destination directory was empty): ***************** sam. juin 9 07:34:08 CEST 2012 Number of files: 1117487 Number of files transferred: 1003718 Total file size: 207.09G bytes Total transferred file size: 207.09G bytes Literal data: 207.09G bytes Matched data: 0 bytes File list size: 30.32M File list generation time: 0.695 seconds File list transfer time: 0.000 seconds Total bytes sent: 19.76M Total bytes received: 207.19G sent 19.76M bytes received 207.19G bytes 29.34M bytes/sec total size is 207.09G speedup is 1.00 sam. juin 9 09:31:50 CEST 2012 Load average was 0.17 0.19 0.26 Run 2: ***************** sam. juin 9 10:14:25 CEST 2012 Number of files: 1117487 Number of files transferred: 21 Total file size: 207.09G bytes Total transferred file size: 4.14G bytes Literal data: 124.38M bytes Matched data: 4.01G bytes File list size: 30.32M File list generation time: 0.054 seconds File list transfer time: 0.000 seconds Total bytes sent: 1.51M Total bytes received: 155.86M sent 1.51M bytes received 155.86M bytes 390.99K bytes/sec total size is 207.09G speedup is 1315.90 sam. juin 9 10:21:07 CEST 2012 THIS IS ROUGHLY 2700 FILES / SECOND PROCESSED ********************************************* I did a third test on my home machine which is using rsync for backup on a *locally attached USB disk* (sdc): rsync options: '-a --delete --delete-excluded --one-file-system --stats --human-readable' # hdparm -t /dev/sdc1 /dev/sdc1: Timing buffered disk reads: 70 MB in 3.02 seconds = 23.17 MB/sec dim. juin 10 08:52:55 CEST 2012 Number of files: 107883 Number of files transferred: 0 Total file size: 564.75G bytes Total transferred file size: 0 bytes Literal data: 0 bytes Matched data: 0 bytes File list size: 2.40M File list generation time: 0.001 seconds File list transfer time: 0.000 seconds Total bytes sent: 2.40M Total bytes received: 2.27K sent 2.40M bytes received 2.27K bytes 177.86K bytes/sec total size is 564.75G speedup is 235206.08 dim. juin 10 08:53:08 CEST 2012 THIS IS ROUGHLY 107000 FILES / SECOND PROCESSED *********************************************** 40 TIMES FASTER !!!! Thanks a lot for your kind advise