On 30/05/13 18:13, Nicola Scattolin wrote: > Il 30/05/2013 10:04, Adam Goryachev ha scritto: >> On 30/05/13 16:57, Nicola Scattolin wrote: >>> hi, >>> i have a problem in full backups of a 2TB disk. >>> when backuppc do fullbackup it takes on average 1866.0 minutes while the >>> incremental backup takes around 20 minutes. >>> do you think there is something wrong or it's just for the amount of >>> data to be backupd? >> Most likely this is a limitation of bandwidth, CPU, or memory on either >> the backuppc server, or the machine being backed up. >> >> Have you enabled checksum-seed in your config? >> Are you even using rsync? >> >> Remember a full backup will read the full content of every file (talking >> about rsync because I will assume that is what you are using) on both >> the client and backuppc server. A incremental only looks at file >> attributes such as size and timestamp. >> >> Can you be more detailed about your configuration, and during a full >> backup look at memory utilisation on both backuppc server and the client. >> >> PS, this question is asked regularly, so you should also look at the >> archives to see the previous discussions (which have been very detailed, >> and sometimes heated). >> >> Regards, >> Adam >> > i use smb to transfer file, and there are not be cpu or bandwidth > limitation, it's a local server. > where is the checksum-seed option? i can't find it
OK, so this is even more obvious. An incremental will only look at the timestamp, and transfer all files newer than the timestamp of the previous backup. A full will transfer ALL files, therefore this is disk I/O + network bandwidth limited. 2TB of data will take 335 minutes at 1Gbps (assuming you can read from the source disk at least 1Gbps, and write to the destination disk at 1Gbps, and utilise 100% of source/destination disk bandwidth as well as 100% of network bandwidth, and there was nil overhead for handling each individual filename/etc... You are getting just under 20MB/sec, which is probably not unreasonable. As mentioned, if you want it faster, you will need to determine where the bottleneck is, which means looking at disk IO (most likely), network bandwidth, CPU (especially if you use compression on the backuppc server), etc... Regards, Adam -- Adam Goryachev Website Managers www.websitemanagers.com.au ------------------------------------------------------------------------------ Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET Get 100% visibility into your production application - at no cost. Code-level diagnostics for performance bottlenecks with <2% overhead Download for free and get started troubleshooting in minutes. http://p.sf.net/sfu/appdyn_d2d_ap1 _______________________________________________ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
