> is there anyone that have any stats on Bacula performance writing > volumes on harddisk for the following 3 cases: > 1. concurrent jobs, writing at the same time to one and the same volume > 2. concurrent jobs, writing at the same time to separate volumes (one > per job) > 3. jobs run 1 at a time. > > What would be the fastest (assuming that the disk data transfer is > less than network's, using 1Gbps). > Although someone can come up with benchmarks, I do not believe there is a simple answer here. The data rate you achieve during backups is highly dependent on many factors that are specific to your setup.
1) The job type. Full backups should get a much higher data rate than incrementals or differentials as the client will spend a lot of time thrashing through the filesystem searching for what has changed. 2) The database load. If you have millions of files in your backup the database will be bogged down reducing your throughput 3) The number of clients you are backing up at a time. Since most single clients will have a very hard time generating data at the rate it can be written it is often better to run more than one client at a time. 4) Software compression. If this is used your backup rate will significantly decrease on each client so you should run multiple clients at once to increase throughput. 5) Destination disk performance. If you are planning on archiving rates of > 50MB/s you will need a raid on the receiving end or multiple independent disks with each volume being on a different disk. 6) Jobs on a single client. Never run two jobs on a single client unless they are using different drives. 7) Spooling. It can help and it can hurt. 8) Signatures. Using MD5 or SHA does add some time to the backup. John ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
