Sysadmin Worldsoft wrote: > I try to backup 193GB with bacula 2.0.3 on a tape library Powervault > 124T with LTO3. > > The backup take 7 hours to terminate. The specification for PV 124T is > "Supports maximum native transfer rates of 288GB/hr (LTO-3)" > > Any idea for this problem ? > I find that the overall throughput for my gigabit-connected LTO-3 jukebox seems to depend more on the makeup of the files being backed up than anything.
It's VERY fast on backups where it is doing large to medium files, and VERY slow on backups where it has to back up millions of tiny files. I have three webservers I back up that fit the "millions of small files" definition, and a full backup of each of them takes about 3 hours apiece. One of them for example is almost 7 million files, totalling about 39GB. That backup takes 3 hours, with3563.8 KB/s throughput (I spool to disk, then to tape). Another one, with a more normal compliment of files (6,626 files totalling 26,25GB) takes 19 minutes, with throughput of 22266.5 KB/s. All of the machines are identical hardware (IBM x336 eServers with 4GB ram, 2ea 10K rpm 300GB scsi drives in a RAID1 config) and OS (CentOS 4.4), but the distribution of file sizes is wildly different between the various servers, and backup throughput varies as illustrated here. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ------------------------------------------------------------------------- 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/ _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
