Hi, I am trying to improve my LTO-3 throughput. I recently installed a SAS Tandberg LTO-3 drive. I am using Bacula 3.0.3 in Ubuntu. I backup to disk files, and then copy to tape. The disk files are 4GB in size. They are stored on a 4 disk RAID 5 array. The raid and the tape drive are in the same system.
dd'ing a file from the raid to /dev/null yields: #dd if=vol-0572 of=/dev/null 8388576+1 records in 8388576+1 records out 4294951097 bytes (4.3 GB) copied, 45.0316 s, 95.4 MB/s disabling compression on the tape drive, and dd'ing the file from raid to /dev/nst1 yields: #dd if=vol-0572 of=/dev/nst1 bs=64K 65535+1 records in 65535+1 records out 4294951097 bytes (4.3 GB) copied, 77.9708 s, 55.1 MB/s enabling compression on the tape drive, and dd'ing the file from raid to /dev/nst1 yields: #dd if=vol-0572 of=/dev/nst1 bs=64K 65535+1 records in 65535+1 records out 4294951097 bytes (4.3 GB) copied, 43.1465 s, 99.5 MB/s These are the copy job throughput rates. The parent jobs of these three run concurrently, so all three jobs are in the same disk files. Rate: 5GB @ 22282.1 KB/s Rate: 8GB @ 22787.8 KB/s Rate: 5GB @ 19648.1 KB/s With the next two jobs, they do not run concurrent, so each disk file only contains the data of one job. Rate: 290GB @ 25024.7 KB/s Rate: 58GB @ 27998.8 KB/s This seems slower then it should be. brian- ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
