Hello List this has been discussed already some times on the list but as i have ssen no real conclusion i will ask for opinion again. The setup is Bacula 5.2.10 on Ubuntu 12.04 LTS (x64) with a LTO-4 drive connected through Adaptec 29320LPE, a 320MByte/sec PCI-Express controller. To prevent the LTO-4 tape from shining/whining around we use the Data spool feature on a SSD drive (Intel Postville Refresh 120GB) with "Maximum Spool Size = 20GB" and "Maximum File Size = 4GB". This works as expected beside the fact that the transfer spped max. out at ~84MBytes/sec with encrypted data (hard to further compress) and 86MBytes/sec without encryption when using Bacula. To test if the hardware is to blame i have done some simple dd to tape like this
"dd if=/some/file of=/dev/nst0 bs=xxK" which lead to ~110MBytes/sec with bs=64K and ~140MBytes/sec with bs=1M As the tape is altering speed all the time with Bacula i would like to know if there is a possibility to get closer to the dd values and what could be the bottleneck in such a setup? It would also be helpful if someone has compareable results for LTO-4 with Bacula to see if we are on the right track. Many Thanks Andreas ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
