On 20/08/12 16:29, lst_ho...@kwsoft.de wrote: > 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"
Test the speed of writing to/from disk as well as your tape speeds. SSDs have high IOPS/seek rates but they're not always as fast for sequential operations as you might expect. ------------------------------------------------------------------------------ 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
