On Wed, 7 Jan 2009, Chris Hoogendyk wrote: > Most backup software leaves the responsibility for planning more in the > sysadmin's hands. If the software is just writing data to the tape until > it hits the end of tape and then asking for another, hardware > compression is a logical choice.
Part of the preference for no hardware compression in Amanda and other packages is that a lot of them assume fixed tape sizes, so the only thing that hardware compression gets you is less time to write to that maximum. ie: Program assumes tape is 33Gb. When 33Gb is reached the program demands the tape be changed, even if the tape is only physically half used thanks to hardware compression Most of these types of programs have an all-or-nothing approach to restores. This is not exactly the bacula model. Even with hardware compression switched off, spooling is likely required to prevent shoeshining of modern tape drives. Spooling hardware MUST be fast enough to keep up. Switching on hardware compression increases those requirements but the budgetary increase is minor. ------------------------------------------------------------------------------ Check out the new SourceForge.net Marketplace. It is the best place to buy or sell services for just about anything Open Source. http://p.sf.net/sfu/Xq1LFB _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users