On Friday 10 July 2015 07.35:07 Conrad Lawes wrote: > I have been using Bareos for a couple years now and Bacula (Community > Edition) a few years before that. > > One thing that I have never gotten to work is hardware compression. I used > to use LTO3 tapes that natively storage 400GB and 800GB with compression. > Never got beyond 400GB. > > I've upgraded by tape library to a Dell TL2000 tape library with LTO6 tape > drive. > LTO6 natively stores 2.5TB and 6.25TB with compression. Hardware compression > is turned on. However, I never get above 2.5TB of data on each tape. > > I read somewhere that you must spool your data before writing to tape because > Bacula/Bareos requires a steady stream for compression to work. Tried that, > still no dice. And yes, I have disabled soft compression for my backup jobs. > All the documentation I found online are limited and/or out-of-date. > > I'm presently using 2 LTO6 tapes to complete a full backup (~3.5TB of data). > Obviously, my 2nd tape is under utilized and should not be required if 6.25TB > capacity is achievable. > > Is there any H/W compression expert that can shed some light on what is > required by Bareos to get compression working as advertised? > > > Thanks. > > > If you want to achieve those commercial compression sale rate, save only ascii text file or do some test with uncompressed tif image.
You will then achieve those ratio. Every binary is mostly compressed, all jpeg png files too and you will probably seen on a few % -- Bruno Friedmann Ioda-Net Sàrl www.ioda-net.ch openSUSE Member & Board, fsfe fellowship GPG KEY : D5C9B751C4653227 irc: tigerfoot -- You received this message because you are subscribed to the Google Groups "bareos-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. For more options, visit https://groups.google.com/d/optout.
