On 07/05/2013, at 09:15 a.m., John Drescher <dresche...@gmail.com> wrote:
>> I see that LTO 6 holds 2.5T data per tape, or 6.25T compressed. > > The 6.25TB is only an estimate. If you have non compressible data you > will get close to 2.5 TB of space on your tape. If you have all text > files you may fit 15 TB on a single tape.. > >> I've never used HW compression before so am wondering whether its >> performance is variable like SW compression. i.e. depends on the >> file contents just what kind of compression ratio you'll get. >> >> And also how reliable is it? If it is just as reliable why would >> someone choose not to use it (and therefore why is there an option to >> not use it)? > > HW compression is 100% reliable. Just leave compression on at the HW > level and make sure you have software compression off. HW compression > will not slow down your backups and it will not reduce your tape if > you have non compressible data. > > John > > ------------------------------------------------------------------------------ > Learn Graph Databases - Download FREE O'Reilly Book > "Graph Databases" is the definitive new guide to graph databases and > their applications. This 200-page book is written by three acclaimed > leaders in the field. The early access version is available now. > Download your free book today! http://p.sf.net/sfu/neotech_d2d_may > _______________________________________________ > Bacula-users mailing list > Bacula-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/bacula-users Currently I have a LTO3 magazine with HW compression on. From a theoretical max storage of 400GB, sometimes it gets very good compression rates, and manages to fit near 700GB. I had it turned off before, and since I turned it on I haven't noticed any difference in backup time. My recommendation: turn off SW compression and let the hardware do its job. LDC - Gustavo El Khoury ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. This 200-page book is written by three acclaimed leaders in the field. The early access version is available now. Download your free book today! http://p.sf.net/sfu/neotech_d2d_may _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
