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Hi all,

I noticed lines such as

  ...
  FD Files Written:       965
  SD Files Written:       965
  FD Bytes Written:       1,251,958,893 (1.251 GB)
  SD Bytes Written:       1,252,111,781 (1.252 GB)
  Rate:                   1638.7 KB/s
- ->Software Compression:   92.7 %
  VSS:                    no
  Encryption:             no
  Accurate:               yes
  ...

appearing in my Bacula logs since 5.2.1 when running Accurate Differential
backups, indicating that software compression is enabled.

However, none of my config files explicitly set this:

...
JobDefs {
  Name = "DefaultJob"
  Storage = StorageLoader
  Messages = Standard
  SpoolData = yes
  Accurate = yes
  Pool = Default # will be overwritten in Schedule
}

Job {
        JobDefs = "DefaultJob"
        Name = "EreborBackup"
        Client = erebor-fd
        FileSet = "FullErebor"
        Type = Backup
        Schedule = "WeeklyErebor"
        Priority = 11
}
...

On the contrary, I have explicitly disabled software compression, intending to
rely on the LTO-4 tape drives hardware compression instead.

...
Storage {
  Name = StorageLoader
  Address = gundabad
  SDPort = 9103
  Password = "foobar"
  Device = StorageLoader
  Media Type = LTO-4
  Autochanger = yes
  AllowCompression = no <--
}
...

Full backups using the same file set are indeed performed without software
compression:

  ...
  FD Files Written:       265,765
  SD Files Written:       265,765
  FD Bytes Written:       16,630,792,412 (16.63 GB)
  SD Bytes Written:       16,670,647,288 (16.67 GB)
  Rate:                   18037.7 KB/s
- ->Software Compression:   None
  VSS:                    no
  Encryption:             no
  Accurate:               yes
  ...

The changed default (forced use?) of software compression for Accurate
Differentials appears to have been introduced with Bacula 5.2.1. Bacula 5.0.3
Accurate Differential backup logs for the same FileSet show that the older
version did indeed refrain from using software compression:

  ...
  FD Files Written:       9,381
  SD Files Written:       9,381
  FD Bytes Written:       16,041,641,600 (16.04 GB)
  SD Bytes Written:       917,897,888 (917.8 MB)
  Rate:                   22883.9 KB/s
- ->Software Compression:   None
  VSS:                    no
  Encryption:             no
  Accurate:               yes
  ...

What do I have to do to turn off software compression for Accurate
Differentials? Or has it actually become advantageous to use software 
compression?

Many thanks,
  Andreas
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