Esto en el bacula-sd en la tag  <device>
For ZFS assuming the default recordsize of 128K:
 
Device Type = Aligned
Media Type = Aligned
Maximum Block Size = 128 K
Minimum Block Size = 0
File Alignment = 128 K
Padding Size = 512
Minimum Aligned Size = 4096
Maximum Concurrent Jobs = 1

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Our testing with a ZFS kernel module installed on a Ubuntu 12.04 system
indicates that for our simple dataset (the Bacula Source + binaries), the
following Bacula parameters are optimal:
 
Device Type = Aligned
Maximum Block Size = 128 K
Minimum Block Size = 0
File Alignment = 128 K
Padding Size = 512
Minimum Aligned Size = 4K
 
• Our testing (as noted above) indicates that the following ZFS parameters are
optimal, where tank is the pool:
 
sudo zfs set atime = off tank
sudo zfs set compress = on tank
sudo zfs set dedup = on tank
sudo zfs set recordsize =128 k tank ( default )