Oracle ZFS Storage Appliance Administration Manual page 268

Adding HTTP Access to a Share (BUI)
recognized by the NDMP service. After that, the DMA may need to be reconfigured because
tape device names may have changed.
In remote configurations, the tape devices are not physically connected to the system being
backed up and restored (the data server) but rather to the system running the DMA or a separate
system (the tape server). These are commonly called "3-way configurations" because the DMA
controls two other systems. In these configurations, the data stream is transmitted between the
data server and the tape server over an IP network.
NDMP Backup Formats and Types
The NDMP protocol does not specify a backup data format. The appliance supports three
backup types corresponding to different implementations and on-tape formats. DMAs can select
a backup type using the following values for the NDMP environment variable TYPE:
TABLE 62
Backup type
dump
tar
zfs
There is no standard NDMP data stream format, so backup streams generated on the appliance
can only be restored on ZFS storage appliances running compatible software. Future versions of
appliance software can generally restore streams backed up from older versions of the software,
but the reverse is not necessarily true. For example, the "zfs" backup type is new in 2010.Q3
and systems running 2010.Q1 (or earlier) cannot restore backup streams created using type
"zfs" under 2010.Q3.
NDMP Backup with Types dump and tar
When backing up with "dump" and "tar" backup types, administrators specify the data
to backup by a filesystem path, called the backup path. For example, if the administrator
configures a backup of /export/home, then the share mounted at that path will be backed up.
Similarly, if a backup stream is restored to /export/code, then that's the path where files will be
restored, even if they were backed up from another path.
268 Oracle ZFS Storage Appliance Administration Guide, Release OS8.6.x • September 2016
NDMP Backup Formats and Types
Details
File-based for filesystems only. Supports file history and
direct access recovery (DAR).
File-based for filesystems only. Supports file history and
direct access recovery (DAR).
Share-based for both filesystems and volumes. Does not
support file history or direct access recovery (DAR), but
may be faster for some datasets. Only supported with
NDMPv4.