amanda-compatibility - Compatibility between Amanda versions

Author

DustinJ.Mitchell <dustin@zmanda.com>
           Zmanda, Inc. (http://www.zmanda.com)

Amanda 3.5.4                                       01/25/2025                             AMANDA-COMPATIBILIT(7)

Name

       amanda-compatibility - Compatibility between Amanda versions

Network Compatibility

       Amanda has used several on-the-wire protocols to communicate between the server and backup clients, and
       not all of them have been compatible.

       Versions of Amanda prior to about 2.3 used a different protocol which is not compatible. 2.3 is very old
       so this is not of general interest.

       The Amanda 2.4 series all use the same protocol. This protocol has support for extensibility. Generally
       upgrading clients or servers along the 2.4 branch does not cause difficulty.

       Amanda 2.5.0 uses the same protocol as 2.4. One can use a 2.5.0 server with 2.4 clients and a 2.4 server
       with 2.5.0 clients.

       Kerberos4 authentication in 2.5 is compatible with 2.4. In 2.5, kerberos4 encryption is broken, at least
       for the server.

       Amanda 2.5.1 introduced a new recover protocol. Backup communication works with any combination of
       versions, but 2.5.1's amrecover cannot communicate with an older server. Use oldamrecover on 2.5.1 and
       higher clients when communicating with an older server.

       Amanda 2.6.0 and later are completely compatible with 2.5.1.

       To restore a dump created with the tapesplit_size option using amrecover, you need at least a 2.5 server
       and late-2.4 client. (Extracting that backup using only shell, mt and dd is also possible.)

Upgrades

The recommended course for Amanda upgrades is to upgrade the server first, and test backups and restores
before upgrading clients. Consult the changes described below for the relevant span of versions to
determine what adjustments, if any, are required. Also see the NEWS file shipped with each Amanda release
for more detailed information.

Amanda3.2
The following configuration configration keywords are deprecated. This is currently a warning, but will
become an error soon.

• amrecover-do-fsf - amrecover always seeks to files when recovering

• amrecover-check-label - amrecover always checks the volume label when recovering

• Dumptype parameters tape-splitsize, split-diskbuffer, and fallback-splitsize - see allow-split and
tapetype parameters part-size, part-cache-type, part-cache-dir, and part-cache-max-size. See
amanda.conf(5) for more information on these new parameters, noting particularly that all but the
first are tapetype parameters, not dumptype parameters.

To convert most cases to the new parameters, set part-size to the old value of tape-splitsize and
part-cache-dir to the old value of split-diskbuffer, if present. If split-diskbuffer was set, then
set part-cache-type to disk, otherwise memory. Finally, if using memory caching, set
part-cache-max-size to the previous value of fallback-splitsize. Be sure to remove all of the old
keywords from your configuration.

Amanda3.1
Although it is a significant rewrite, there are no incompatible changes in this release.

Old-style changer scripts are deprecated in this release. While they remain available, they may be
removed in a future release. Consider upgrading to one of the new changer scripts. Users of chg-zd-mtx
are particularly encouraged to consider the much more intelligent chg-robot. See amanda-changers(7) for
more information.

The following configuration configration keywords are deprecated. This is currently a warning, but will
become an error in a future version.

• label_new_tapes - use autolabel

Amanda2.6.1
There are no incompatible changes in this release, but consider switching to some of the new applications
instead of the old GNUTAR and DUMP programs.

The following configuration configration keywords are deprecated. This is currently a warning, but will
become an error soon.

• tapebufs - use device-output-buffer-size instead

• rawtapedev - use tapedev instead

• file-pad - this is no longer optional, and all files are padded

Amanda2.6.0
amverify and amverifyrun are removed and replaced with amcheckdump(8). Both amdd and ammt are removed.

Some Amanda files are now installed in new amanda/ subdirectories: libraries are now installed in
$libdir/amanda and internal programs are now installed in $libexecdir/amanda.

The amandates file, previously at /etc/amandates, is now at $localstatedir/amanda/amandates. You may want
to move your existing /etc/amandates when you upgrade Amanda.

GLib is now required to build and run Amanda.