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AMANDA-COMPATIBILIT(7)		  Miscellanea		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.

   Amanda 3.2
       The following configuration configration	keywords are deprecated. This
       is currently a warning, but will	become an error	soon.

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

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

       o   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.

   Amanda 3.1
       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.

       o   label_new_tapes - use autolabel

   Amanda 2.6.1
       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.

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

       o   rawtapedev -	use tapedev instead

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

   Amanda 2.6.0
       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.

SEE ALSO
       amanda(8), amanda.conf(5)

       The Amanda Wiki:	: http://wiki.zmanda.com/

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

Amanda 3.3.9			  02/09/2016		AMANDA-COMPATIBILIT(7)

NAME | NETWORK COMPATIBILITY | UPGRADES | SEE ALSO | AUTHOR

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