On 11/18/2011 04:15 PM, Ted MacNEIL wrote:
I'm glad to know "n-2" compatibility is now supported. If that were true long
ago when the previous dfdss 64KiB change was made, it
certainly wasn't advertised then.
Funny, I thought n-1 was supported for a long time!
-
Ted MacNEIL
eamacn...@yahoo.ca
Twitter: @TedMacNEIL
Obviously this depends on what is meant by "compatibility" PTFs.
New dfdss versions have always been compatible in reading dumps produced
by previous version(s) - changes that invalidated archived dfdss tapes
would not be tolerable..
I also can't recall a case other than the 64K block size change where
the n-1 version wasn't able to read tapes produced by version n as long
as you didn't explicitly use some new features introduced in the new
version. The problem with the 64K block change was that you got the new
feature by default. I may have missed it, but I don't remember there
being a PTF to the old version to allow it to read 64K blocks, at least
not at the time we migrated.
In some cases the best you can hope for is toleration support for the
n-1 version so that it will try to do something reasonable or at least
give meaningful warnings or errors if there is some new construct in the
dump file related to a new feature in version n that the old version
can't fully handle.
--
Joel C. Ewing, Bentonville, AR jcew...@acm.org
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