Yes indeed, but my point was that it was not always so. This change
was something I and others campaigned for quite some time ago.
Indeed, in the early days of ZFS evangelism (when I was still at Sun)
the issue came up rather often. In those days there were even more
reasons not to use a zfs send stream as a backup.
My point was made partly to celebrate this welcome change (as
reflected in the manpage) because I was pleasantly surprised to find
that the change we had requested has already been delivered.
The other reason for my point was to remind people that there may be
system out there for which this may not be the case, in which the old
restrictions still hold until the relevant patches and/or upgrades
have been applied.
Indeed, the heads up link I posted seems to imply that there are still
some older versions of ZFS stream format which cannot be imported -
that backwards compatibility has its reasonable limits.
When it come to Erik's exciting extention beyond what is already good
news, perhaps the manpage needs to be stronger? It would be a shame
for such useful information to be accessible only to random googlers
and the august readers of this list.
On 14 Nov 2009, at 17:58, Miles Nordin <car...@ivy.net> wrote:
"ph" == Phil Harman <phil.har...@gmail.com> writes:
"The format of the stream is committed. You will be able to
receive your streams on future versions of ZFS."
What Erik said is stronger than the man page in an important way,
though. He said you can dump an old stream into a filesystem on a new
zpool, and when you 'zfs send' the stream back out, it'll be in the
old format. Keeping this commitment means you can store s10 streams
on snv_xxx backup servers as expanded filesystems, not
stream-inside-a-file, and still restore them onto s10 by 'zfs send'ing
from nevada. One reason this makes sense as something one might
actually do because zpools are a lot more resilient to corruption than
'zfs send' streams.
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