Still puzzled by the output of zfs list. In particular the REFER
header. 

NAME                          USED  AVAIL  REFER  MOUNTPOINT
[...]
p1/vb                        1.54T   556G  26.9G  /vb
p1/vb/vm                      738G   556G   323G  /vb/vm

Why the massive difference between USED and REFER

and what does REFER actually mean?

Googling this finds massive info about zfs and probably a snippet in
there somewhere will explain it, but finding it is not so easy.

With google's dumbed down search capabiility using quotes around REFER or
the like doesn't seem to pare the field.

A google seach like [ understanding "zfs list output" ] without
the brackets (used here to indicate the string used), but with quotes as
shown, two of the first hits are all about snapshots instead of
explaining the basic meaning of the headline colums.

Even adding `-snapshot'  to try to cut to the chase seems only to
produce plenty of discussion about zfs and zfs list but so far I find
no simple and succinct exposition of what the heads mean.

man zfs has one occurrence of `REFER' and it is not about its
meaning.  Searching "man zfs" on `list output' gets no hits at all.

Such a strait forward question must have a full answer somewhere.

Can anyone help me find it?


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