Brock Pytlik wrote:
On the other hand, it would mean that removing earlier BE's would give a
user an easy way to reduce their disk consumption since deleting the old
BE's would clear up space. But, at least on my system, old BE's take a
minute amount of disk space compared to my currently booted one (on the
order of 50M-3G compare4d to 38G for my current BE).
The way space is accounted for is misleading:
referenced
The amount of data that is accessible by this dataset,
which may or may not be shared with other datasets in
the pool. When a snapshot or clone is created, it ini-
tially references the same amount of space as the file
system or snapshot it was created from, since its con-
tents are identical.
This property can also be referred to by its shortened
column name, "refer".
used
The amount of space consumed by this dataset and all its
descendents. This is the value that is checked against
this dataset's quota and reservation. The space used
does not include this dataset's reservation, but does
take into account the reservations of any descendent
datasets. The amount of space that a dataset consumes
from its parent, as well as the amount of space that are
freed if this dataset is recursively destroyed, is the
greater of its space used and its reservation.
When snapshots (see the "Snapshots" section) are
created, their space is initially shared between the
snapshot and the file system, and possibly with previous
snapshots. As the file system changes, space that was
previously shared becomes unique to the snapshot, and
counted in the snapshot's space used. Additionally,
deleting snapshots can increase the amount of space
unique to (and used by) other snapshots.
The amount of space used, available, or referenced does
not take into account pending changes. Pending changes
are generally accounted for within a few seconds. Com-
mitting a change to a disk using fsync(3c) or O_SYNC
does not necessarily guarantee that the space usage
information is updated immediately.
- Bart
--
Bart Smaalders Solaris Kernel Performance
[email protected] http://blogs.sun.com/barts
"You will contribute more with mercurial than with thunderbird."
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