Bob wrote:

/usr is a 33GB HW/Raid partition, how can it possibly hold 6 33GB snapshots???


If I mount each one of these, they all report to df that they are indeed 33BB file systems!

How is this magic achieved?
Is there a doc somewhere with an explaination?
Snapshots only hold the originals of blocks that have changed, but still look like a complete file system when you mount them.

From man mount:

                        Further details can be found in the file at
                         /usr/src/sys/ufs/ffs/README.snapshot.
which should have a pointer to the original paper.

--Alex


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