Snapshots 9-5
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The filer uses the snap sched command to create snapshots automatically and to
keep them on-line for a predetermined amount of time.

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Table 9-3 describes the three types of automatic snapshots.

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Weekly The filer creates these every Sunday at midnight.
Weekly snapshots are called weekly.n, where n is an integer.
weekly.0 is the most recent weekly snapshot, and weekly.1 is the
next most recent weekly snapshot.
When the filer creates a weekly snapshot, the value of n is
adjusted for all weekly snapshots. The higher the value of n, the
older the snapshot.
Nightly The filer creates these every midnight except when a weekly
snapshot is scheduled to occur at the same time. If the number
of weekly snapshots is nonzero and its the day of the week that
weekly snapshots occur, no nightly snapshot is created.
Nightly snapshots are called nightly.n, where n is an integer.
nightly.0 is the most recent nightly snapshot, and nightly.1 is the
next most recent nightly snapshot.
When the filer creates a nightly snapshot, the value of n is
adjusted for all nightly snapshots. The higher the value of n, the
older the snapshot.
Hourly The filer creates these on the hour at specified hours, except at
midnight, if a nightly or weekly snapshot is scheduled to occur at
the same time. This occurs either if the number of nightly snap-
shots in the schedule is nonzero, or if the number of weekly
snapshots in the schedule is nonzero and its the day of the week
that weekly snapshots occur.
Hourly snapshots are called hourly.n, where n is an integer.

hourly.0 is the most recent hourly snapshot, and hourly.1 is the

next most recent hourly snapshot.
When the filer creates an hourly snapshot, the value of n is
adjusted for all hourly snapshots. The higher the value of n, the
older the snapshot.