Dell PowerVault 720N, Command Reference Manual, Page: 257 / 606

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.