Ordinary volume snapshots are configured with the "snap sched" command. Snapshots made this way are named "weekly.#", "nightly.#", or "hourly.#", where # is a non-negative integer starting with 0.
The syntax for configuring ordinary snapshots is:
snap sched [volname [W N H[@h,h,h,h]]]
W = the number of weekly snapshots to retain
N = the number of daily snapshots to retain
H = the number of hourly snapshots to retain
@h,h,h,h = an optional parameter for specifying at which hours the hourly snapshots should be taken. The "h,h,h,h" is a comma list of hours at which to creat the snapshots.
So, to configure a volume named vol1 to retain 8 weeks of weekly snapshots, 14 nightly, and 0 hourly snapshots, the command is:
snap sched vol1 8 14 0
To configure a volume named vol2 to retain 4 weekly snapshots, 7 nightly snapshots, and 6 hourly snapshots taken at 6 a.m., 12 noon, and 6 p.m. each day, the command is:
snap sched vol2 4 7 6@6,12,18
Please bear in mind that weekly snapshots have a higher priority than nightly snapshots and that nightly snapshots have a higher priority than hourly snapshots. As a result, at 00:00 on Sunday night, a volume which is configured to create both weekly and nightly snapshots will create a weekly snapshot but not a nightly snapshot.
If you want to check a volume's snapshot schedule, you can type:
snap sched [volname]
If no volume is specified, you will see the snapshot schedules for all volumes on that controller.
SnapVault snapshots are a bit more complicated to explain. Do you use SnapVault on your filers?
Bill
