Isilon: Snapshot Schedule duration and how are they calculated

For this example, we use one Year. When setting the year on a snapshot schedule, you see the following 1Y6D. This could be any number of durations that you choose; the answer is the same.

Example when setting "--duration=1Y" using: isi snapshot schedules create

t822x-1# isi snapshot schedules view test1
           ID: 4
         Name: test1
         Path: /ifs/data/testfolder
      Pattern: ScheduleName_duration_%Y-%m-%d_%H:%M
     Schedule: the 1 every 1 month at 12:00 PM
     Duration: 1Y6D <<<<<<
        Alias: -

The papi code constructs define the following values.

const int MAX_WEEKS = 105; // 2 years
const int MAX_DAYS = 100;
const int MAX_HOURS = 120; // 5 days

After 100 days, the cluster uses weeks.

So here, 1 year is 365 days, 365/ 7 = 52.14 weeks which equals 52.14 weeks. Rounding up we get 53 Weeks or 1 Year and 6 days.

If the customer wanted to use a year for the value, they would have to annotate that by using 52 weeks not using days. As the duration value is using weeks.