What is the mechanism to calculate storage used per day?
Storage charge is counted in unit GB-Day which is the average amount of storage used per day. GB-Day is calculated by sampling method. Aspen Cloud Storage billing system takes sample of storage usage per 2 hours per customer. The exact sampling time interval is little bit different per customer account. Since there are 24 hours per day, 12 samples are taken everyday. For each sampling, the amount of storage usage (in byte) will be multiplied by 2 which means assuming next 2 hours after sampling will be same usage amount. The 2-hours storage amount accumulated to “Daily Byte-Hours”. At the end of each day, “Daily Byte-Hours” is converted to GB and then divided by number of hours of that day. The calculated result is in “GB-Day”.