Example of reserving tier capacity

The reservation priority depends on the level of tiering policy. The following figure shows the reservation priority. Tiers are reserved in order of priority from (1) to (7) in the figure. If the pool-VOL capacity is deficient when you reserve a tier, the nearest tier of your specified tier is allocated. If you specify two tiers like level 2 or level 4 of the tiering policy, the upper tier is reserved. If the capacity of the pool-VOL assigned to the upper tier is deficient, the lower tier defined by the tiering policy is reserved. For example, in case of level 2 in the following figure, tier 1 is reserved first. If the capacity of tier 1 is deficient at this point, tier 2 is reserved. For details, see Notes on tiering policy settings.