Example of reserving tier capacity
The reservation priority depends on the level of tiering policy. The following figure illustrates 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, first of all the upper tier is reserved. At this time, if the capacity of the pool-VOL assigned to the upper tier is deficient, the lower tier defined by the tiering policy is reserved automatically. For example, in case of level 2 in the diagram below, tier 1 is reserved first. If the capacity of tier 1 is deficient at this point, tier 2 is reserved automatically. For details, see Notes on tiering policy settings.
|
Tier reservation priority |
Tiering policy |
Reserved tier |
|
1 |
Level1(1) |
Tier 1 |
|
2 |
Level3(3) |
Tier 2 |
|
3 |
Level5(5) |
Tier 3 |
|
From 4 to 29 |
From Level6(6) to Level31(31) |
The custom policy whose number is small is prioritized. Tier 1: From Level6(6) to Level31(31), each of the Tier1 Min values are reserved. Tier 2: From Level6(6) to Level31(31), each of values that deducted the total value of Tier1 Max and Tier3 Max from 100(%) are reserved. Tier 3: From Level6(6) to Level31(31), each of the Tier3 Min values are reserved. |
|
30 |
All(0) |
All tiers |
|
Level2(2) |
Tier 1 and Tier 2 | |
|
Level4(4) |
Tier 2 and Tier 3 | |
|
From Level6(6) to Level31(31) |
Tier 1: From Level6(6) to Level31(31), each of the Tier1 Max values are reserved. Tier 3: From Level6(6) to Level31(31), each of the Tier3 Max values are reserved. |
