New page assignment tier
If you set the new page assignment tier value, when a new page is needed by a DP-VOL the page is taken from the specified tier aligned with the new page assignment tier value. You can set this function by using Hitachi Device Manager - Storage Navigator. In addition, this function becomes effective just after setting. The following table lists setting values:
|
Setting value |
Description |
|---|---|
|
High |
The new page is assigned from the higher tier of tiers set in the tiering policy. |
|
Middle |
The new page is assigned from the middle tier of tiers set in the tiering policy. |
|
Low |
The new page is assigned from the lower tier of tiers set in the tiering policy. |
The following tables show the tiers to which new pages are preferentially assigned.
|
Tiering Policy |
When specifying High |
When specifying Middle |
When specifying Low |
Note |
|---|---|---|---|---|
|
All |
From tier 1 to 2 |
From tier 1 to 2 |
From tier 2 to 1 |
If you set Low, tier 2 is given a priority over tier 1. |
|
Level 1 |
From tier 1 to 2 |
From tier 1 to 2 |
From tier 1 to 2 |
Assignment sequences when High, Middle, and Low are same. |
|
Level 2 |
From tier 1 to 2 |
From tier 1 to 2 |
From tier 2 to 1 |
Every assignment sequence is the same as when All is specified as the tiering policy. |
|
Level 3 |
From tier 1 to 2 |
From tier 1 to 2 |
From tier 2 to 1 |
Every assignment sequence is the same as when All is specified as the tiering policy. |
|
Level 4 |
From tier 1 to 2 |
From tier 1 to 2 |
From tier 2 to 1 |
Every assignment sequence is the same as when All is specified as the tiering policy. |
|
Level 5 |
From tier 2 to 1 |
From tier 2 to 1 |
From tier 2 to 1 |
Assignment sequences when High, Middle, and Low are same. |
|
Number |
Condition |
Order of new page allocation |
|---|---|---|
|
1 |
T1 MIN = 100% |
Same as Level1(1) |
|
2 |
T1 MAX = 0% |
Same as Level5(5) |
|
3 |
T1 MAX > 0% |
Same as All(0) |
|
Tiering policy |
When specifying High |
When specifying Middle |
When specifying Low |
Note |
|---|---|---|---|---|
|
All |
From tier 1, 2, to 3. |
From tier 2, 3, to 1. |
From tier 3, 2, to 1. |
Specifying High, Middle or Low to the assignment sequence is effective. |
|
Level 1 |
From tier 1, 2, to 3. |
From tier 1, 2, to 3. |
From tier 1, 2, to 3. |
Assignment sequences when High, Middle, and Low are same. |
|
Level 2 |
From tier 1, 2, to 3. |
From tier 1, 2, to 3. |
From tier 2, 1, to 3. |
If you set Low, tier 2 is given a priority over tier 1. |
|
Level 3 |
From tier 2, 3, to 1 |
From tier 2, 3, to 1 |
From the 2, 3, to 1 |
Assignment sequences when High, Middle, and Low are same. |
|
Level 4 |
From tier 2, 3, to 1 |
From tier 2, 3, to 1 |
From tier 3, 2, to 1 |
If you set Low, tier 3 is given priority over tier 2. |
|
Level 5 |
From tier 3, 2, to 1 |
From tier 3, 2, to 1 |
From tier 3, 2, to 1 |
Assignment sequences when High, Middle, and Low are same. |
|
Number |
Condition |
Order of new page allocation |
|---|---|---|
|
1 |
T1 MIN = 100% |
Same as Level1(1) |
|
2 |
T3 MIN = 100% |
Same as Level5(5) |
|
3 |
T1 MAX > 0% and T3 MAX = 0% |
Same as Level2(2) |
|
4 |
T1 MAX = 0% and T3 MAX = 0% |
Same as Level3(3) |
|
5 |
T1 MAX = 0% and T3 MAX > 0% |
Same as Level4(4) |
|
6 |
T1 MAX > 0% and T3 MAX > 0% |
Same as All(0) |