Relocation Priority - HP XP7 User Manual

Tiering policy
Level 3
Level 4
Level 5
Number
1
2
3
4
5
6

Relocation priority

If you use the relocation priority function, you can set the selection priority of a THP V-VOL when
performing relocation. With this setting, a prioritized THP V-VOL can be relocated earlier during
a relocation cycle. You can set this function by using Remote Web Console. The function is activated
after the monitoring data is collected.
If no relocation priority is set for all THP V-VOLs, the general order of THP V-VOL selection is
to select the next THP V-VOL in LDEV number order after the last THP V-VOL that fully performed
relocation. This selection order persists across relocation cycles.
If one or more THP V-VOLs is assigned a relocation priority, the prioritized THP V-VOLs are
operated upon in the early portion of the relocation cycle, before others in the general order
of THP V-VOL selection.
If V-VOL is not given priority for relocation:
For example, if LDEVs of LDEV IDs with LDEV#1, LDEV#2, LDEV#3, LDEV#4, and LDEV#5 are
not given priority for relocation, LDEVs are relocated with the following sequences. In this
example, three LDEVs are relocated in each period, but the number of LDEVs to relocate may
change by the relocation cycle or the data size.
Relocating cycle
T1
T2
T3
T4
When specifying High When specifying
Middle
From tier 2, 3, to 1 From tier 2, 3, to 1
From tier 2, 3, to 1 From tier 2, 3, to 1
From tier 3, 2, to 1 From tier 3, 2, to 1
Condition
T1 MIN = 100%
T3 MIN = 100%
T1 MAX > 0% and T3 MAX = 0%
T1 MAX = 0% and T3 MAX = 0%
T1 MAX = 0% and T3 MAX > 0%
T1 MAX > 0% and T3 MAX > 0%
Relocating Relocating
sequence of sequence of
LDEV#1 in each LDEV#2 in each
cycle cycle
1st 2nd
3rd Unperformed
Unperformed 1st
2nd 3rd
When specifying Low
From the 2, 3, to 1
From tier 3, 2, to 1
From tier 3, 2, to 1
Order of new page allocation
Same as Level1(1)
Same as Level5(5)
Same as Level2(2)
Same as Level3(3)
Same as Level4(4)
Same as All(0)
Relocating Relocating
sequence of sequence of
LDEV#3 in each LDEV#4 in each
cycle cycle
3rd Unperformed
Unperformed 1st
2nd 3rd
Unperformed Unperformed
Note
Assignment sequences when
High, Middle, and Low are
same.
If you set Low, tier 3 is given
priority over tier 2.
Assignment sequences when
High, Middle, and Low are
same.
Relocating
sequence of
LDEV#5 in each
cycle
Unperformed
2nd
Unperformed
1st
Smart Tiers 107