New page assignment tier – HP XP P9500 Storage User Manual
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Allocation capacity considerations
Tiering Policy
Allocation capacities in each tier.
◦
Tier1: The setting value(%) in Tier1 Min.
◦
Tier2: The value deducted Tier1 Max(%) and Tier3 Max(%) from 100(%).
◦
Tier3: The setting value(%) in Tier3 Min.
Second phase: Tier range and I/O performance.
Capacities deducted from the allocated capacities of the first phase from
the total used capacity, are allocated to each tier.
New page assignment tier
If you set the new page assignment tier value, when a new page is needed by a THP-VOL the page
is taken from the specified tier aligned with the new page assignment tier value. You can set this
function by using Remote Web Console. In addition, this function becomes effective just after
setting. The following table lists setting values:
Description
Setting value
The new page is assigned from the higher tier of tiers set in the tiering policy.
High
The new page is assigned from the middle tier of tiers set in the tiering policy.
Middle
The new page is assigned from the lower tier of tiers set in the tiering policy.
Low
The following tables show the tiers to which new pages are preferentially assigned.
Note
When specifying Low
When specifying
Middle
When specifying High
Tiering Policy
If you set Low, tier 2 is given
a priority over tier 1.
From tier 2 to 1
From tier 1 to 2
From tier 1 to 2
All
Assignment sequences when
High, Middle, and Low are
same.
From tier 1 to 2
From tier 1 to 2
From tier 1 to 2
Level 1
Every assignment sequence
is the same as when All is
From tier 2 to 1
From tier 1 to 2
From tier 1 to 2
Level 2
specified as the tiering
policy.
Every assignment sequence
is the same as when All is
From tier 2 to 1
From tier 1 to 2
From tier 1 to 2
Level 3
specified as the tiering
policy.
Every assignment sequence
is the same as when All is
From tier 2 to 1
From tier 1 to 2
From tier 1 to 2
Level 4
specified as the tiering
policy.
Assignment sequences when
High, Middle, and Low are
same.
From tier 2 to 1
From tier 2 to 1
From tier 2 to 1
Level 5
Smart Tiers Z
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