HP XP7 User Manual page 104

implement the tiering policy at the end of the current monitoring cycle. See Example 1 in
"Execution mode settings and tiering policy" (page
If Manual is set as the execution mode, you must manually perform monitoring, issue a monitor
stop, then start relocation (see Example 2, Case 1, in
policy" (page
the monitoring data is used for the next tier relocation (see Example 2, Case 2, in
mode settings and tiering policy" (page
monitoring.
If a capacity shortage exists in the tier being set, a message may appear in the View Tier
Property window that the page allocation cannot be completed according to the tiering policy
specified for the V-VOL. Should that occur, the page allocation in the entire pool -- including
the tier that defines the tiering policy -- might not be optimized.
NOTE:
policy does not appear when these tiering policies are set:
◦
All(0)
◦
In a 2-tier configuration, Level2(2), Level3(3), or Level4(4) which is equivalent to All(0)
When a capacity shortage exists in a tier, you can revise the setting of the tiering policy or
the configuration of tiers. If the capacity of one tier is fully exhausted, the migrating pages
are assigned to the next tier according to the tiering policy.
◦
Level1(1): When tier 1 is full, the remaining pages are allocated to tier 2. If tier 2 is full,
the remaining pages are allocated to tier 3.
◦
Level3(3): When tier 2 is full, the remaining pages are allocated to tier 1. If tier 1 is full,
the remaining pages are allocated to tier 3.
◦
Level5(5): When tier 3 is full, the remaining pages are allocated to tier 2. If tier 2 is full,
the remaining pages are allocated to tier 1.
◦
Level2(2), Level4(4), and from Level6(6) to Level31(31): When the specified tier is full,
the unallocated pages are kept in the prior tier or they are allocated to the tier that has
free space.
If a performance shortage exists in the tier being set, pages may not be allocated in
conformance to the tiering policy specified for the V-VOL. In that case, pages are allocated
according to the performance ratio of each tier.
As shown in the following table, allocation capacity considerations are based on the tiering
policy.
Tiering Policy
All(0), Level2(2), or Level4(4)
Level1(1), Level3(3), or Level5(5)
From Level6(6) to Level31(31)
104 Configuring thin provisioning
105)). If you change the tiering policy settings while obtaining monitoring data,
The message that page allocation cannot be completed according to the tiering
Allocation capacity considerations
Tier range and I/O performance
Tier range
First phase: Tier range.
Allocation capacities in each tier.
◦
◦
◦
Second phase: Tier range and I/O performance.
105).
"Execution mode settings and tiering
105)). Therefore, you do not need to perform new
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.
"Execution