Relocation priority, Formatted pool capacity, Relocation priority formatted pool capacity – HP XP P9500 Storage User Manual
Page 102
Note
When specifying Low
When specifying
Middle
When specifying High
Tiering level of the
tiering policy
Specifying High, Middle or
Low to the assignment
sequence is effective.
From tier 3, 2, to 1.
From tier 2, 3, to 1.
From tier 1, 2, to 3.
All
Assignment sequences when
High, Middle, and Low are
same.
From tier 1, 2, to 3.
From tier 1, 2, to 3.
From tier 1, 2, to 3.
Level 1
If you set Low, tier 2 is given
a priority over tier 1.
From tier 2, 1, to 3.
From tier 1, 2, to 3.
From tier 1, 2, to 3.
Level 2
Assignment sequences when
High, Middle, and Low are
same.
From the 2, 3, to 1
From tier 2, 3, to 1
From tier 2, 3, to 1
Level 3
If you set Low, tier 3 is given
priority over the tier 2.
From tier 3, 2, to 1
From tier 2, 3, to 1
From tier 2, 3, to 1
Level 4
Assignment sequences when
High, Middle, and Low are
same.
From tier 3, 2, to 1
From tier 3, 2, to 1
From tier 3, 2, to 1
Level 5
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.
Formatted pool capacity
The formatted pool capacity is the capacity of initialized free space in the pool, not the capacity
of all the free space in the pool. The free space of the pool is monitored by a storage system.
Space is formatted automatically if needed. You can confirm the formatted pool capacity in the
View Pool Management Status window (see
). Dependent on the load of the storage
system, the format speed of the free space of the pool is adjusted.
New pages are allocated, then initialized, during data write operations to the V-VOL. If a significant
number of new pages are allocated, initialization might be delayed as a result of conflicts between
data write and new page initialization processes. Such conflicts could occur, for example, when
you create a file system of new THP V-VOLs from the host. You can initialize the free space of a
pool in advance to prevent delays in data write operations.
The format function for a free space of a pool does not operate by default. When using the format
function for the free space of a pool, contact the HP Technical Support to set the system option
mode to 896.
102 Configuring thin provisioning