Notes on setting tiering level – HP XP P9500 Storage User Manual
Page 100
Notes on setting tiering level
•
If Auto is set as the execution mode, tier relocation is performed based on the monitoring
cycle. Therefore, when the tiering level setting is changed, tier relocation will automatically
implement the tiering policy at the end of the current monitoring cycle (see Example 1 in
.
•
If Manual is set as the execution mode, you must manually perform monitoring, issue a monitor
stop, and then start relocation (see Example 2, Case 1, in
). If you change the tiering
level settings while obtaining monitoring data, the monitoring data is used for the next tier
relocation (see Example 2, Case 2, in
). Therefore, you do not need to perform new
monitoring.
•
If the assignment of THP V-VOLs to a tiering level causes the tier capacity to be exceeded,
then all the THP V-VOLs pages may not be allocated to the desired tier due to deficiency of
the a tier’s capacity. In this case, the pages that are not allocated to the desired tier are
allocated to the tier nearest to the specified tier. When a tier is full, the tier to be assigned is
as follows:
◦
For level 1 and level 2, when tier 1 is full, the pages are allocated to tier 2. If tier 2 is
full, the pages are allocated to tier 3.
◦
For level 3, when tier 2 is full, the pages are allocated to tier 1. If tier 1 is full, the pages
are allocated to tier 3.
100 Configuring thin provisioning