HP XP P9500 Storage - Manual (Page 73)

Tier monitoring and relocation cycles
Performance monitoring and tier relocation can be set to execute in one of two execution modes:
Auto and Manual. You can set up execution modes, or switch between modes by using either the
Remote Web Console RAID Manager.
In Auto execution mode, monitoring and relocation are continuous and automatically scheduled.
In Manual execution mode, the following operations are initiated manually.
•
Start monitoring
•
Stop of monitoring
•
Start relocation
•
Stop of relocation
In both execution modes, relocation of data is automatically determined based on monitoring
results. The settings for these execution modes can be changed nondisruptively while the pool is
in use.
•
Auto execution mode
Auto execution mode performs monitoring and tier relocation based on information collected
by monitoring at a specified constant frequency: 30 minutes, or from 1, 2, 4, 8, or 24 hours.
All Auto execution mode cycle frequencies have a starting point at midnight. Using the 24-hour
monitoring cycle, you can also specify the times of day to start and stop performance
monitoring.
For example, if you specify 8 hours, performance monitoring uses an 8-hour cycle (0:00 to
8:00, 8:00 to 16:00, and 16:00 to 0:00) and tier relocation begins at the end of each 8-hour
cycle.
•
Manual execution mode
You can start and stop performance monitoring and tier relocation at any time. You should
keep the duration of performance monitoring to less than 7 days (168 hours). If performance
monitoring exceeds 7 days, then monitoring stops automatically.
Manual execution mode starts and ends monitoring and relocation at the time the command
is issued from Remote Web Console or RAID Manager. You can use scripts, which provide
flexibility to control monitoring and relocation tasks based on a schedule for each day of the
week.
When Smart Tiers is configured for automatic operations, the monitoring feature will be enabled
and the time period for monitoring is set for all or part of a 24-hour period. At the end of each
monitoring period, the relocation task is performed automatically.
Tier relocation flow
The following shows the flow of allocating new pages and migrating them to the appropriate tier.
The combination of determining the appropriate storage tier and migrating the pages to the
appropriate tier is referred to as tier relocation.
Smart Tiers 73