HP XP P9500 Storage User Manual
Page 97
•
Frequency distribution is unavailable when there is no data provided by performance
monitoring.
•
While the frequency distribution graph is being created or the tier range values are being
calculated, the frequency distribution graph is not available. The time required for determining
the tier range values varies depending on the number of THP V-VOLs and total capacity. The
maximum time is about 20 minutes.
•
To balance the usage levels of all pool-VOLs, rebalancing may be performed after several tier
relocation operations. If rebalancing is in progress, the next cycle of tier relocation might be
delayed.
For details on rebalancing, see
The status of data collection, fixed monitoring, and tier relocation operations are described
in the following table. The latest fixed monitoring information is referenced when tiers are
relocated.
Solutions
Tier relocation
operations
Status of fixed
monitoring
information used in
tier relocation
Status of data
collection in
progress
Monitoring
information or
execution conditions
Unnecessary. After the
pages are allocated,
Tiers of the pages
are not relocated.
No monitoring
information on pages.
Pages are not
monitored.
Unallocated pages.
monitoring and
relocation are
performed
automatically.
Unnecessary. After the
pages are allocated,
Tiers of the pages
are not relocated.
Only monitoring
information on pages
is invalid.
Monitoring on
pages is reset.
Zero data is
discarded during
data monitoring.
monitoring and
relocation are
performed
automatically.
N/A
Tiers of the pages
are not relocated.
Monitoring
information on the
volume is valid.
Volume is
monitored.
V-VOL settings do not
allow tier relocation.
N/A
Tier relocation of
the volume is
suspended.
Only monitoring
information on the
volume is invalid.
Volume is not
monitored.
When V-VOLs are
deleted
Collect the monitoring
information again if
necessary.
2
Suspended.
1
Monitoring
information collected
before suspension is
valid.
Suspended.
When execution
mode is changed to
Manual from Auto or
vice versa.
Collect the monitoring
information again if
necessary.
2
Tier relocation is
suspended by
powering OFF and
is resumed after
powering ON.
Monitoring
information collected
during the previous
cycle is continuously
valid.
Monitoring is
suspended by
powering OFF and
is not resumed even
after powering
ON.
2
When the power
switch is power ON
or OFF.
Collect the monitoring
information again if
necessary.
2
Tiers of the pages
are not relocated.
Monitoring
information is invalid
and the volumes need
to be monitored.
The volume is not
monitored.
3
◦
When Auto LUN
V2 is performed.
◦
When Quick
Restore of
Business Copy is
performed.
Smart Tiers
97