HP XP7 Storage - Manual (Page 76)

Solutions Tier relocation
operations Status of fixed
monitoring
information used in
tier relocation Status of data
collection in
progress Monitoring
information or
execution conditions
collected during the
previous cycle
continues to be valid.
Add pool-VOLs, then
collect monitoring Suspended. No effect on the fixed
monitoring Continued. When the depletion
threshold of the pool
information and
relocate tiers again.
2
information. The
monitoring information
collected during the is nearly exceeded
during relocation.
previous cycle
continues to be valid.
Unnecessary. The
relocation is performed Suspended. The monitoring
information collected At the end time of
execution cycle, When execution
mode is Auto and the
automatically in the
next cycle. before monitoring
performance stops is
valid. data monitoring
stops. execution cycle ends
during tier relocation.
Collect the monitoring
information again if
necessary.
2
Continued. The monitoring
information collected
before suspension is
valid. Suspended. When execution
mode is Manual and
and 7 days elapse
after monitoring
starts.
Notes:
1. If the version of the DKCMAIN program is earlier than 70-06-0X-XX/XX, tier relocation continues.
2. The execution mode is Auto or the script is written in manual execution mode, information is monitored again
and tiers are relocated automatically.
3. The volume is monitored at the time of the next execution cycle.
4. All pages of the S-VOLs are not allocated, and the monitoring information of the volume is reset. After the
page is allocated to the new page, the monitoring information is collected.
5. Example: Pool-VOLs of SAS15K are added to the following configuration 1
◦
Configuration 1 (before change): Tier 1 is SSD, Tier 2 is SAS10K, and Tier 3 is SAS7.2K.
◦
Configuration 2 (after change): Tier 1 is SSD, Tier 2 is SAS15K, and Tier 3 is SAS10K and SAS7.2K.
6. The monitor information statuses are valid (VAL), invalid (INV), and calculating (PND). See “Execution modes
when using RAID Manager” (page 81) . In this case, the monitor information is invalid (INV). If monitoring is
in continue mode, the information of the mode is discarded.
Buffer area of a tier
Smart Tiers Z uses buffer percentages to reserve pages for new page assignments and allow the
tier relocation process. Areas necessary for processing these operations are distributed
corresponding to settings used by Smart Tiers Z. The following describes how processing takes
place to handle the buffer percentages.
Buffer space: The following table shows the default rates (rate to capacity of a tier) of buffer space
used for tier relocation and new page assignments, listed by drive type.
Total buffer area for new page
assignment buffer area for tier relocation Drive type
2% 0% 2% SSD
10% 8% 2% Non-SSD
76 Configuring thin provisioning