HP XP P9500 Storage - Manual (Page 99)

Solutions Tier relocation
operations Status of fixed
monitoring
information used in
tier relocation Status of data
collection in
progress Monitoring
information or
execution conditions
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 SATA.
◦
Configuration 2 (after change): Tier 1 is SSD, Tier 2 is SAS15K, and Tier 3 is SAS10K and SATA.
6. The monitor information statuses are valid (VAL), invalid (INV), and calculating (PND). See (page 104) . 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 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. 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. The default values can be
changed, if needed, using Remote Web Console or RAID Manager.
Total buffer area for new page
assignment buffer area for tier relocation Drive type
2% 0% 2% SSD
10% 8% 2% Non-SSD
Setting external volumes for each tier
If you use external volumes as pool-VOLs, you can put the external volumes in tiers by setting the
External LDEV Tier Rank for the external volumes. The External LDEV Tier Rank consists of the
following three types: High, Middle, and Low. The following examples describe how tiers may be
configured:
Example 1: When configuring tiers by using external volumes only
Tier 1: External volumes (High)
Tier 2: External volumes (Middle)
Tier 3: External volumes (Low)
Example 2: When configuring tiers by combining internal volumes and external volumes
Tier 1: Internal volumes (SSD)
Tier 2: External volumes (High)
Tier 3: External volumes (Low)
Smart Tiers 99