Tier relocation log file contents, Tiering policy – HP XP P9500 Storage User Manual
Page 107
Tier relocation log file contents
The tier relocation log file is a tab-delimited file and contains the following information:
Description
Item
Displays the pool ID.
Pool ID
Displays the time and date when the performing the relocation function starts.
Start Relocation Time
Displays the time and date when the performing the relocation function ends.
End Relocation Time
Displays the section where the relocation result is shown.
Result
Displays the execution results that are Normal or Cancel.
Status
Displays the following causes of cancellation. A hyphen (-) is displayed when the
execution status is Normal.
Detail
•
It was interrupted by annulling the monitor data. Monitoring information with a
status of valid or calculating is discarded under certain conditions.
•
It was interrupted by not completing within the cycle of relocation.
•
The tier relocation was interrupted because the threshold reached the vicinity of
the upper limit. The information appears when the pool usage level reaches the
depletion threshold of the pool.
•
It was interrupted by a user instruction.
Displays the number of pages that are moved between tiers.
Move Page Num
Displays the number of pages that are moved from tier1 to tier2.
Tier1->Tier2
Displays the number of pages that are moved from tier1 to tier3.
Tier1->Tier3
Displays the number of pages that are moved from tier2 to tier1.
Tier2->Tier1
Displays the number of pages that are moved from tier2 to tier3.
Tier2->Tier3
Displays the number of pages that are moved from tier3 to tier1.
Tier3->Tier1
Displays the number of pages that are moved from tier3 to tier2.
Tier3->Tier2
Tiering policy
The tiering policy function is used to assign a specific storage tier to a specific THP V-VOL. A tiering
policy specifies subset of tiers that is available to a given set of THP V-VOLs.
Tier relocation changes the location of previously stored data. It is performed in conformance to
the tiering policy. If a THP V-VOL is initially allocated to a low-speed tier and the tiering policy is
changed to a high-speed tier, relocation is performed in the next cycle.
For example, if you set the tiering policy level on a V-VOL(THP V-VOL) to a tier with a high I/O
speed, the data is always stored on the high-speed tier when relocating tiers. When you use that
V-VOL(THP V-VOL), regardless of the actual size of the I/O load, you can always get high-speed
responses. See
“Tiering policy expansion” (page 108)
When you create the THP V-VOL, you can designate one of six existing tiering policies and define
up to 26 new tiering policies. See
“Tiering policy expansion” (page 108)
and
.
Use the Edit LDEVs window to change the tiering policy settings. When tier relocation occurs, the
related tiering policy set for the THP V-VOL is used to relocate data to the desired tier or tiers.
The tiering policy does not own pool capacity. Rather, pool capacity is shared among tiers. Pages
are allocated in order of priority from upper to lower tiers in a tiering policy. When you specify
a new allocation tier, pages are allocated starting from the tier that you specify.
The tier range, frequency distribution, and used capacity are displayed per tiering policy: existing
tier level All(0), Level1(1) through Level5(5) and Level6(6) to Level31(31).
Smart Tiers 107