Tiering Policy - HP XP7 User Manual

Item Does each pool output
the log information?
Performance Util Yes
Tier2 (%)
Performance Util Yes
Tier3 (%)
Tier1 Low Range No
Tier2 High Range No
Tier2 Low Range No
Tier3 High Range No
Reclaim Zero Page Yes
Num
Non Compliant Yes

Tiering Policy

Number
Notes
1. If the log file is lfv2 (Log Format Version 2) or later, the log file information of each V-VOL appears. If the log file is lfv 1, a
hyphen appears.
2. When deleting pool-VOLs, ex-valid monitor information are discarded, so that the tier relocation is interrupted. After completion
of the pool-VOLs deleting, the tier determination calculation performs again and completes. Processed by this way, the valid
monitor information are re-created.
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
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
on a THP V-VOL" (page
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).
92 Configuring thin provisioning
Does each V-VOL
output the log
information?
No
No
Yes
Yes
Yes
Yes
Yes
No
"Tiering policy expansion" (page
"Tiering policy expansion" (page 93)
94).
Type of information Description
Monitoring result Performance utilization of tier 2. The
performance utilization is the current I/O
percentage based on the maximum
performance of tier 2.
Monitoring result Performance utilization of tier 3. The
performance utilization is the current I/O
percentage based on the maximum
performance of tier 3.
Monitoring result Lower limit in a range for tier 1.
Monitoring result Higher limit in a range for tier 2.
Monitoring result Lower limit in a range for tier 2.
Monitoring result Higher limit in a range for tier 3.
Tier relocation Number of pages processed in an
operation to reclaim zero pages.
Monitoring result Number of a tiering policy that does not
conform to the current tier configuration.
A non-compliant policy prevents tier
relocation.
93).
and "Setting tiering policy