HP XP P9500 Storage - Manual (Page 85)

Tiering policy examples
The following figure shows an example of data allocation when the default tiering policy level All
is specified. Pages in the THP V-VOL are relocated to any tier.
The following figure shows an example of data allocation when setting the tiering policy to tier 1
(see Level 1 in
“Tiering policy levels” (page 86) ). In this case, pages in the THP V-VOL are relocated
to tier 1, and are not relocated to other tiers.
Setting tiering policy on a THP V-VOL
The setting of a tiering policy for a THP V-VOL is optional. If one is not selected, the default is the
All tiering policy level. The available levels are listed in
“Tiering policy levels” (page 86) ). In one
pool, THP V-VOLs in which different tiering policies were set can coexist. If you specify the level
of the tiering policy, THP V-VOLs to which the same policy is set are grouped.
•
All is the default tiering policy value. In this case, data is stored in any of the tiers.
•
To narrow down the tier to use, set the tiering policy to level 1 or 5. A tiering policy setting
of level of 2, 3, 4, and All are the same. However, the setting of the level 2, 3, and 4 will be
different in some future release of the microcode.
•
When a tier is added to the pool after setting the tiering policy on a THP V-VOL, the THP
V-VOL is relocated according to the new tier lineup.
For example, if you set the tiering policy to level 5, the data is always allocated in the lowest
tier. If the pool has two tiers, data is stored in tier 2. If a new tier is added, the number of
tiers becomes three, and relocation will be performed to move data into tier 3.
Smart Tiers 85