Assignment Tier When Pool-Vols Are Deleted - HP XP7 User Manual

If V-VOL is given priority for relocation:
For example, if LDEVs of LDEV IDs with LDEV#3 and LDEV#4 are set priority for relocation
from LDEV#1 to LDEV#5, LDEVs are relocated with the following sequences. In this example,
three LDEVs are relocated in each period, but the number of LDEVs to relocate may change
by the relocation cycle or data size.
Relocating cycle
T1
T2
T3
T4

Assignment tier when pool-VOLs are deleted

When you delete pool-VOLs, the pages allocated to the pool-VOLs are moved to other pool-VOLs.
The following table shows the tier numbers to which pages are allocated before and after pool-VOLs
are deleted. This operation does not depend on the tiering policy or the settings of newly assigned
tiers. Relocate tiers after deleting pool-VOLs.
The following table describes page allocation in a 3-tier configuration.
Tier of deleted pool-VOLs
Tier 1
Tier 2
Tier 3
The following table describes page allocation in a 2-tier configuration.
Tier of deleted pool-VOLs
Tier 1
108 Configuring thin provisioning
Relocating Relocating
sequence of sequence of
LDEV#1 in each LDEV#2 in each
cycle cycle
3rd Unperformed
Unperformed 3rd
Unperformed Unperformed
3rd Unperformed
Order in which pages are
allocated to tiers
Tier 1, Tier 2, and Tier 3
Tier 2, Tier 1, and Tier 3
Tier 3, Tier 2, and Tier 1
Order in which pages are
allocated to tiers
Tier 1 and Tier 2
Relocating Relocating
sequence of sequence of
LDEV#3 in each LDEV#4 in each
cycle cycle
1st 2nd
1st 2nd
1st 2nd
1st 2nd
Description
If there is free space in Tier 1, pages are
allocated to Tier 1.
If there is no free space in Tier 1, pages are
allocated to Tier 2.
If there is no free space in Tier 1 and Tier 2,
pages are allocated to Tier 3.
If there is free space in Tier 2, the pages are
allocated to Tier 2.
If there is no free space in Tier 2, pages are
allocated to Tier 1.
If there is no free space in Tier 1 and Tier 2,
pages are allocated to Tier 3.
If there is free space in Tier 3, pages are
allocated to Tier 3.
If there is no free space in Tier 3, pages are
allocated to Tier 2.
If there is no free space in Tier 2 and Tier 3,
pages are allocated to Tier 1.
Description
If there is free space in Tier 1, pages are
allocated to Tier 1.
Relocating
sequence of
LDEV#5 in each
cycle
Unperformed
Unperformed
3rd
Unperformed