HP XP7 Storage - Manual (Page 98)

example, three LDEVs are relocated in each period, but the number of LDEVs to relocate may
change by the relocation cycle or the data size.
Relocating
sequence of
LDEV#5 in each
cycle Relocating
sequence of
LDEV#4 in each
cycle Relocating
sequence of
LDEV#3 in each
cycle Relocating
sequence of
LDEV#2 in each
cycle Relocating
sequence of
LDEV#1 in each
cycle Relocating cycle
Unperformed Unperformed 3rd 2nd 1st T1
2nd 1st Unperformed Unperformed 3rd T2
Unperformed 3rd 2nd 1st Unperformed T3
1st Unperformed Unperformed 3rd 2nd T4
•
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
sequence of
LDEV#5 in each
cycle Relocating
sequence of
LDEV#4 in each
cycle Relocating
sequence of
LDEV#3 in each
cycle Relocating
sequence of
LDEV#2 in each
cycle Relocating
sequence of
LDEV#1 in each
cycle Relocating cycle
Unperformed 2nd 1st Unperformed 3rd T1
Unperformed 2nd 1st 3rd Unperformed T2
3rd 2nd 1st Unperformed Unperformed T3
Unperformed 2nd 1st Unperformed 3rd 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.
Description Order in which pages are
allocated to tiers Tier of deleted pool-VOLs
If there is free space in Tier 1, pages are
allocated to Tier 1. Tier 1, Tier 2, and Tier 3 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. Tier 2, Tier 1, and Tier 3 Tier 2
If there is no free space in Tier 2, pages are
allocated to Tier 1.
98 Configuring thin provisioning