Hitachi AMS 2000 User Manual page 68

Table 4-2: Combination of a DP-VOL for Data Pool and a Normal
P-VOL Data
Pool
DP-VOL
DP-VOL
Normal LU
When creating a TCE pair using the DP-VOLs, in the P-VOL, the S-VOL
or the data pool specified at the time of the TCE pair creation, the DP-
VOLs whose Full Capacity Mode is enabled and disabled cannot be
mixed.
When creating the data pool using multiple DP-VOLs, the data pool
cannot be created by combining the DP-VOLs that have different setting
of Enabled/Disabled for Full Capacity Mode.
• Assigning the controlled processor core of a P-VOL and a data pool that
uses the DP-VOL
When the controlled processor core of the DP-VOL used for a P-VOL (S-
VOL) or used for a data pool of TCE differs as well as the normal LU,
switch the P-VOL (S-VOL) controlled processor core assignment to the
data pool controlled processor core automatically and create a pair. (In
case of AMS2500)
• DP pool designation of a P-VOL (S-VOL) and a data pool which uses the
DP-VOL
When using the DP-VOL created by Dynamic Provisioning for a P-VOL (S-
VOL) or a data pool of TCE, using the DP-VOL designated in separate DP
pool of a P-VOL (S-VOL) and a data pool is recommended considering
the performance.
• Setting the capacity when placing the DP-VOL in the data pool
When the pair status is Split, the old data is copied to the data pool while
writing to the P-VOL. When using the DP-VOL created by Dynamic
Provisioning as the data pool of TCE, the consumed capacity of the DP-
VOL in the data pool is increased by storing the old data in the data pool.
If the DP-VOL of more than or equal to the DP pool capacity is created
and used for the data pool, this processing may deplete the DP pool
capacity. When using the DP-VOL for the data pool of TCE, it is
recommended to set the capacity making the over provisioning ratio
100% or less so that the DP pool capacity does not deplete.
4–12
Hitachi AMS 2000 Family TrueCopy Extended Distance User Guide
DP-VOL
Normal LU
DP-VOL
Plan and design—arrays, volumes and operating systems
LU
Available. The data pool consumed capacity can
be reduced compared to the normal LU on both
local side and remote side.
Available. The data pool consumed capacity can
be reduced compared to the normal LU on local
side.
Available. The data pool consumed capacity can
be reduced compared to the normal LU on remote
side.