GAD operations and Thin Image pair status
The ability to perform a GAD pair operation depends on the GAD pair status
and the HTI pair status. The following tables show GAD operations and
whether they can be performed (Yes, No) with the listed HTI status. The
information assumes the required GAD status for the operation.
Table 2-13 GAD operations and HTI pair status, when the GAD P-VOL is shared
TI pair
status
GAD pair operations
Create
GAD
Pairs
Suspend Pairs Delete Pairs Resync Pairs
P-VOL
selected
S-VOL
selected
P-VOL
selected
1
S-VOL
selected
2
Forced
deletion
P-VOL
selected
S-VOL
selected
SMPL(PD) Yes Yes Yes Yes
No
3
Yes Yes Yes
COPY Yes Yes Yes Yes
No
3
Yes Yes Yes
PAIR Yes Yes Yes Yes
No
3
Yes Yes Yes
PSUS Yes Yes Yes Yes
No
3
Yes Yes Yes
COPY(RS-
R)
No
4
impossible impossible Yes
No
3
Yes
No
4
No
4
PSUE Yes Yes Yes Yes
No
3
Yes Yes Yes
Notes:
1. You can delete a GAD pair by specifying the P-VOL, only when the I/O mode is Local and the GAD
pair status of the P-VOL is PSUS or PSUE.
2. You can delete a GAD pair by specifying the S-VOL, only when the I/O mode is Local and the GAD
pair status of the S-VOL is SSWS.
3. Cannot be used because, when you delete a GAD pair specifying the S-VOL, the P-VOL's virtual LDEV
ID is also deleted, which makes it unusable as the HTI P-VOL.
4. To continue resynchronizing the HTI pair, you must split the GAD pair.
Table 2-14 GAD operations and HTI pair status, when the GAD S-VOL is shared
TI pair
status
GAD pair operations
Create
GAD
Pairs
Suspend Pairs Delete Pairs Resync Pairs
P-VOL
selected
S-VOL
selected
P-VOL
selected
1
S-VOL
selected
2
Forced
deletion
P-VOL
selected
S-VOL
selected
SMPL(PD)
No
3
Yes Yes
No
4
Yes Yes Yes Yes
COPY
No
3
Yes Yes
No
4
Yes Yes Yes Yes
PAIR
No
3
Yes Yes
No
4
Yes Yes Yes Yes
PSUS
No
3
Yes Yes
No
4
Yes Yes Yes Yes
COPY(RS-
R)
No
3, 5
No No
No
4
Yes Yes
No
5, 6
No
6
PSUE
No
3
Yes Yes
No
4
Yes Yes Yes Yes
2-16
System requirements
Hitachi Virtual Storage Platform G1000 Global-Active Device User Guide
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