Thin Image operations and global-active device status

Ops Center High Availability User Guide
Version
10.9.x
File Size
3.9 MB
Audience
anonymous
Part Number
MK-99ADM003-14

The ability to perform a Thin Image pair operation depends on the HTI pair status and the GAD pair status.

The following tables show HTI operations and whether they can be performed (Yes, No) with the listed GAD status. The information assumes the required HTI status for the operation.

The Virtual LDEV ID column shows whether the volume has a virtual LDEV ID or not (Yes, No).

Table. Thin Image operations when GAD status is Simplex
GAD pair status Virtual LDEV ID I/O Thin Image pair operation
Read Write Create pairs Split pairs Resync pairs Restore pairs Delete pairs
SMPL Yes Yes Yes Yes Yes Yes Yes Yes
No No No Yes Yes Yes Yes Yes
No, but the GAD reserve attribute is set No No No No No No Yes
Table. Thin Image operations when GAD status is Mirroring
GAD pair status I/O mode Pair location I/O Thin Image pair operation
Read Write Create pairs Split pairs Resync pairs Restore pairs Delete pairs

INIT/COPY

Mirror (RL)

Primary

Yes

Yes

Yes

Yes

Yes

No1

Yes

Block

Secondary No No No No2 No2 No1, 3 Yes
COPY Mirror (RL) Primary Yes Yes Yes Yes Yes No1 Yes
Block Secondary No No No No2 No2 No1, 3 Yes

Notes:

  1. Cannot be used because GAD pairs are not suspended.
  2. Cannot be used because the data is being copied and the volume data is not fixed yet.
  3. Cannot be used because the volume at the GAD copy destination is the same as the volume at the Thin Image copy destination.
Table. Thin Image operations when GAD status is Mirrored
GAD pair status I/O mode Pair location I/O Thin Image pair operation
Read Write Create pairs Split pairs Resync pairs Restore pairs Delete pairs
PAIR Mirror (RL) Primary Yes Yes Yes Yes Yes No* Yes
Secondary Yes Yes Yes Yes Yes No* Yes

* Cannot be used because GAD pairs are not suspended, and also because the volume at the GAD copy destination is the same as the volume at the Thin Image copy destination.

Table. Thin Image operations when no volume is set for the quorum disk or GAD status of GAD pairs
GAD pair status I/O mode Pair location I/O Thin Image pair operation
Read Write Create pairs Split pairs Resync pairs Restore pairs Delete pairs/Suspend copy
PAIR Mirror(RL) Primary Yes Yes Yes Yes Yes No* Yes
Mirror(RL) Secondary Yes Yes Yes Yes Yes No* Yes

* Cannot be used because GAD pairs are not suspended, and also because the volume at the GAD copy destination is the same as the volume at the Thin Image copy destination.

Table. Thin Image operations when GAD status is Suspended
GAD pair status I/O mode Pair location I/O Thin Image pair operation
Read Write Create pairs Split pairs Resync pairs Restore pairs Delete pairs
PSUS Local Primary Yes Yes Yes Yes Yes Yes Yes
Block Primary No No Yes Yes Yes No Yes
PSUE Local Primary Yes Yes Yes Yes Yes Yes Yes
Block Primary No No Yes Yes Yes No Yes
Secondary No No Yes Yes Yes No Yes
SSUS Block Secondary No No Yes Yes Yes No Yes
SSWS Local Secondary Yes Yes Yes Yes Yes No Yes
Table. Thin Image operations when GAD status is Blocked
GAD pair status I/O mode Pair location I/O Thin Image pair operation
Read Write Create pairs Split pairs Resync pairs Restore pairs

Delete pairs

PSUE Block Primary No No Yes Yes Yes No Yes
Secondary No No Yes Yes Yes No Yes