Thin Image operations and global-active device status

Ops Center High Availability User Guide

Version

10.8.x

File Size

3.9 MB

Audience

anonymous

Part Number

MK-99ADM003-10

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
GAD pair status	Virtual LDEV ID	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
GAD pair status	I/O mode	Pair location	Read	Write	Create pairs	Split pairs	Resync pairs	Restore pairs	Delete pairs
INIT/COPY	Mirror (RL)	Primary	Yes	Yes	Yes	Yes	Yes	No¹	Yes
INIT/COPY	Block	Secondary	No	No	No	No²	No²	No^{1, 3}	Yes
COPY	Mirror (RL)	Primary	Yes	Yes	Yes	Yes	Yes	No¹	Yes
COPY	Block	Secondary	No	No	No	No²	No²	No^{1, 3}	Yes
Notes: Cannot be used because GAD pairs are not suspended. Cannot be used because the data is being copied and the volume data is not fixed yet. 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
GAD pair status	I/O mode	Pair location	Read	Write	Create pairs	Split pairs	Resync pairs	Restore pairs	Delete pairs
PAIR	Mirror (RL)	Primary	Yes	Yes	Yes	Yes	Yes	No*	Yes
PAIR	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 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
GAD pair status	I/O mode	Pair location	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
PAIR	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
GAD pair status	I/O mode	Pair location	Read	Write	Create pairs	Split pairs	Resync pairs	Restore pairs	Delete pairs
PSUS	Local	Primary	Yes	Yes	Yes	Yes	Yes	Yes	Yes
PSUS	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
	Block	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
GAD pair status	I/O mode	Pair location	Read	Write	Create pairs	Split pairs	Resync pairs	Restore pairs	Delete pairs
PSUE	Block	Primary	No	No	Yes	Yes	Yes	No	Yes
PSUE	Block	Secondary	No	No	Yes	Yes	Yes	No	Yes