Sharing Thin Image volumes that have Data Retention Utility access attributes

Thin Image User Guide

Version
9.8.6
Audience
anonymous
Part Number
MK-98RD9020-16

You can create Thin Image (HTI) pairs using volumes on which you set Data Retention Utility access attributes. In addition, you can set any access attribute for virtual volumes of HTI.

Depending on access attributes of the P-VOL, S-VOL, or pool volume, you cannot perform some pair tasks and pool tasks with Thin Image. The Thin Image pair tasks you can perform are different depending on whether you assign Data Retention Utility access attributes using CCI or HDvM - SN. The tables below explain whether you can perform Thin Image pair tasks and pool tasks on volumes that have access attributes assigned by Data Retention Utility. If you release assignment of snapshot data after assigning access attributes to a Thin Image S-VOL, the Thin Image tasks you can perform are the same as those that can be performed when the Read/Write attribute is assigned to the S-VOL.

Also, you can assign access attributes to Thin Image P-VOL and S-VOLs. The tables below also explain Thin Image pair tasks and pool tasks after access attributes are assigned.

Access attributes and supported Thin Image pair tasks

The following table lists the relationship between P-VOL and S-VOL access attributes and Thin Image pair tasks when using HDvM - SN to assign Data Retention Utility access attributes.

Volume access attributes specified for the HTI pair

HTI pair task

P-VOL

S-VOL

Create, split, suspend, Resync pair (Normal Copy)

Resync (Reverse Copy)1

Delete

Read/Write

Read/Write

Yes

Read Only, Protect, S-VOL Disable

No

Read Only, Protect, S-VOL Disable

Read/Write

Yes

No

Yes

Read Only, Protect, S-VOL Disable

No

  1. Reverse Copy does not copy S-VOL access attributes to P-VOLs (see Pair resynchronization methods).

The following table lists the relationship between P-VOL and S-VOL access attributes and Thin Image pair tasks when using CCI to assign Data Retention Utility access attributes.

Volume access attributes specified for the HTI pair

HTI pair task

P-VOL

S-VOL

Create, split, suspend, Resync pair (Normal Copy)

Resync (Reverse Copy)1

Delete

Read/Write, Read Only, Protect

Read/Write, Read Only, Protect

Yes

S-VOL Disable

No

S-VOL Disable

Read/Write, Read Only, Protect

Yes

No

Yes

S-VOL Disable

No

  1. Reverse Copy does not copy S-VOL access attributes to P-VOLs (see Pair resynchronization methods).

Access attributes and supported Thin Image pool tasks

The following table lists the relationship between P-VOL and S-VOL access attributes specified by Thin Image and Thin Image pool tasks when using CCI or HDvM - SN to assign Data Retention Utility access attributes.

Volume access attributes specified by HTI

Pool-VOL setting

Read/Write

Yes

Read Only

No

Protect

No

S-VOL Disable

No

Note: Performing a Thin Image task does not change the volume access attributes.

Required Thin Image pair status when using Data Retention Utility to assign access attributes to some volumes

The following table shows the Thin Image pair status that is required to use Data Retention Utility to assign access attributes to some Thin Image P-VOLs and S-VOLs when also using HDvM - SN to assign Data Retention Utility access attributes.

HTI volume

Access attribute to be assigned

Pair status

Volume

Read/Write

Read Only

Protect

S-VOL Disable

COPY

P-VOL

Yes

Yes

S-VOL

Yes

No

PAIR, PFUL

P-VOL

Yes

Yes

S-VOL

Yes

Yes

PSUS, PFUS

P-VOL

Yes

Yes

S-VOL

Yes

Yes

SMPL(PD)

P-VOL

Yes

Yes

S-VOL

Yes

No

RCPY

P-VOL

Yes

No

S-VOL

Yes

No

PSUE

P-VOL

Yes

Yes

S-VOL

Yes

No

The following table shows the Thin Image pair status that is required to use Data Retention Utility to assign access attributes to some Thin Image P-VOLs and S-VOLs when also using CCI to assign Data Retention Utility access attributes.

HTI volume

Access attribute to be assigned

Pair status

Volume

Read/Write

Read Only

Protect

S-VOL Disable

COPY

P-VOL

Yes

Yes

S-VOL

Yes

No

PAIR, PFUL

P-VOL

Yes

Yes

S-VOL

Yes

Yes

PSUS, PFUS

P-VOL

Yes

Yes

S-VOL

Yes

Yes

SMPL(PD)

P-VOL

Yes

Yes

S-VOL

Yes

No

RCPY

P-VOL

Yes

No

S-VOL

Yes

No

PSUE

P-VOL

Yes

Yes

S-VOL

Yes

No