Sharing
Thin Image volumes with
ShadowImage
You can share Thin Image (HTI) P-VOLs with ShadowImage (SI) P-VOL and S-VOLs.
Available Thin Image tasks
The following table lists the Thin Image tasks you can perform when sharing a Thin Image P-VOL with a ShadowImage P-VOL.
|
HTI task |
SI pair status | |||||||
|
COPY(PD)/COPY |
PAIR |
COPY(SP)/COPY |
PSUS(SP)/PSUS |
PSUS |
COPY(RS)/COPY |
COPY(RS-R)/RCPY |
PSUE | |
|
Create pair |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
No |
Yes |
|
Store snapshot data |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
No |
Yes |
|
Restore pair |
No |
No |
No |
No |
Yes |
No |
No |
Yes |
|
Delete snapshot data |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
|
Release pair |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
|
Legend:
| ||||||||
The following table lists the Thin Image tasks you can perform when sharing a Thin Image P-VOL with a ShadowImage S-VOL.
|
HTI task |
SI pair status | |||||||
|
COPY(PD)/COPY |
PAIR |
COPY(SP)/COPY |
PSUS(SP)/PSUS |
PSUS |
COPY(RS)/COPY |
COPY(RS-R)/RCPY |
PSUE | |
|
Create pair |
No |
No |
No |
No |
Yes |
No |
No |
No |
|
Store snapshot data |
N/A |
No |
No |
No |
Yes |
No |
No |
No |
|
Store snapshot data for a consistency group |
N/A |
No |
No |
No |
Yes* |
No |
No |
No |
|
Restore pair |
N/A |
No |
No |
No |
Yes |
No |
No |
No |
|
Delete snapshot data |
N/A |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
|
Release pair |
N/A |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
|
* The SI pair status must be "PSUS" during the period between when you create the HTI pair to store snapshot data and when HTI starts to store snapshot data for a consistency group, and when all of the pairs in the consistency group are split ("PSUS" status). If the SI pair status changes to a status other than "PSUS" while HTI is storing snapshot data for the consistency group, the snapshot data consistency cannot be guaranteed. Legend:
| ||||||||
Available ShadowImage tasks
The following table lists the ShadowImage tasks you can perform when sharing a Thin Image P-VOL with a ShadowImage P-VOL.
|
SI task |
HTI pair status | |||||
|
COPY |
PAIR, PFUL |
PSUS, PFUS |
SMPL(PD) |
RCPY |
PSUE | |
|
Create pair |
Yes |
Yes |
Yes |
Yes |
No |
Yes |
|
Create and split pair |
Yes |
Yes |
Yes |
Yes |
No |
Yes |
|
Split pair |
Yes |
Yes |
Yes |
Yes |
No |
Yes |
|
Normal Copy |
Yes |
Yes |
Yes |
Yes |
No |
Yes |
|
Reverse Copy |
Yes |
Yes |
Yes |
Yes |
No |
Yes |
|
Quick Restore |
No |
No |
No |
No |
No |
No |
|
Suspend replication |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
|
Delete pair |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
|
Legend:
| ||||||
The following table lists the ShadowImage tasks you can perform when sharing a Thin Image P-VOL with a ShadowImage S-VOL.
|
SI task |
HTI pair status | |||||
|
COPY |
PAIR, PFUL |
PSUS, PFUS |
SMPL(PD) |
RCPY |
PSUE | |
|
Create pair |
No |
No |
No |
No |
No |
No |
|
Create and split pair |
No |
No |
No |
No |
No |
No |
|
Split pair |
Yes |
Yes |
Yes |
Yes |
No |
Yes |
|
Normal Copy |
Yes |
Yes |
Yes |
Yes |
No |
Yes |
|
Reverse Copy |
Yes |
Yes |
Yes |
Yes |
No |
Yes |
|
Quick Restore |
No |
No |
No |
No |
No |
No |
|
Suspend replication |
Yes |
Yes |
Yes |
Yes |
No |
Yes |
|
Delete pair |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
|
Legend:
| ||||||
You can perform ShadowImage pair tasks after you store snapshot data, but the consistency of the stored snapshot data is not guaranteed.
Thin Image S-VOLs use the data in the P-VOL. You cannot Quick Restore in ShadowImage.
For more information about ShadowImage tasks and pair statuses, see the ShadowImage User Guide.
To share Thin Image volumes with ShadowImage if Thin Image is using the MU numbers 0 to 2:
- Delete the Thin Image pair of the MU number 0 to 2.
- Create the ShadowImage pairs and Thin Image pairs.