HP XP P9500 Storage - Manual (Page 153)

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If a Cnt Ac-J pair is suspended when the Cnt Ac-S S-VOL is in PAIR or COPY status, the Cnt
Ac-S pair becomes suspended by error.
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A Cnt Ac-J pair cannot be released if cascaded with a Cnt Ac-S pair. To release a Cnt Ac-J
pair, first release the Cnt Ac-S pair, then release the Cnt Ac-J pair.
Specifications and restrictions for Continuous Access Synchronous pair operations
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Specify a volume for the Cnt Ac-S P-VOL that is not used in a Cnt Ac-J pair In the 2DC
configuration, use the journal that was registered when 2DC Cascade was enabled.
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The Cnt Ac-J P-VOL that is specified for the Cnt Ac-S S-VOL must be in PAIR status. The only
available differential management unit is tracks.
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To re-synchronize the Cnt Ac-S pair, the Cnt Ac-J P-VOL must be in PAIR status.
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You cannot use the takeover command on the Cnt Ac-S S-VOL when suspending the Cnt Ac-S
pair.
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If you release the Cnt Ac-S pair when the Cnt Ac-J P-VOL is in COPY status, the Cnt Ac-J pair
becomes suspended by error.
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For Cnt Ac-J, an X at the end of the device ID indicates the LDEV is a Thin Provisioning virtual
volume. However, the X does not display when both of the following conditions exist:
◦ The Cnt Ac-S S-VOL is a Thin Provisioning virtual volume.
◦ The Cnt Ac-J S-VOL is not a Thin Provisioning virtual volume.
Procedure for a 2DC configuration
Procedure 43 To set up a 2DC configuration
1. Install and set up Cnt Ac-S and Cnt Ac-J on the required systems.
2. When registering the journal on the intermediate site, set 2DC Cascade to Enable in the Edit
Journal Volumes dialog box.
3. Create the Cnt Ac-J pair on the intermediate system.
4. When Cnt Ac-J pair status is PAIR, create the Cnt Ac-S pair on the primary system. See HP
P9000 Continuous Access Synchronous User Guide.
5. Confirm that Cnt Ac-S pair status becomes PAIR.
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