Hitachi ShadowImage for IBM z/OS User"s Guide (T5213-96002, June 2007)

About ShadowImage™ for IBM
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z/OS
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Operations 2-27
Hitachi ShadowImage™ for IBM
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z/OS
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User’s Guide
– Query the SIz S-VOL and T-VOL status from the host if the SIz S-VOL
and URz P-VOL share the same volume,
– Query the SIz T-VOL status from the host if the SIz S-VOL and URz
S-VOL share the same volume.
– Query the SIz S-VOL status from the host if the SIz T-VOL and URz
P-VOL share the same volume.
Note: ShadowImage for z/OS supports multiple T-VOLs for each S-VOL. If
you issue a pair status query to an SIz S-VOL, the status for only one SIz
pair is reported (the pair with the T-VOL with the lowest LDEV ID). To
obtain the pair status for the SIz pair(s) with the other T-VOL(s), you must
direct the host query to the specific T-VOL using the T-VOL’s LDEV ID in
the host command. The SIz remote console software displays the LDEV ID
and SIz pair status of all T-VOLs associated with an S-VOL.
When you perform PPRC command to the SIz/URz shared volumes to query
the pair status, the storage system reports pair status of the SIz. To query
pair status of the URz from the host, use Business Continuity Manager. For
details regarding how to use Business Continuity Manager, see the Business
Continuity Manager User and Reference Guide.
The following table lists the currency of the data on shared SIz/URz volumes
based on the SIz and URz pair status.
Table 2-6 Currency of a Shared SIz and URz Volume
URz Pair Status
SIz Pair Status Pending duplex Duplex Suspended
Pending Not current Not current Not current
Duplex Not current Not current CURRENT
SP-Pending Not current Not current CURRENT
V-Split Not current Not current CURRENT
Split CURRENT CURRENT CURRENT
Resync Not current Not current CURRENT
Resync-r - - CURRENT
Suspended Not current Not current Not current
The configuration shown in Figure 2-14 is an example of a volume, which is
functioning as both an SIz S-VOL and a URz P-VOL. This configuration allows
you to:
• Use ShadowImage for z/OS to provide on-site backup copies of URz
P-VOLs, and/or
• Use URz to provide remote backup copies of SIz S-VOLs.