Hitachi TrueCopy for IBM z/OS User and Reference Guide (T5211-96001, June 2007)

7-10 TrueCopy for z/OS Usage Scenarios
Hitachi Universal Storage Platform V TrueCopy for IBM z/OS User’s Guide
Analyzing the Currency of TrueCopy for z/OS Sync R-VOLs
Table 7-2 shows how to determine the currency of a TCz Synchronous R-VOL
based on its pair status and M-VOL fence level setting. For TCz Synchronous
pairs with an M-VOL fence level setting of Never, further analysis will be
required to determine the currency of these R-VOLs. The currency of these R-
VOLs can be determined by using the sense information transferred via the
ERC or by comparing the contents of the R-VOL with other files which are
confirmed to be current (e.g., DB2 log files). These R-VOLs should be
recovered using the files which are confirmed to be current.
Table 7-2 Analyzing the Currency of TrueCopy for z/OS Sync R-VOLs
Status of R-VOL Fence Level Currency of R-VOL
Simplex
Data
Status
Never
Inconsistent. This R-VOL does not belong to a TCz pair. (Note: Even if
you established a TCz pair for this volume, you must regard this volume
as inconsistent.)
Pending Duplex
Data
Status
Never
Inconsistent. This R-VOL is not synchronized because not all tracks
have been copied from the M-VOL yet. This R-VOL must be initialized (or
copied from the M-VOL at a later time).
Duplex
Data
Status
Current. This R-VOL is synchronized with its M-VOL.
Never
Needs to be analyzed. This R-VOL requires further analysis to
determine its level of currency.
Suspended -
initial copy failed
Data
Status
Never
Inconsistent. This R-VOL is not synchronized because not all tracks
have been copied from the M-VOL yet. This R-VOL must be initialized (or
copied from the M-VOL at a later time).
Suspended -
R-VOL by operator
Data
Status
Never
Suspect. This R-VOL is not synchronized with its M-VOL if any write I/Os
were issued to the M-VOL after the pair was suspended. This pair should
be restarted using the Entire Volume initial copy option, but the None
option can be used if you are sure no data on the M-VOL changed.
Suspended -
all other types
Data Current. This R-VOL is synchronized with its M-VOL.
Status
Never
Suspect. This R-VOL is not synchronized with its M-VOL if any write I/Os
were issued to the M-VOL after the pair was suspended. Restore the
consistency of this R-VOL and update it, if required. The system time
stamp information transferred through ERC or the time of suspension
indicated on the Detailed Information dialog box will help to determine
the last time this R-VOL was updated.