HP XP Business Copy Software - Manual (Page 165)

ShadowImage for z/OS user guide 165
NOTE: If the status of only a part of the pairs in the same consistency group is changed, the processing of
At-Time Split function may not resume when you switch on the power supply, and the status of some pairs
may remain unchanged.
CAUTION: If data on the shared memory is volatilized and lost after the power turns on, problems
may occur during operations. To avoid possible problems, withdraw as much relationships as
possible before powering off the disk array.
Suspending FlashCopy Mirror Version 2 Pairs
FlashCopy Mirror Version 2 pairs may be suspended if a hardware or software failure occurs during
FlashCopy Mirror Version 2 operation. If FlashCopy Mirror Version 2 pairs are suspended, hosts may be
unable to access copy target datasets.
To find whether suspended FlashCopy Mirror Version 2 pairs exist within the volumes, use the
ShadowImage z/OS main panel. If the Relation(s) column of the volume list displays S-Failed or T-Failed,
a suspended FlashCopy Mirror Version 2 pair exists within the volume.
To delete a suspended FlashCopy Mirror Version 2 pair, do one of the following:
• Delete the copy target dataset that have the suspended FlashCopy Mirror Version 2 pair (i.e., the
dataset that is inaccessible from hosts). The operating system will automatically recognize the pair that
has the dataset to be deleted, and will issue the Withdraw command.
• Issue the TSO FCWITHDR command. If the suspended FlashCopy Mirror Version 2 pair can be
identified, please issue the FCWITHDR command to its extent. For detailed information about the
FCWITHDR command, see ” Withdrawing FlashCopy Mirror Version 2 Pairs: FCWITHDR ” on
page 137.
Relationship Btw. Comp. Mirror. for IBM FlashCpy. and Comp. Mirror. for IBM
FlashCpy. Ver. 2
Table 77 Differences Between FlashCopy Mirror and FlashCopy Mirror Version 2
No. Compared item FlashCopy Mirror FlashCopy Mirror Version 2
1 Required software and
memory
ShadowImage for z/OS software
FlashCopy Mirror software ShadowImage for z/OS software
FlashCopy Mirror Version 2 software
Additional shared memory may also
be necessary.
2 Requirement on the
capacity of the S-VOL
and T-VOL for volume
copy operation
S-VOL = T-VOL S-VOL = T-VOL
3 S-VOL/T-VOL LSS Can create pairs with only volumes in
the same LSS.
Can create pairs with volumes in the
same LSS or different LSS.
4 Range of extents Can create pairs with the entire source
and target volumes, or with the copy
source and target extents that located
at the same position on the source and
target volumes.
Can create pairs with the entire source
and target volumes, or with the copy
source and target extents located at the
same or different position on the source
and target volumes.
5 Unit used for pair
management
Pairs are managed by volume. Even
when multiple datasets on the same
volume are specified, the number of
pair is regarded as 1.
Pairs are managed by the specified
extents, or by volume when the entire
volume is specified. When multiple
datasets are specified on the same
volume, each dataset is regarded as a
pair.