HP XP7 for Compatible FlashCopy Mirroring User Guide (TK940-96001)

Note: Creation of relationships can fail if any of the following has been performed:
• A scratch operation
• Deletion of datasets
• Volume initialization
Correct the situation by using the FCWITHDR command to withdraw the relationship, or by waiting
until the background copy operation completes and the relationship disappears. For details about
scratch operations, see the IBM manual.
Comparing IBM FlashCopy SE and Compatible FlashCopy SE
The following table compares IBM FlashCopy SE and Compatible FlashCopy SE.
Table 61 Comparing IBM FlashCopy SE and Compatible FlashCopy SE
Compatible FlashCopy SEIBM FlashCopy SEItem
The usage amount in the pool is managed in units of
pages, and the usage amount of the TSE-VOL in the page
Since usage amount in the pool is
managed in units of tracks, you cannot
write to the pool when the pool is full.
Action when the
pool is full
is managed in units of tracks. When pages cannot be
allocated because the pool is full, you can write to the
pool until all tracks in the page are used.
After you change the T-VOL status of a Compatible
FlashCopy SE relationship to online and then change it
After you change the T-VOL status of a
FlashCopy relationship to online and
Changing volumes
to online
to offline and execute Fast Reverse Restore, you cannotthen change it to offline and execute Fast
change the new S-VOL status to online because the data
is not guaranteed.
Reverse Restore, you can change the
new S-VOL status to online.
Comparison of supporting commands
IBM FlashCopy supports the ICKDSF commands while Compatible FlashCopy partly supports them.
However, if you execute the commands to a Cnt Ac-S Z P-VOL or BC Z S-VOL that is in pending
status, the commands will end abnormally with CC=12. See (page 108) for details on how to avoid
the abnormal ending.
In addition, Compatible FlashCopy does not support the following parameters of the TSO commands:
106 Feature comparison with IBM product