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

Table 59 Comparison of copying processes (continued)
HP Compatible FlashCopyIBM FlashCopyCompared item
Data can be copied from the Compatible FlashCopy
relationship S-VOL to T-VOL but not to the Cnt Ac-J Z
-Establishing a Cnt Ac-J Z pair in
NOCOPY mode whose P-VOL
S-VOL. In this state if you release the Compatibleis a Compatible FlashCopy
FlashCopy relationship, the data of Cnt Ac-J Z P-VOL
and S-VOL will be different.
relationship T-VOL that you
establish in NOCOPY mode
Neither local or remote relationships are created.The relationship on the remote site is not
created, though the local relationship
The operation used when
relationship-creation fails in the
may be created. In this case, the Cntremote site for Preserve Mirror
FlashCopy Ac-S Z volume associated with the
Compatible FlashCopy T-VOL is in
suspend status.
Comparison of processing in releasing relationships
The following table compares the relationship releasing processes of IBM FlashCopy and HP
Compatible FlashCopy.
Table 60 Differences of relationship releasing process between IBM FlashCopy and HP Compatible FlashCopy
HP Compatible FlashCopyIBM FlashCopyCompared item
When a part of the existing relationship area is
included in the extent area specified by the
The command deletes the
relationships existing within the
specified extent area.
Withdraw command (specifies extent
area).
See the following figure.
Withdraw command, the existing relationship is
not released but remains the same, except for some
When the specified extent area is
included only in a part of the central
exceptional cases. If you specify DDSW(YES) or if
the range specified with SDEVN contains at least
existing relationship area, only the
part of the relationship source, the relationship is
released after background copy is performed.
existing relationships of the area will
be divided up.
Not supported. The command will finish
abnormally. Relationships will not be deleted.
The command will finish normally.
Relationships will not be deleted.
REMOVEFCPY (ICKDSF CONTROL
command)
Part of the volume relationship is
withdrawn.
The operation for establishing a
dataset relationship using DFSMSdss
• When you specify the source volume of a
volume relationship as the copy target, the entire
volume relationship will be withdrawn.
command, and specifying the source
or target volume of a volume
relationship as the copy target
• When you specify the target volume of a volume
relationship as the copy target, the volume
relationship will be withdrawn.
Comparison of processing in releasing relationships 105