HP XP Business Copy Software - Manual (Page 169)

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3 Sharing T-VOL with
other copy solutions
Pairs that include the following shared
volume can be created:
• PPRC pair that includes a volume
used as FlashCopy S-VOL as well
as PPRC T-VOL
• PPRC pair that includes a volume
used as FlashCopy T-VOL as well as
PPRC S-VOL
• PPRC pair that includes a volume
used as FlashCopy T-VOL as well as
PPRC T-VOL
Not supported.
Message “ANTF0353E” appears.
4 Number of multiple
relationships
Up to 12 pairs can be created per
extent (the smallest unit: track).
Up to 16 pairs can be created per
extent (the smallest unit: track).
5 Maximum number of
pairs that can be
created per volume
951 pairs (for 3390-3)
2,719 pairs (for 3390-9 when the
number of available cylinders are
10,017)
7,615 pairs (for 3390-L when the
number of available cylinders are
28,356)
8,839 pairs (for 3390-L when the
number of available cylinders are
32,760)
1,000 pairs (for all volume types)
6 FCWITHDR command
(DDSW = YES,
XTNTLST parameter
specified)
The command withdraws the copy
targets of pairs existing within the
extents specified as the source,
provided that:
• When the copy target of the
pair is only partly included in
the specified extent, only the
area that is included in the
extent is withdrawn.
• When only the central part of
the copy target of the pair is
included in the specified extent,
only the area that is included is
withdrawn. The remaining area
of the pair is divided up.
The command withdraws the copy
targets of pairs existing within the entire
extents specified as the source. When
the copy target of the pair is only partly
included in the specified extent, the
command does not withdraw the pair.
CAUTION: If one of the following
has been performed, creation of
relationships may fail:
• A scratch operation
• Deletion of datasets
• Volume initialization
Therefore, if any of these has been
performed, please do either of the
following:
• Use the FCWITHDR command
to withdraw the relationship.
• Wait until the background copy
operation finishes and the
relationship disappears.
Table 78 Differences Between IBM FlashCopy and Compatible Mirroring for IBM FlashCopy Version 2
No. Compared item IBM FlashCopy FlashCopy Mirror Version 2