HP StorageWorks XP Remote Web Console Software - Manual (Page 127)

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Differences Between IBM FlashCopy and Compatible Mirroring for IBM FlashCopy
Version 2
Table 60 Differences Between IBM FlashCopy and Compatible Mirroring for IBM FlashCopy Version 2
No. Compared item IBM FlashCopy FlashCopy Mirror Version 2
1 Read access to the
area not specified as
the copy range in the
copy target in
NOCOPY mode
The data on the tracks subject to read
operation are not copied from the copy
source to the copy target.
The data on the tracks subject to read
operation are copied from the copy
source to the copy target.
2 Status of the pairs
when On-demand
copy is processed
Pairs are withdrawn automatically
when all the copy operations processed
by On-demand copy are completed.
Pairs are maintained even when all the
copy operations processed by
On-demand copy are completed.
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 = NO,
XTNTLST parameter
specified)
The command withdraws the copy
targets of pairs existing within the
extents specified as the target, provided
that:
• When the copy target of the pair is
only partly included in the extent
specified as the target, 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withdrawn.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 extent specified as the target,
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withdrawn.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
extents specified as the target. When
the copy target of the pair is only partly
included in the extent specified as the
target, the command does not
withdraw the pair.
7 REMOVEFCPY
(ICKDSF CONTROL
command)
The command will finish normally. Pairs
will not be deleted.
Not supported. The command will
finish abnormally. Pairs will not be
deleted.