HP XP24000/XP20000 for FlashCopy Mirroring Software User Guide (T5240-96012, November 2011)

10 Feature Comparison with the IBM Product
This chapter describes the differences between IBM FlashCopy and HP Version 2.
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Feature Comparison with the IBM Product
(page 142) shows the differences between IBM FlashCopy and HP Version 2.
Table 72 Differences Between IBM FlashCopy and Version 2
HP Version 2IBM FlashCopyCompared Item
Not supported.Supported.GLOBAL Mirror status
For details about GLOBAL Mirror
status, see the IBM manual.
Comparison of the Maximum Number of Relationships Between IBM
FlashCopy and Version 2
(page 142) shows the maximum number of relationships between IBM FlashCopy and HP Version
2.
Table 73 Maximum Number of Relationships Between IBM FlashCopy and Version 2
Version 2IBM FlashCopyCompared Item
Up to 16 relationships can be created
per extent (the smallest unit: track).
Up to 12 relationships can be created
per extent (the smallest unit: track).
Number of multiple relationships
1,000 relationships (for all volume
types)
951 relationships (for 3390-3)
2,719 relationships (for 3390-9 when
the number of available cylinders is
10,017)
Maximum number of pairs that can be
created per volume
7,615 relationships (for 3390-L when
the number of available cylinders is
28,356)
8,839 relationships (for 3390-L when
the number of available cylinders is
32,760)
Comparison of Copying Process
(page 142) shows the differences of the copying process for IBM FlashCopy and HP Version 2.
Table 74 Differences of Copying Process Between IBM FlashCopy and Version 2
Version 2IBM FlashCopyCompared Item
Sometimes the data on the tracks
subject to the read operation is copied
The data on the tracks subject to the
read operation is not copied from the
copy source to the copy target.
Read access to an area not specified
as the copy range in the copy target
during the background copying
process in NOCOPY mode
from the copy source to the copy target,
142 Feature Comparison with the IBM Product