HP XP7 Storage - Manual (Page 103)

5 Feature comparison with IBM product
This chapter describes the differences between IBM FlashCopy and HP Compatible FlashCopy.
Feature comparison with IBM product
The following table shows the differences between IBM FlashCopy and HP Compatible FlashCopy.
Table 57 Differences between IBM FlashCopy and HP Compatible FlashCopy
HP Compatible FlashCopy IBM FlashCopy Compared 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 HP Compatible FlashCopy
The following table shows the maximum number of relationships between IBM FlashCopy and HP
Compatible FlashCopy.
Table 58 Maximum number of relationships between IBM FlashCopy and HP Compatible FlashCopy
HP Compatible FlashCopy IBM FlashCopy Compared 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
65,534 relationships (volume of 10,017
cylinders or more) 50,099 relationships (for 3390-3)
65,534 relationships (except 3390-3)
Maximum number of
relationships that can be
created per volume
20,479 relationships (volume of less than
10,017 cylinders)
Comparison of copying processes
The following table compares the copying processes of IBM FlashCopy and HP Compatible
FlashCopy.
Table 59 Comparison of copying processes
HP Compatible FlashCopy IBM FlashCopy Compared item
Sometimes the data on the tracks subject to read
operation are copied from the copy source to the The data on the tracks subject to read
operation are not copied from the copy
source to the copy target. Read access to the area not
specified as the copy range in
the copy target during the
copy target, and other times the data are not copied
to the target.
background copying process in
NOCOPY mode
Relationships are maintained even when all the copy
operations processed by On-demand copy are
completed. Relationships are withdrawn
automatically when all the copy
operations processed by On-demand
copy are completed. Status of the relationships when
on-demand copy is processed
Not supported. Supported. Establishing relationships by
using the TSO command when
The command will be rejected. The ACTION (FREEZE) option can be
used.
you specify a copy target
volume of PPRC as a source
volume
Even after all of the copy operations processed by
on-demand copy are completed, the Reverse Restore After all of the copy operations
processed by on-demand copy are Reverse Restore
operation cannot be performed on the relationship completed, the Reverse Restore
Feature comparison with IBM product 103