HP P9000 for Compatible FlashCopy Mirroring User Guide (AV400-96388, October 2011)

5 Feature comparison with IBM product
This chapter describes the difference between IBM FlashCopy and HP Compatible FlashCopy.
Feature comparison with IBM product
The following table lists the differences between IBM FlashCopy and HP Compatible FlashCopy .
Table 57 Differences between IBM FlashCopy and HP compatible FlashCopy
HP Compatible FlashCopyIBM 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 HP Compatible FlashCopy
The following table lists 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 FlashCopyIBM 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)50,099 relationships (for 3390-3)Maximum number of pairs
that can be created per
volume
65,534 relationships (except 3390-3 )
Comparison of process in copying
The following table lists the differences of the copying process between IBM FlashCopy and HP
Compatible FlashCopy.
Table 59 Differences of copying process between IBM FlashCopy and HP compatible FlashCopy
HP compatible FlashCopyIBM FlashCopyCompared 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 copy target, and other times the data are not copied
to the target.the 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Relationships are withdrawn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 pairs when
on-demand copy is
processed
Not supported.Supported.Establishing relationships
by using the TSO command
The command will be rejected.The ACTION (FREEZE) option can be
used.
when you specify a copy
target volume of PPRC as a
source volume
After all the copy operations processed by
on-demand copy are completed, the Reverse Restore
After all the copy operations
processed by on-demand copy are
Reverse Restore
operation cannot be performed on the relationship
created by the Incremental FlashCopy function.
completed, the Reverse Restore
operation can be performed on the
Feature comparison with IBM product 97