HP XP P9500 Storage - Manual (Page 108)

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 60 Differences between IBM FlashCopy and HP Compatible FlashCopy
HP FC Z 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 61 Maximum number of relationships between IBM FlashCopy and HP Compatible FlashCopy
HP FC Z 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
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 copying processes
The following table compares the copying processes of IBM FlashCopy and HP Compatible
FlashCopy.
Table 62 Comparison of copying processes
HP FC Z IBM FlashCopy Compared item
Sometimes the data on the tracks subject
to read operation are copied from the copy 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 background copying process in
NOCOPY mode
source to the copy target, and other times
the data are not copied to the target.
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 Relationships are withdrawn automatically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 when you specify a copy
target volume of PPRC as a source volume
The command will be rejected. The ACTION (FREEZE) option can be
used.
After all the copy operations processed by
on-demand copy are completed, the After all the copy operations processed
by on-demand copy are completed, the Reverse Restore
Reverse Restore operation cannot be Reverse Restore operation can be
performed on the relationship created by
the Incremental FlashCopy function. performed on the relationship created by
Incremental FlashCopy function.
Regardless of whether differential data
exists, the Reverse Restore operation cannot If differential data does not exist, the
Reverse Restore operation can be
be performed on the relationship after performed on the relationship after
108 Feature comparison with IBM product