HP StorageWorks XP24000 for FlashCopy Mirroring Software User's Guide (T5240-96001, June 2007)

11 Com parison of Versions 1 an d 2
Version 1 and 2 are different regarding the following functions and usage conditions. Since Version
1
and 2 cannot co-exist in the same storage system, choose either one based on the information in
thetablebelow.
Table 43 Differences B et ween Version 1 and Version 2
Compared Item
Version 1 Version 2
Shared memory
No additional shared memory is
required.
Additional shared memory may also
be
necessary.
Requirement
for the
capacity of
the
S-VOL
and
T-VOL fo
ravolume
copy o perat
ion
S-VOL = T-VOL S-VOL ≤ T-VOL
S-VOL / T-VOL LSS
Can create pairs with only volumes in
the sam e LSS.
Can create pairs with volumes in the
same LSS or different LSS.
Range of extents
Can create pairs with the enti re source
and
target volumes or with the copy
source and target extents loca ted at
thesamepositiononthe source and
target volumes.
Can create pairs with the entire source
and
target volumes or with the copy
source and target extents located at
thesameoradifferentpositiononthe
source and target volumes.
Unit use
dfor
relatio
nship
manage
ment
Pairs are managed by volume. Even
when multiple datasets on the same
volume are specified, the number of
the pair is regarded as 1.
Pairs are managed by the specified
extents or by the volume when the
entire volume is specified. When
multiple datasets are specified on
the
same volume, each dataset is
regarded as a relationship.
Number of
relationships created
with a source
One relationship can be created with
one
source volume.
Maximumof16relationships can be
created with one source extent (multi
relationship).
Requirements for
creating relationships
You may specify a ShadowImage for
Mainframevolumeother than Simplex
status
for the copy source, but you
need to specify the Simplex volume
for the copy target (for detai ls, see
Using
Version 1 with ShadowImage
for Mainframe on page 18).
A
ShadowImage for Mainframe S-VOL
that already forms a pair with three
T-VOLs cannot be specified as the
S-VOL of a Version 1 relationship.
You may specify the ShadowImage for
Mainframevolumeother than Simplex
status for the copy source, but you
need
to specify the Simplex volume
for the copy target (for details, see
Using Version 2 with ShadowImage
for Mainframe on page 48).
Up to 16
Ve rsion 2 relationships
can be established by specifying a
ShadowImage for Mainframe S-VOL
that
already forms a pair with three
T-VOLs.
Using with other copy
solutions
Ve
rsion 1 can share the volume with
t
he following program products:
•
S
hadowImage for Mainframe
•
T
rueCopy for Mainframe (only with
M-VOLs)
•
Universal Replicator for Mainframe
•
Concurrent Copy
Ve
rsion2canshare thevolumewith
t
he
following program products:
•
S
hadowImage for Mainframe
•
T
rueCopy for Mainframe (R-VOLs
are also available in some cases)
•
Universal Replicator for Mainframe
•
Concurrent Copy
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