HP XP Business Copy Software - Manual (Page 168)

168 ShadowImage for the XP1024/XP128/XP12000/XP10000/SVS 200
Differences Between IBM FlashCopy and Compatible Mirroring for IBM FlashCopy
Version 2
13 TSO command
FCWITHDR
DDSW parameter Pairs are withdrawn regardless of
whether the copy operation is set to
COPY or NOCOPY mode.
The DDSW parameter is not supported.
When DDSW = YES: Pairs created with
the extents on the device specified by
SDEVN are withdrawn. When the
pairs created with the source extents
which copy mode is set to COPY, the
pairs are withdrawn after the
background copy is completed.
When the pairs created with the source
extents which copy mode is set to
NOCOPY, the pairs are not withdrawn
until switch the copy mode to COPY
and complete the background copy.
Pairs established with the copy target
extents are withdrawn immediately.
When DDSW = NO: The pairs created
with the extents on the device specified
by TDEVN are withdrawn immediately.
14 TSO command
FCWITHDR
XTNTLST parameter Not supported. Can withdraw pairs created with
extents located at different positions.
15 Items displayed by
FCQUERY command
Whether the volume status is simplex or
not.
Whether any FlashCopy Mirror pairs
are created or not.
Rate of progress (%) of background
copy.
Number of active pairs.
Maximum number of pairs that can be
created with the device specified by
DEVN.
16 ICKDSF command Not supported. Partly supported.
Table 77 Differences Between FlashCopy Mirror and FlashCopy Mirror Version 2 (continued)
No. Compared item FlashCopy Mirror FlashCopy Mirror Version 2
Table 78 Differences Between IBM FlashCopy and Compatible Mirroring for IBM FlashCopy Version 2
No. Compared item IBM FlashCopy FlashCopy Mirror Version 2
1 Read access to the
area not specified as
the copy range in the
copy target in
NOCOPY mode
The data on the tracks subject to read
operation are not copied from the copy
source to the copy target.
Sometimes the data on the tracks
subject to read operation are copied
from the copy source to the copy target,
and other times the data are not copied
to the target.
2 Status of the pairs
when On-demand
copy is processed
Pairs are withdrawn automatically
when all the copy operations processed
by On-demand copy are completed.
Pairs are maintained even when all the
copy operations processed by
On-demand copy are completed.