Combining truecopy and shadowimage, Table 16 – HP StorageWorks XP Remote Web Console Software User Manual
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Hitachi TrueCopy z/OS for HP XP12000/XP10000 and SVS 200 storage systems
NOTE:
When TC390 and XP Continuous Access coexist in the same XP12000/XP10000, each
consistency group must contain either TC390A pairs or XP Continuous Access Asynchronous pairs
(not both), and TC390A and XP Continuous Access Asynchronous share the same cache sidefile
area.
Combining TC390 and HXRC. The following table shows the requirements and restrictions for combining
TC390 and HXRC operations on the same XP12000/XP10000 device.
Combining TrueCopy and ShadowImage
ShadowImage volumes can be assigned to TC390 pairs, and TC390 volumes can be assigned to
ShadowImage pairs. For further information on ShadowImage for system 390, see the Hitachi
ShadowImage for z/OS user guide.
NOTE:
When TC390 and ShadowImage are both active on the same XP12000/XP10000 subsystem,
TC390 cannot be used to copy within that subsystem. ShadowImage is recommended for
subsystem-internal copy. If ShadowImage is not active, TC390 Synchronous supports intra-subsystem copy
and requires at least one external ESCON cable loop or fibre cable loop.
TC390 and SI390 can be used together in the same disk array and on the same volumes to provide
multiple copies of data at the main and/or remote sites. The following table describes the host pair status
reporting for TC390 volumes, SI390 volumes, and TC390/SI390 shared volumes.
shows the currency of the data on a shared TC390/SI390 volume based on TC390 and SI390 pair status.
•
For shared TC390/SI390 volumes, the TC390 pair status is reported to the host if you query the R-VOL.
To obtain the SI390 pair status, query the target volume (T-VOL) of the pair.
•
SI390 supports multiple target volumes (T-VOLs) for each source volume (S-VOL). If you issue a pair
status query to an SI390 S-VOL (for example, CQUERY), the status for only one SI390 pair is reported
(the pair with the T-VOL with the lowest LDEV ID). To obtain the pair status for the SI390 pair(s) with the
other T-VOL(s), you must direct the host query to the specific T-VOL using the T-VOL’s LDEV ID in the host
command (for example, CQUERY DEVN parameter). SI390 through XP Command View Advanced
Edition Software or XP Remote Web Console displays the LDEV ID and SI390 pair status of all T-VOLs
associated with an S-VOL.
Table 16
Requirements and restrictions for combining TrueCopy and HXRC
Combination
allowed?
TC390
M-VOL
TC390
R-VOL
HXRC
Primary
HXRC
Secondary
TC390 M-VOL
--
No
Yes for TC390 Sync
No for TC390 Async
Yes
TC390 R-VOL
No
--
No
No
HXRC Primary
Yes for TC390 Sync
No for TC390 Async
No
--
Yes
1
1. An XP12000/XP10000 volume that is an HXRC secondary device cannot also be an HXRC primary in the same XRC
session, but it can be an HXRC primary device in another XRC session.
HXRC Secondary
Yes
No
Yes
1
--
Table 17
Host pair status reporting for TrueCopy/ShadowImage shared volumes
Number of
TC390 Pairs
Number of
SI390 T-VOLs
Pair Status Reported by XP12000/XP10000
0
0
Simplex
0
1
SI390 pair status