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212 IBM System Storage DS6000 Series: Copy Services with IBM System z
done using an ESS 800 (or ESS 750) as an intermediate unit, because the ESS 800
supports, with PPRC Version 2, both ESCON and FCP links. In this setup, the source
volumes on the ESS F20 would be copied to intermediate volumes on the ESS 800 using
Global Copy (or Metro Mirror), and they in turn would be copied to the target volumes on the
DS6000 using cascading Global Copy. The intermediate ESS has to be at LIC level 2.4.3.65
or later in order to support Global Copy with the DS6000.
A cascaded relationship is established with the second volume pair (intermediate to target). In
TSO, this is done by specifying parameter CASCADE(YES) on the CESTPAIR command, as
shown in Example 18-5. In the example, device 4C80 is the intermediate volume.
Example 18-5 Cascading with TSO
CESTPAIR DEVN(X’4C80’) OPTION(XD) MODE(COPY) CASCADE(YES) -
LSS(X’01’,X’05’) -
PRI(X’2901’ FCA29 X’00’ X’01’) SEC(X’2805’ FCA28 X’00’ X’05’)
The respective parameter for the ICKDSF ESTPAIR command is CASCADE; see
Example 18-6.
Example 18-6 Cascading with ICKDSF
PPRCOPY ESTPAIR UNIT(4C80) OPTION(XD) MODE(COPY) CASCADE -
LSS(X’01’,X’05’) -
PRI(X’2901’,FCA29,X’00’) SEC(X’2805’,FCA28,X’00’)
In DS CLI, a cascading relationship is established by specifying parameter -cascade for the
mkpprc command, as shown in Example 18-7.
Example 18-7 Cascading with CLI
mkpprc -dev ibm.2105-22399 remotedev ibm.1750-1300247 -type gcp -mode full -cascade
050a:023a
Date/Time: November 25, 2005 10:28:17 AM EET IBM DSCLI Version: 5.1.0.204 DS:
IBM.2105-22399
CMUC00153I mkpprc: Remote Mirror and Copy volume pair relationship 050A:023A successfully
created.
lspprc -dev ibm.2105-22399 050a
Date/Time: November 25, 2005 10:28:42 AM EET IBM DSCLI Version: 5.1.0.204 DS:
IBM.2105-22399
ID State Reason Type SourceLSS Timeout (secs) Critical Mode Fir
===========================================================================================
011A:050A Target Copy Pending - Global Copy 01 unknown Disabled
050A:023A Copy Pending - Global Copy 05 unknown Disabled
In the example, 011A is the source volume, 050A is the intermediate volume, and 023A is the
target volume. The lspprc command shows the status of both volume pairs where the
intermediate volume 050A belongs. 011A:050A is the first pair where 050A is the secondary,
and 050A:023A is the second pair where 050A is the cascading primary.
Note that ESS F20 does not support DS CLI. The Global Copy relationships between the
ESS F20 and the ESS 800 can be managed using, for example, TSO. The relationships
between the ESS 800 and the DS6000 can also be managed using the DS CLI.