IBM System storage DS6000 Series Redbook page 130
Copy services with ibm system z
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Also See for System storage DS6000 Series:
- Redbooks (406 pages) ,
- Attachment manual (298 pages) ,
- Introduction and planning manual (119 pages)
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FCESTABL SDEVN(X'3501') TDEVN(X'4501') MODE(NOCOPY2COPY)
FlashCopy to Metro Mirror or Global Copy primary volume
This FlashCopy option allows you to establish a FlashCopy pair where the FlashCopy target
is the primary device in a Metro Mirror (or Global Copy) pair. In this way you can create a
point-in-time copy and then make a copy of that point-in-time copy at a remote site.
Metro
Mirror
or
Global
Copy
Figure 9-15 FlashCopy to Metro Mirror or Global Copy primary
A FlashCopy to a Metro Mirror (or Global Copy) primary configuration is set up as follows
(refer to Figure 9-15):
1. Establish the Metro Mirror pair from the local to the remote site and allow the pair to reach
full duplex state.
2. When you want to make a point-in-time copy of a volume at the local site, establish a
FlashCopy relationship with the primary Metro Mirror volume as the target, specifying
MODE(COPY) and TGTPPRIM(YES) with the FCESTABL command. When the
FlashCopy is requested, the state of the Metro Mirror pair is changed from duplex to
pending.
3. When the background copy on the target FlashCopy volume (which is at the same time
the primary Metro Mirror volume) is complete, the FlashCopy relationship is
ended—unless INCREMENTAL(YES) was specified. Resynchronization of the Metro
Mirror pair begins.
4. When the Metro Mirror pair is resynchronized, the state returns to duplex and the
point-in-time copy is available at the secondary volume at the remote site.
A FlashCopy to a Metro Mirror primary volume can be used with the INCREMENTAL(YES)
option. This results in the Metro Mirror primary using incremental updates to resynchronize
with the Metro Mirror secondary volume.
Inband FlashCopy
The Inband FlashCopy option allows FlashCopy requests to be issued remotely through an
existing remote mirror and copy link—Metro Mirror or Global Copy link.
As shown in Example 9-18 on page 107, the FCESTABL command is issued with the
REMOTE(YES) parameter. Once the FlashCopy is established, the direct host connection
from local to remote DS6000 is not required for a background copy to complete. The host
connection would be needed, however, before any new FlashCopy tasks could be initiated.
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IBM System Storage DS6000 Series: Copy Services with IBM System z
Local site
1
primary
4
target
3
2
source
FlashCopy
Remote site
Metro
Mirror
secondary
or
Global
Copy
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