RDF System Management Manual for J-series and H-series RVUs (RDF 1.10)

RDF Configuration Attributes
RDF Remote Mirror Configuration
When declaring the attributes of the RDF configuration record, you use this optional attribute to
specify whether ZLT is enabled or disabled:
SET RDF REMOTE MIRROR [ ON | OFF ]
The default is off. If this attribute is off, normal RDF operations are unchanged, as is execution of
the RDF TAKEOVER command. If this attribute is on, then you must also set other RDF and extractor
attributes, and the TAKEOVER operation has an additional step: connecting the remote mirrors to
the standby system.
RDF Remote Standby Configuration
If you set the RDF REMOTE MIRROR attribute on, you must also set the system name of a standby
system. This standby system can be either a third system, apart from the primary and backup
systems, or it can be the backup system itself. The syntax for specifying the standby system name
is:
SET RDF REMOTE STANDBY node-name
node-name must be a valid name and must identify a system in your current Expand network. If
you set the standby to a different node than your backup system, the specified system must be
accessible to the backup system.
RDF Configuration Record Validation
When you ADD the RDF configuration record, these checks are performed:
• If you set the RDF REMOTE MIRROR attribute on, but did not issue a SET RDF REMOTE
STANDBY command, the ADD command fails.
• If you set the RDF REMOTE MIRROR attribute off and issued a SET RDF REMOTE STANDBY
command, the ADD command fails.
ZLT is only a feature of the RDF/ZLT product: you cannot add the RDF record with ZLT attributes if
you do not have the RDF/ZLT product installed.
NOTE: The hardware configuration for use of a remote mirror on the audit trail is not part of the
RDF configuration, nor is it part of any RDF validation. You must have placed the remote mirror in
a location where you can connect it to the standby system at the time of a takeover. If you fail to
do this, the RDF takeover operation fails until you have connected the remote mirror to the standby
system or turned off remote mirroring. See “ALTER RDF Remote Mirror Configuration” (page 325).
Extractor Audit-Trail Configuration
When configuring RDF for ZLT, you must add the complete set of audit trail volumes to which
RDF-protected data volumes are configured. For example, if your RDF configuration only protects
data volumes configured to the Master Audit Trail (MAT), you must specify all audit trail volumes
that are configured in TMF for the MAT (active, overflow, and restore). Because each audit trail
can have up to 16 active, 16 restore, and 16 overflow volumes, an extractor list can contain up
to 48 volume names. Set each volume name:
SET EXTRACTOR VOLUME volume-name
volume-name must be a valid volume name specified in the current TMF configuration on your
primary system. Use a SET statement for each individual volume. You do not need to specify whether
the volume is an active volume, restore volume, or overflow volume; you merely specify the volume
name. The list of volumes you specify is placed in the extractor configuration record.
324 Zero Lost Transactions (ZLT)