RDF System Management Manual for J-series and H-series RVUs (RDF Update 13)

If an extractor cannot find an audit file it needs because the disk has not yet been mounted, the
extractor abends and the takeover operation aborts. If you have not yet mounted the disk the
extractor needs, you must mount it before reissuing the TAKEOVER command. If the remote mirror
cannot be mounted and you want to do the takeover without the ZLT guarantee, you can alter the
RDF REMOTE MIRROR attribute on the backup system to off. When you reissue the TAKEOVER
command, the takeover then proceeds as a normal takeover operation (without ZLT).
STATUS RDF
You cannot issue the STATUS RDF command from the standby system; it must only be issued from
the backup system.
If a takeover does not involve ZLT, the extractor is not included in the STATUS display during an
RDF takeover operation. With ZLT configured and enabled, the STATUS RDF display changes
during an RDF takeover. During phase 1 (ZLT processing), status is displayed for the extractor(s),
consisting of process name, sno, rba, cpus, error. The RTD field, however, is left blank.
RDFCOM INFO and SHOW Commands
The INFO command output includes the RDF and extractor configuration attributes for ZLT, as does
the output for the SHOW command.
Old Audit-Trail Files
When a ZLT takeover operation completes, you should not purge the old audit trail files on the
remote mirrors connected to the standby system if you believe you can recover the primary system.
The old audit trail files are necessary for recovering the primary system.
If you can’t recover the primary system, you might purge the files because they have no further
use.
Because the old audit trail files are not managed by TMF on the standby system, if you choose to
purge them you must do so manually using Snoop.
Recovering the Primary System After an RDF ZLT Takeover
If you had to execute the RDF takeover operation and you are able to bring your former primary
system back online, you must perform these tasks to recover the database on your former primary
system.
336 Zero Lost Transactions (ZLT)