RDF System Management Manual for H-Series RVUs (RDF 1.8)

1. Determine which disks (the local disk on the primary system or the remote mirror on the
standby system) for all audit trails in the RDF configuration received the most audit records.
The example that follows shows how to do so for the MAT. If your RDF configuration
includes one or more auxiliary audit trails, you must do the same for each auxiliary audit
trail.
On the ZLT standby system, use SNOOP READAUDIT to read the final file in the MAT,
positioning at EOF and reading in reverse order for one record. This is sample output from
READAUDIT with the MAT position in bold:
* SEQNO = 8, RBA = 107628804, RBN = 26276 *
AC^RECORD^LENGTH=108, AC_VERSION=7, VERSION_FLAGS=000000 000000, PRIMARY^CPU=0
AUDITING^PROCESS=TMP , VSN=000000 000000 000004 077334
TRANSID=000000 000000 000000 000000, ACTTX=0, TYPE=1033 (DATAVOL STATE)
CREATING^SYSTEM=190, VOLNAME=$DATA13, STATE=8, STATE^TEXT=STARTED
On the former primary system, the last file in the MAT might have been left in the crashopen
state. You can determine that by issuing this command:
$system system 3> fileinfo $*.ztmfat.*
$audit.ztmfat
CODE EOF LAST MODIFIED OWNER RWEP PExt SExt
aa000001 134 125825024 01feb2005 10:15 255,255 gggg 3840 3840
aa000002 134 125829120 01feb2005 10:20 255,255 gggg 3840 3840
aa000003 134 125829120 01feb2005 10:24 255,255 gggg 3840 3840
aa000004 134 125808640 01feb2005 10:31 255,255 gggg 3840 3840
aa000005 134 125829120 01feb2005 10:38 255,255 gggg 3840 3840
aa000006 134 125829120 01feb2005 10:45 255,255 gggg 3840 3840
aa000007 134 125829120 01feb2005 10:54 255,255 gggg 3840 3840
aa000008 134 125829120 01feb2005 11:04 255,255 gggg 3840 3840
aa000009 134 125829120 01feb2005 11:14 255,255 gggg 3840 3840
aa000008 ? 134 107630592 01feb2005 11:04 255,255 gggg 3840 3840
The file marked with the question mark must be fixed. Use the SNOOP FIXUPEOF command
to reset the crashopen flag. Then use SNOOP READAUDIT to read the final record. You
cannot use the MERGE option when specifying the name of the audit-trail file. Because the
TMF product is not started, attempting to use the MERGE option results in an error. Using
the example of the MAT above, specify the MAT volume and subvolume when SNOOP
issues this prompt:
Audit trail name or 'MERGE' (MERGE): $AUDIT.ZTMFAT.AA
Compare the MAT position of the two records to determine which disk has the most audit
records.
2. Recover the database on your former primary system. How you do this depends upon
whether local disks or remote mirrors received the most audit records (which you determined
in the preceding step).
If all of the remote mirrors (MAT and all auxiliary audit trails) have more or the same number
of audit records as the local disks (this typically happens if CommitHold was configured
and enabled on the primary system when the outage occurred):
a. Issue SCF STOP $audit-vol on the former primary system (this stops the local disk).
b. Issue SCF STOP $audit-vol on the ZLT standby system (this stops the remote mirror
on the ZLT standby system).
c. Issue SCF START $audit-vol -M (this starts only the remote mirror).
d. Once the remote mirror is started, issue SCF START $audit-vol (which causes the revive
from -M to -P)
Recovering the Primary System After an RDF ZLT Takeover 317