Designing Disaster Tolerant High Availability Clusters, 10th Edition, March 2003 (B7660-90013)

Environment File Variables for MetroCluster/SRDF
Appendix B414
AUTOR2RWNL Default: 1
AUTOR2WDNL=1 indicates that when the package is
being started on an R2 host, the Symmetrix is in a
Write-disabled state, and the SRDF links are down, the
package will not be started. Since we cannot check the
state of the Symmetrix on the R1 side to validate
conditions, the data on the R2 side may be non-current
and thus a risk that data loss will occur when starting
the package up on the R2 side. To have automatic
package startup under these conditions, set
AUTOR2WDNL=0
AUTOR2WDNL Default: 1
AUTOR2RWNL=1 indicates that when the package is
being started on an R2 host, the Symmetrix is in a
read/write state, and the SRDF links are down, the
package will not be started. Since we cannot check the
state of the Symmetrix on the R1 side to validate
conditions, the data on the R2 side may be non-current
and thus a risk that data loss will occur when starting
the package up on the R2 side. To have automatic
package startup under these conditions, set
AUTOR2RWNL=0
AUTOR2XXNL Default: 0
A value of 0 for this variable indicates that when the
package is being started on an R2 host and at least one
(but not all) SRDF links are down, the package will be
automatically started. This will normally be the case
when the ‘Partitioned+Suspended’ RDF Pairstate
exists. We cannot check the state of all Symmetrix
voumes on the R1 side to validate conditions, but the
Symmetrix on the R2 side should be in a ‘normal’ state.
To require operator intervention before starting the
package under these conditions, set AUTOR2XXNL=1.
AUTOSWAPR2 Default: 0
A value of 0 for this variable indicates that when the
package is failing over to DATA Center 2, the package
will not perform a R1/R2 swap. To have the package