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

Physical Data Replication for ContinentalClusters Using EMC SRDF
Preparing a Continental Cluster for Data Replication
Chapter 7330
In this example, the target and LUN numbers do not always match
for all hosts on the same side of the SRDF link. For ease of
administration, it is recommended that all hosts use the same target
and LUN number when referring to the same Symmetrix logical
device.
You will probably need to refer to the actual Symmetrix
configuration (available from the Symmetrix console or by using the
Symmetrix Manager for Open Systems) to definitively match up the
R1 devices in one Symmetrix unit with the R2 devices in the other
Symmetrix unit.
This table will be useful when you complete Step 8 below. It will
allow you to easily (and correctly) specify the device file names when
creating the Symmetrix device groups.
Note that the Symmetrix device number may be the same or
different each of the Symmetrix units for the same logical device. In
other words, the device number for the logical device on the R1 side
of the SRDF link may be different from the device ID for the logical
device on the R2 side of the SRDF link.
When you are determining the configuration for the Symmetrix
devices for a new installation, it is recommended that you try to use
the same Symmetrix device number for the R1 devices and the R2
devices. It is also recommended that the same target and LUN
number be configured for all hosts that have access to the same
Symmetrix logical device.
Dev# 041 c5t15d1
Type GK
ID 95 c1t1d0
Dev# 028 c6t1d0
Type BCV n/a n/a
Table 7-1 Symmetrix Device and HP-UX Device Correlation (Continued)
Symmetrix
ID, device
#, and type
Node 1
/dev/rdsk
device file
name
Node 2
/dev/rdsk
device file
name
Node 3
/dev/rdsk
device file
name
Nodes 4
/dev/rdsk
device file
name