Building Disaster Tolerant Serviceguard Solutions Using Metrocluster with EMC SRDF
Preparing the Cluster for Data Replication
Chapter 5296
Figure 5-6 Sample symrdf list Output from R2 Side
4. Match the logical device numbers in the symrdf listings with the
HP-UX device file names in the output from the syminq command.
This displays which devices are seen from each node to ensure this
node can see all necessary devices.
Use the Symmetrix ID to determine which Symmetrix array is
connected to the node. Then use the Symmetrix device number to
determine which devices are in the same logical device seen by each
node that is connected to the same Symmetrix unit. Record the
HP-UX device file names in your table.
Table 5-2 shows a partial mapping for a 4 node cluster connected to
two Symmetrix arrays (95 and 50). There may be many R1 and R2
devices and many gatekeepers for each package, so this table will be
much larger for most clusters. Also, with M by N configurations, the
number of devices increases according to the number of Symmetrix
frames.
STATUS RDF S T A T E S
000 000 R2:1 NR WD RW SYN DIS OFF 0 0 NR RW Synchronized
Local Device View
Sym RDF -------- ----- --------- R1 Ivn R2 Ivn ---------------
Dev RDev Typ:G SA RA LNK Mode Dom ACp Tracks Tracks Dev RDev Pair
MODES
001 001 R2:1 NR WD RW SYN DIS OFF 0 0 NR RW Synchronized
004 004 R2:1 RW WD RW SYN DIS OFF 0 0 WD RW Synchronized
005 005 R2:1 RW WD RW SYN DIS OFF 0 0 WD RW Synchronized
006 006 R1:2 RW RW RW SYN DIS OFF 0 0 RW WD Synchronized
007 007 R1:2 RW RW RW SYN DIS OFF 0 0 RW WD Synchronized
008 008 R2:1 RW WD RW SYN DIS OFF 0 0 WD RW Synchronized