Designing Disaster Recovery Clusters using Metroclusters and Continentalclusters, Reprinted October 2011 (5900-1881)

019C 0018 R1:5 RW RW RW S.. 0 0 RW WD Synchronized
019D 0019 R1:5 RW RW RW S.. 0 0 RW WD Synchronized
2. Create an RDF1 type device group. For example, the group name AsynDG.
On R1 side:
# symdg create AsynDG -type RDF1
On R2 side:
# symdg create AsynDG -type RDF2
3. All devices from the RDF (RA) group configuration are added to the device group for
SRDF/Asynchronous operation. For example, if the RDF group displayed in the symrdf list
display is group number 5, then all devices in this RDF group must be managed together
within one device group for SRDF/Asynchronous operation.
# symld -g AsynDG addall -rdfg 5
4. Repeat the steps 1-3 on each host that need to run Serviceguard packages.
5. Query the device group to display the R1-to-R2 setup and the state of the SRDF/Asynchronous
device pairs.
# symld -g AsynDG query -rdfa
Sample output from the command:
Source (R1) View Target (R2) View MODES
-------------------------------- ------------------------ ----- ------------
ST LI ST
Standard A N A
Logical T R1 Inv R2 Inv K T R1 Inv R2 Inv RDF Pair
Device Dev E Tracks Tracks S Dev E Tracks Tracks MDAC STATE
-------------------------------- -- ------------------------ ----- ------------
DEV001 0196 RW 0 0 RW 0012 WD 0 0 S... Synchronized
DEV002 0197 RW 0 0 RW 0013 WD 0 0 S... Synchronized
DEV003 0198 RW 0 0 RW 0014 WD 0 0 S... Synchronized
DEV004 0199 RW 0 0 RW 0015 WD 0 0 S... Synchronized
DEV005 019A RW 0 0 RW 0016 WD 0 0 S... Synchronized
DEV006 019B RW 0 0 RW 0017 WD 0 0 S... Synchronized
DEV007 019C RW 0 0 RW 0018 WD 0 0 S... Synchronized
DEV008 019D RW 0 0 RW 0019 WD 0 0 S... Synchronized
6. Set the device group to Asynchronous mode:
# symrdf -g AsynDG set mode async
7. Consistency protection must be enabled to ensure the data consistency on R2 side for the
SRDF/Asynchronous devices in the device group.
# symrdf -g AsynDG enable
8. If the SRDF pairs are not in a Consistent state at this point, initiate an establish command
to synchronize the data on the R2 side from the R1 side. The device state will be SyncInProg
until the Consistent status is reached.
# symrdf -g AsynDG establish
Sample output after the RDF pairs have been established:
Source (R1) View Target (R2) View MODES
---------------------- ---------------------- -----
ST LI ST
Standard A N A
Logical T R1 Inv R2 Inv K T R1 Inv R2 Inv RDF Pair
Device Dev E Tracks Tracks S Dev E Tracks Tracks MDAC STATE
------------- -- ------------------------ ----- ------------
DEV001 0196 RW 0 0 RW 0012 WD 0 0 A..X Consistent
DEV002 0197 RW 0 0 RW 0013 WD 0 0 A..X Consistent
DEV003 0198 RW 0 0 RW 0014 WD 0 0 A..X Consistent
DEV004 0199 RW 0 0 RW 0015 WD 0 0 A..X Consistent
DEV005 019A RW 0 0 RW 0016 WD 0 0 A..X Consistent
DEV006 019B RW 0 0 RW 0017 WD 0 0 A..X Consistent
Configuring Metrocluster with EMC SRDF using SRDF/Asynchronous 293