Recovering From an EMC Symmetrix Remote Data Facility Data Replication Error

When an error occurs at the data replication level, the error is reflected in the status of the resource in the replication resource group of the relevant device group. This changed status appears in the Data Replication status field in the output of the geoadm status command for that protection group.

This section contains information about the following topics:

• How to Detect Data Replication Errors

• How to Recover From an EMC Symmetrix Remote Data Facility Data Replication Error

How to Detect Data Replication Errors

1. Check the status of the replication resources by using the scstat -g command.

   # clresource status -v sc_geo_dr-SRDF-protectiongroupname-srdf dgname

   For information about how different Resource status values map to actual replication pair states, see Table 2–4.

   Running the clresource status command might return the following:

   … -- Resources -- Resource Name Node Name State Status Message ------------- --------- ----- -------------- Resource: sc_geo_dr-SRDF-srdfpg-devgroup1 pemc1 Online Online - Partitioned Resource: sc_geo_dr-SRDF-srdfpg-devgroup1 pemc2 Offline Offline …

2. Display the aggregate resource status for all device groups in the protection group by using the geoadm status command.

   For example, the output of the clresource status command in the preceding example indicates that the EMC Symmetrix Remote Data Facility device group, devgroup1, is in the Suspended state on cluster-paris. Table 2–4 indicates that the Suspended state corresponds to a resource status of FAULTED. So, the data replication state of the protection group is also FAULTED. This state is reflected in the output of the geoadm status command, which displays the state of the protection group as Error.

   phys-paris-1# geoadm status Cluster: cluster-paris Partnership "paris-newyork-ps" : OK Partner clusters : cluster-newyork Synchronization : OK ICRM Connection : OK Heartbeat "paris-to-newyork" monitoring "cluster-newyork": OK Heartbeat plug-in "ping_plugin" : Inactive Heartbeat plug-in "tcp_udp_plugin" : OK Protection group "srdfpg" : Error Partnership : paris-newyork-ps Synchronization : OK Cluster cluster-paris : Error Role : Primary PG activation state : Activated Configuration : OK Data replication : Error Resource groups : OK Cluster cluster-newyork : Error Role : Secondary PG activation state : Activated Configuration : OK Data replication : Error Resource groups : OK

How to Recover From an EMC Symmetrix Remote Data Facility Data Replication Error

To recover from an error state, you might perform some or all of the steps in the following procedure.

1. Use the procedures in the EMC Symmetrix Remote Data Facility documentation to determine the causes of the FAULTED state.

2. Recover from the faulted state by using the EMC Symmetrix Remote Data Facility procedures.

   If the recovery procedures change the state of the device group, this state is automatically detected by the resource and is reported as a new protection group state.

3. Revalidate the protection group configuration.

   phys-paris-1# geopg validate protectiongroupname

   protectiongroupname

   Specifies the name of the EMC Symmetrix Remote Data Facility protection group

   If the geopg validate command determines if the configuration is valid, the state of the protection group changes to reflect that fact. If the configuration is not valid, geopg validate returns a failure message.

4. Review the status of the protection group configuration.

   phys-paris-1# geopg list protectiongroupname

   protectiongroupname

   Specifies the name of the EMC Symmetrix Remote Data Facility protection group

5. Review the runtime status of the protection group.

   phys-paris-1# geoadm status