SRDF Pair Status

Posted by Diwakar ADD COMMENTS

SRDF/S and SRDF/A configuration involves tasks such as suspending and resuming the replication, failover from R1 side to R2, restoring R1 or R2 volumes from their BCV, and more. You perform these and other SRDF/S or SRDF/A operations using both symrdf and TimeFinder command symmir. The below details are for SRDF Pair states during SRDF procedure.

SyncInProg :- A synchronization is currently in progress between the R1 and the R2. There are existing invalid tracks between the two pairs and the logical link between both sides of an RDF pair is up.

Synchronized :- The R1 and the R2 are currently in a synchronized state. The same content exists on the R2 as the R1. There are no invalid tracks between the two pairs.

Split :- The R1 and the R2 are currently Ready to their hosts, but the link is Not Ready or Write Disabled.

Failed Over :- The R1 is currently Not Ready or Write Disabled and operations been failed over to the R2.

R1 Updated :- The R1 is currently Not Ready or Write Disabled to the host, there are no local invalid tracks on the R1 side, and the link is Ready or Write Disabled.

R1 UpdInProg :- The R1 is currently Not Ready or Write Disabled to the host, there are invalid local (R1) tracks on the source side, and the link is Ready or Write Disabled.
Suspended :- The RDF links have been suspended and are Not Ready or Write Disabled. If the R1 is Ready while the links are suspended, any I/O accumulates as invalid tracks owed to the R2.

Partitioned :- The SYMAPI is currently unable to communicate through the corresponding RDF path to the remote Symmetrix. Partitioned may apply to devices within an RA group. For example, if SYMAPI is unable to communicate to a remote Symmetrix via an RA group, devices in that RA group are marked as being in the Partitioned state.

Mixed :- Mixed is a composite SYMAPI device group RDF pair state. Different SRDF pair states exist within a device group.

Invalid :- This is the default state when no other SRDF state applies. The combination of R1, R2, and RDF link states and statuses do not match any other pair state. This state may occur if there is a problem at the disk director level.

Consistent :- The R2 SRDF/A capable devices are in a consistent state. Consistent state signifies the normal state of operation for device pairs operating in asynchronous mode.

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Sr. Solutions Architect; Expertise: - Cloud Design & Architect - Data Center Consolidation - DC/Storage Virtualization - Technology Refresh - Data Migration - SAN Refresh - Data Center Architecture More info:- diwakar@emcstorageinfo.com
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