Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

Replacing the R1 device

1. Wait until the two R2 devices are near synchronization with the R11 device.
2. Shut down any applications writing to the source device.
3. Use the symrdf migrate -replace R1 command to replace the source device.

   

   The symrdf migrate -replace R1 command executes the following actions:

   1. Sets the source device to USR-NR (user not ready).

      This prevents applications writing to or reading from the R1 device.

   2. Verifies the devices are in the correct pair state for replacement.

      See also SRDF pair states for migration.

   3. (If applicable) Waits until all invalid tracks are cleared.
   4. (If applicable) Drains the SRDF/A session.
   5. Removes the SRDF pairing between the devices on the current R11 (Site A) and the original R2 (Site B).
   6. Removes the SRDF pairing between the devices on the current R11 (Site A) and the new R2 (Site C).
   7. Sets an SRDF pairing between the devices on Site C and B using the original SRDF mode of Site A and B. No additional copying of data is required between this SRDF pair because data is already the same on both devices.

      No additional copying of data is required between this SRDF pair because data is already the same on both devices.

   8. Makes the devices read/write on the SRDF links.

   The new R1 device is ready. You can restart the applications writing to the new R1 device on Site C.

   The original R1 device remains USR-NR.